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Unable to interactively see matplotlib plots with QtAgg backend #858

Description

Environment data

  • debugpy version: 1.5.1
  • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
  • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
  • matplotlib
Name Version Build Channel
matplotlib 3.4.2 pypi_0 pypi
matplotlib-base 3.5.1 py39h581301d_0 conda-forge
matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge

The matplotlib settings are:

backend QtAgg interactive True non interactive False
  • Using VS Code or Visual Studio: 1.64.2

Actual behavior

I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

Expected behavior

The figure does not update when stepping through code.

Steps to reproduce:

  1. Create a python script test.py with the following code:
import matplotlib.pyplot as plt
figure = plt.figure()
ax = plt.gca()
ax.plot([1,2,3])
ax.set_title("hello")
plt.show()
  1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
  2. The figure appears blank and doesn't update.

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    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all
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    function addCopyButtons() {
    document.querySelectorAll('pre code').forEach(function(codeBlock) {
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    btn.textContent = 'Copy';
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    observer.observe(document.body, { childList: true, subtree: true });
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    } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
    })();
    (function(){
    try {
    var __m = "github.com";
    var __re = new RegExp('^' + "github\\.com" + '
    Unable to interactively see matplotlib plots with `QtAgg` backend · Issue #858 · microsoft/debugpy · GitHub
    Skip to content

    Unable to interactively see matplotlib plots with QtAgg backend #858

    Description

    Environment data

    • debugpy version: 1.5.1
    • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
    • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
    • matplotlib
    Name Version Build Channel
    matplotlib 3.4.2 pypi_0 pypi
    matplotlib-base 3.5.1 py39h581301d_0 conda-forge
    matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge
    

    The matplotlib settings are:

    backend QtAgg interactive True non interactive False
    
    • Using VS Code or Visual Studio: 1.64.2

    Actual behavior

    I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

    Expected behavior

    The figure does not update when stepping through code.

    Steps to reproduce:

    1. Create a python script test.py with the following code:
    import matplotlib.pyplot as plt
    figure = plt.figure()
    ax = plt.gca()
    ax.plot([1,2,3])
    ax.set_title("hello")
    plt.show()
    
    1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
    2. The figure appears blank and doesn't update.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Unable to interactively see matplotlib plots with `QtAgg` backend · Issue #858 · microsoft/debugpy · GitHub
      Skip to content

      Unable to interactively see matplotlib plots with QtAgg backend #858

      Description

      Environment data

      • debugpy version: 1.5.1
      • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
      • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
      • matplotlib
      Name Version Build Channel
      matplotlib 3.4.2 pypi_0 pypi
      matplotlib-base 3.5.1 py39h581301d_0 conda-forge
      matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge
      

      The matplotlib settings are:

      backend QtAgg interactive True non interactive False
      
      • Using VS Code or Visual Studio: 1.64.2

      Actual behavior

      I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

      Expected behavior

      The figure does not update when stepping through code.

      Steps to reproduce:

      1. Create a python script test.py with the following code:
      import matplotlib.pyplot as plt
      figure = plt.figure()
      ax = plt.gca()
      ax.plot([1,2,3])
      ax.set_title("hello")
      plt.show()
      
      1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
      2. The figure appears blank and doesn't update.

      Metadata

      Metadata

      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)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Unable to interactively see matplotlib plots with `QtAgg` backend · Issue #858 · microsoft/debugpy · GitHub
        Skip to content

        Unable to interactively see matplotlib plots with QtAgg backend #858

        Description

        Environment data

        • debugpy version: 1.5.1
        • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
        • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
        • matplotlib
        Name Version Build Channel
        matplotlib 3.4.2 pypi_0 pypi
        matplotlib-base 3.5.1 py39h581301d_0 conda-forge
        matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge
        

        The matplotlib settings are:

        backend QtAgg interactive True non interactive False
        
        • Using VS Code or Visual Studio: 1.64.2

        Actual behavior

        I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

        Expected behavior

        The figure does not update when stepping through code.

        Steps to reproduce:

        1. Create a python script test.py with the following code:
        import matplotlib.pyplot as plt
        figure = plt.figure()
        ax = plt.gca()
        ax.plot([1,2,3])
        ax.set_title("hello")
        plt.show()
        
        1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
        2. The figure appears blank and doesn't update.

        Metadata

        Metadata

        Labels

        Type

        No type

        Projects

        No projects

          Milestone

          No milestone

          Relationships

          None yet

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          No branches or pull requests

          Issue actions

          , 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' Unable to interactively see matplotlib plots with `QtAgg` backend · Issue #858 · microsoft/debugpy · GitHub
          Skip to content

          Unable to interactively see matplotlib plots with QtAgg backend #858

          Description

          Environment data

          • debugpy version: 1.5.1
          • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
          • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
          • matplotlib
          Name Version Build Channel
          matplotlib 3.4.2 pypi_0 pypi
          matplotlib-base 3.5.1 py39h581301d_0 conda-forge
          matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge
          

          The matplotlib settings are:

          backend QtAgg interactive True non interactive False
          
          • Using VS Code or Visual Studio: 1.64.2

          Actual behavior

          I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

          Expected behavior

          The figure does not update when stepping through code.

          Steps to reproduce:

          1. Create a python script test.py with the following code:
          import matplotlib.pyplot as plt
          figure = plt.figure()
          ax = plt.gca()
          ax.plot([1,2,3])
          ax.set_title("hello")
          plt.show()
          
          1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
          2. The figure appears blank and doesn't update.

          Metadata

          Metadata

          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)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Unable to interactively see matplotlib plots with `QtAgg` backend · Issue #858 · microsoft/debugpy · GitHub
            Skip to content

            Unable to interactively see matplotlib plots with QtAgg backend #858

            Description

            Environment data

            • debugpy version: 1.5.1
            • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
            • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
            • matplotlib
            Name Version Build Channel
            matplotlib 3.4.2 pypi_0 pypi
            matplotlib-base 3.5.1 py39h581301d_0 conda-forge
            matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge
            

            The matplotlib settings are:

            backend QtAgg interactive True non interactive False
            
            • Using VS Code or Visual Studio: 1.64.2

            Actual behavior

            I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

            Expected behavior

            The figure does not update when stepping through code.

            Steps to reproduce:

            1. Create a python script test.py with the following code:
            import matplotlib.pyplot as plt
            figure = plt.figure()
            ax = plt.gca()
            ax.plot([1,2,3])
            ax.set_title("hello")
            plt.show()
            
            1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
            2. The figure appears blank and doesn't update.

            Metadata

            Metadata

            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)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Unable to interactively see matplotlib plots with `QtAgg` backend · Issue #858 · microsoft/debugpy · GitHub
              Skip to content

              Unable to interactively see matplotlib plots with QtAgg backend #858

              Description

              Environment data

              • debugpy version: 1.5.1
              • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
              • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
              • matplotlib
              Name Version Build Channel
              matplotlib 3.4.2 pypi_0 pypi
              matplotlib-base 3.5.1 py39h581301d_0 conda-forge
              matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge
              

              The matplotlib settings are:

              backend QtAgg interactive True non interactive False
              
              • Using VS Code or Visual Studio: 1.64.2

              Actual behavior

              I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

              Expected behavior

              The figure does not update when stepping through code.

              Steps to reproduce:

              1. Create a python script test.py with the following code:
              import matplotlib.pyplot as plt
              figure = plt.figure()
              ax = plt.gca()
              ax.plot([1,2,3])
              ax.set_title("hello")
              plt.show()
              
              1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
              2. The figure appears blank and doesn't update.

              Metadata

              Metadata

              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)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); Unable to interactively see matplotlib plots with `QtAgg` backend · Issue #858 · microsoft/debugpy · GitHub
                Skip to content

                Unable to interactively see matplotlib plots with QtAgg backend #858

                Description

                Environment data

                • debugpy version: 1.5.1
                • OS and version: Windows 10 Pro 21H2 (64-bit) 10.0.19044
                • Python version (& distribution if applicable, e.g. Anaconda): 3.9.4
                • matplotlib
                Name Version Build Channel
                matplotlib 3.4.2 pypi_0 pypi
                matplotlib-base 3.5.1 py39h581301d_0 conda-forge
                matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge
                

                The matplotlib settings are:

                backend QtAgg interactive True non interactive False
                
                • Using VS Code or Visual Studio: 1.64.2

                Actual behavior

                I would like to be able to debug python scripts that use matplotlib interactively. By interactively I mean placing a break point and watching my figure update as I actually step through my code.

                Expected behavior

                The figure does not update when stepping through code.

                Steps to reproduce:

                1. Create a python script test.py with the following code:
                import matplotlib.pyplot as plt
                figure = plt.figure()
                ax = plt.gca()
                ax.plot([1,2,3])
                ax.set_title("hello")
                plt.show()
                
                1. Place a breakpoint on line 4 and then step through the following lines of code one by one.
                2. The figure appears blank and doesn't update.

                Metadata

                Metadata

                Labels

                Type

                No type

                Projects

                No projects

                  Milestone

                  No milestone

                  Relationships

                  None yet

                  Development

                  No branches or pull requests

                  Issue actions