Skip to content

Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379

Open
Open
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
Assignees
rongxin-liu
Labels
CS50xCS50xbugSomething isn't working

Description

@ivanharvard
ivanharvard
opened on Sep 14, 2025

Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:

:) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of ""

This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:

output= [lineforlineinoutput.splitlines() ifline!=""]

which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.

Metadata

Metadata

Assignees

Labels

CS50xCS50xbugSomething isn't working

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)) { // Add copy buttons to all 
     blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 · Issue #379 · cs50/problems · GitHub
    Skip to content
    Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379
    Open
    Open
    Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
    Assignees
    rongxin-liu
    Labels
    CS50xCS50xbugSomething isn't working
    Description
    @ivanharvard
    ivanharvard
    opened on Sep 14, 2025
    Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:
    :) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of "" 
    This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:
    output= [lineforlineinoutput.splitlines() ifline!=""]
    which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.
    Metadata
    Metadata
    Assignees
    Labels
    CS50xCS50xbugSomething isn't working
    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)) {
// 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('^' + ".*" + '
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 · Issue #379 · cs50/problems · GitHub
      Skip to content
      Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379
      Open
      Open
      Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
      Assignees
      rongxin-liu
      Labels
      CS50xCS50xbugSomething isn't working
      Description
      @ivanharvard
      ivanharvard
      opened on Sep 14, 2025
      Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:
      :) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of "" 
      This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:
      output= [lineforlineinoutput.splitlines() ifline!=""]
      which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.
      Metadata
      Metadata
      Assignees
      Labels
      CS50xCS50xbugSomething isn't working
      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('^' + ".*" + '
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 · Issue #379 · cs50/problems · GitHub
        Skip to content
        Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379
        Open
        Open
        Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
        Assignees
        rongxin-liu
        Labels
        CS50xCS50xbugSomething isn't working
        Description
        @ivanharvard
        ivanharvard
        opened on Sep 14, 2025
        Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:
        :) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of "" 
        This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:
        output= [lineforlineinoutput.splitlines() ifline!=""]
        which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.
        Metadata
        Metadata
        Assignees
        Labels
        CS50xCS50xbugSomething isn't working
        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)) {
// 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" + '
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 · Issue #379 · cs50/problems · GitHub
          Skip to content
          Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379
          Open
          Open
          Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
          Assignees
          rongxin-liu
          Labels
          CS50xCS50xbugSomething isn't working
          Description
          @ivanharvard
          ivanharvard
          opened on Sep 14, 2025
          Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:
          :) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of "" 
          This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:
          output= [lineforlineinoutput.splitlines() ifline!=""]
          which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.
          Metadata
          Metadata
          Assignees
          Labels
          CS50xCS50xbugSomething isn't working
          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('^' + ".*" + '
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 · Issue #379 · cs50/problems · GitHub
            Skip to content
            Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379
            Open
            Open
            Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
            Assignees
            rongxin-liu
            Labels
            CS50xCS50xbugSomething isn't working
            Description
            @ivanharvard
            ivanharvard
            opened on Sep 14, 2025
            Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:
            :) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of "" 
            This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:
            output= [lineforlineinoutput.splitlines() ifline!=""]
            which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.
            Metadata
            Metadata
            Assignees
            Labels
            CS50xCS50xbugSomething isn't working
            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('^' + ".*" + '
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 · Issue #379 · cs50/problems · GitHub
              Skip to content
              Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379
              Open
              Open
              Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
              Assignees
              rongxin-liu
              Labels
              CS50xCS50xbugSomething isn't working
              Description
              @ivanharvard
              ivanharvard
              opened on Sep 14, 2025
              Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:
              :) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of "" 
              This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:
              output= [lineforlineinoutput.splitlines() ifline!=""]
              which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.
              Metadata
              Metadata
              Assignees
              Labels
              CS50xCS50xbugSomething isn't working
              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); }
})();
})();
Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 · Issue #379 · cs50/problems · GitHub
                Skip to content
                Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0 #379
                Open
                Open
                Empty new lines cause unhelpful/untrue diff in Mario in v4.0.0#379
                Assignees
                rongxin-liu
                Labels
                CS50xCS50xbugSomething isn't working
                Description
                @ivanharvard
                ivanharvard
                opened on Sep 14, 2025
                Printing any arbitrary amount of new lines at the end of the staff solution for Mario causes this error message:
                :) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) rejects a height of 0
:( handles a height of 1 correctly
expected: "# #"
actual: "# #"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 2 correctly
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:( handles a height of 8 correctly
 expected: "...#####" actual: "...#####"
did you add too much trailing whitespace to the end of your pyramid?
:( rejects a height of -1, and then accepts a height of 2
 expected: "...# ##" actual: "...# ##"
did you add too much trailing whitespace to the end of your pyramid?
:) rejects a non-numeric height of "foo" :) rejects a non-numeric height of "" 
                This is probably because of this line under check_pyramids() in problems/mario/less/__init__.py:
                output= [lineforlineinoutput.splitlines() ifline!=""]
                which removes all empty lines, including new lines, from the user's output, thus causing the diff to show equivalent expected and actual answers.
                Metadata
                Metadata
                Assignees
                Labels
                CS50xCS50xbugSomething isn't working
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions