Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8

Closed
#10
Closed
Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
#10
Assignees
AbhiPrasad

Description

@setuc
Setu Chokshi (setuc)
opened on Feb 24, 2026

Bug Report

SDK version: braintrust 0.5.6
Python version: 3.14.2
Platform: macOS (darwin aarch64)

Description

When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.

This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.

Reproduction

importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here

Error

File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

Root Cause

In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:

ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned

When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.

Fix

Add merged_git_metadata_settings = None before the if/else block:

merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...

Workaround

We patched the SDK source directly:

sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py

Impact

This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.

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    , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
     blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8
    Closed
    #10
    Closed
    Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
    #10
    Assignees
    AbhiPrasad
    Description
    @setuc
    Setu Chokshi (setuc)
    opened on Feb 24, 2026
    Bug Report
    SDK version: braintrust 0.5.6
    Python version: 3.14.2
    Platform: macOS (darwin aarch64)
    Description
    When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.
    This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.
    Reproduction
    importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here
    Error
    File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

    Root Cause
    In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:
    ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned
    When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.
    Fix
    Add merged_git_metadata_settings = None before the if/else block:
    merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...
    Workaround
    We patched the SDK source directly:
    sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py
    Impact
    This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.
    Metadata
    Metadata
    Assignees
    Labels
    No labels
    No labels
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    No type
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      Milestone
      No milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8
      Closed
      #10
      Closed
      Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
      #10
      Assignees
      AbhiPrasad
      Description
      @setuc
      Setu Chokshi (setuc)
      opened on Feb 24, 2026
      Bug Report
      SDK version: braintrust 0.5.6
      Python version: 3.14.2
      Platform: macOS (darwin aarch64)
      Description
      When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.
      This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.
      Reproduction
      importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here
      Error
      File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

      Root Cause
      In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:
      ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned
      When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.
      Fix
      Add merged_git_metadata_settings = None before the if/else block:
      merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...
      Workaround
      We patched the SDK source directly:
      sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py
      Impact
      This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.
      Metadata
      Metadata
      Assignees
      Labels
      No labels
      No labels
      Type
      No type
      Projects
      No projects
        Milestone
        No milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8
        Closed
        #10
        Closed
        Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
        #10
        Assignees
        AbhiPrasad
        Description
        @setuc
        Setu Chokshi (setuc)
        opened on Feb 24, 2026
        Bug Report
        SDK version: braintrust 0.5.6
        Python version: 3.14.2
        Platform: macOS (darwin aarch64)
        Description
        When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.
        This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.
        Reproduction
        importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here
        Error
        File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

        Root Cause
        In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:
        ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned
        When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.
        Fix
        Add merged_git_metadata_settings = None before the if/else block:
        merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...
        Workaround
        We patched the SDK source directly:
        sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py
        Impact
        This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.
        Metadata
        Metadata
        Assignees
        Labels
        No labels
        No labels
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8
          Closed
          #10
          Closed
          Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
          #10
          Assignees
          AbhiPrasad
          Description
          @setuc
          Setu Chokshi (setuc)
          opened on Feb 24, 2026
          Bug Report
          SDK version: braintrust 0.5.6
          Python version: 3.14.2
          Platform: macOS (darwin aarch64)
          Description
          When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.
          This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.
          Reproduction
          importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here
          Error
          File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

          Root Cause
          In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:
          ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned
          When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.
          Fix
          Add merged_git_metadata_settings = None before the if/else block:
          merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...
          Workaround
          We patched the SDK source directly:
          sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py
          Impact
          This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.
          Metadata
          Metadata
          Assignees
          Labels
          No labels
          No labels
          Type
          No type
          Projects
          No projects
            Milestone
            No milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8
            Closed
            #10
            Closed
            Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
            #10
            Assignees
            AbhiPrasad
            Description
            @setuc
            Setu Chokshi (setuc)
            opened on Feb 24, 2026
            Bug Report
            SDK version: braintrust 0.5.6
            Python version: 3.14.2
            Platform: macOS (darwin aarch64)
            Description
            When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.
            This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.
            Reproduction
            importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here
            Error
            File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

            Root Cause
            In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:
            ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned
            When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.
            Fix
            Add merged_git_metadata_settings = None before the if/else block:
            merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...
            Workaround
            We patched the SDK source directly:
            sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py
            Impact
            This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8
              Closed
              #10
              Closed
              Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
              #10
              Assignees
              AbhiPrasad
              Description
              @setuc
              Setu Chokshi (setuc)
              opened on Feb 24, 2026
              Bug Report
              SDK version: braintrust 0.5.6
              Python version: 3.14.2
              Platform: macOS (darwin aarch64)
              Description
              When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.
              This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.
              Reproduction
              importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here
              Error
              File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

              Root Cause
              In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:
              ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned
              When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.
              Fix
              Add merged_git_metadata_settings = None before the if/else block:
              merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...
              Workaround
              We patched the SDK source directly:
              sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py
              Impact
              This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.
              Metadata
              Metadata
              Assignees
              Labels
              No labels
              No labels
              Type
              No type
              Projects
              No projects
                Milestone
                No milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                Skip to content
                Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided #8
                Closed
                #10
                Closed
                Python 3.14: UnboundLocalError in compute_metadata when repo_info is provided#8
                #10
                Assignees
                AbhiPrasad
                Description
                @setuc
                Setu Chokshi (setuc)
                opened on Feb 24, 2026
                Bug Report
                SDK version: braintrust 0.5.6
                Python version: 3.14.2
                Platform: macOS (darwin aarch64)
                Description
                When using braintrust.init() with repo_info and git_metadata_settings=GitMetadataSettings(collect="none"), the SDK crashes with UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' during lazy experiment ID resolution.
                This is a Python 3.14 scoping change as Python 3.14 enforces stricter scoping for variables defined only inside one branch of an if/else block.
                Reproduction
                importbraintrustfrombraintrust.git_fieldsimportRepoInfobraintrust.login(api_key="<key>", force_login=True)
repo_info=RepoInfo(commit="abc123", branch="main", dirty=False, author_name="test")
exp=braintrust.init(
project="my_project",
experiment="test_experiment",
repo_info=repo_info,
git_metadata_settings=braintrust.GitMetadataSettings(collect="none"),
)
exp.log(input={"test": "hello"}, output="world", scores={"accuracy": 1.0})
exp.flush() # Crashes here
                Error
                File "braintrust/logger.py", line 1659, in compute_metadata
elif merged_git_metadata_settings and merged_git_metadata_settings.collect != "none":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'merged_git_metadata_settings' where it is not associated with a value

                Root Cause
                In logger.py around line 1642-1660, merged_git_metadata_settings is only assigned inside the else branch:
                ifrepo_info: # line 1642repo_info_arg=repo_info# line 1643 — skips assignmentelse:
merged_git_metadata_settings=state.git_metadata_settings# line 1645 — only here
...
# Later:elifmerged_git_metadata_settingsand ...: # line 1659 — BOOM: variable never assigned
                When repo_info is truthy (which it always is when you pass it), the else block never executes, so merged_git_metadata_settings is never assigned. Python 3.14 raises UnboundLocalError because the variable is referenced in a branch that's unreachable given the control flow.
                Fix
                Add merged_git_metadata_settings = None before the if/else block:
                merged_git_metadata_settings=None# Ensure variable exists in all code pathsifrepo_info:
repo_info_arg=repo_infoelse:
merged_git_metadata_settings=state.git_metadata_settings
...
                Workaround
                We patched the SDK source directly:
                sed -i '''s/ if repo_info:/ merged_git_metadata_settings = None\n if repo_info:/' .venv/lib/python3.14/site-packages/braintrust/logger.py
                Impact
                This blocks all experiment logging on Python 3.14. Project logging (traces) works fine — only experiments are affected because they use the lazy compute_metadata path.
                Metadata
                Metadata
                Assignees
                Labels
                No labels
                No labels
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions