Hykilpikonna
204 lines
9.0 KiB
HTML
204 lines
9.0 KiB
HTML
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<header id="title-block-header">
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<h1 class="title">B.5 <code>pdb</code> (Python Debugger)</h1>
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</header>
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<section>
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<p><em>Adapted from <a href="https://docs.python.org/3/library/pdb.html" class="uri">https://docs.python.org/3/library/pdb.html</a>.</em></p>
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<p>The module <code>pdb</code> defines an interactive source code debugger for Python programs.</p>
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<p>The typical usage to break into the debugger from a running program is to insert</p>
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<div class="sourceCode" id="cb1"><pre class="sourceCode python"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1"></a><span class="bu">breakpoint</span>()</span></code></pre></div>
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<p>at the location you want to break into the debugger. You can then step through the code following this statement, and continue running without the debugger using the continue command.</p>
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<h2 id="debugger-commands">Debugger commands</h2>
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<p>The commands recognized by the debugger are listed below. Most commands can be abbreviated to one or two letters as indicated; e.g. <code>h(elp)</code> means that either <code>h</code> or <code>help</code> can be used to enter the help command (but not <code>he</code> or <code>hel</code>, nor <code>H</code> or <code>Help</code> or <code>HELP</code>). Arguments to commands must be separated by whitespace (spaces or tabs).</p>
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<p>Entering a blank line repeats the last command entered. Exception: if the last command was a list command, the next 11 lines are listed.</p>
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<p>Commands that the debugger doesn’t recognize are assumed to be Python statements and are executed in the context of the program being debugged. This is a powerful way to inspect the program being debugged; it is even possible to change a variable or call a function. When an exception occurs in such a statement, the exception name is printed but the debugger’s state is not changed.</p>
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</colgroup>
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<thead>
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<tr class="header">
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<th>Command</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr class="odd">
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<td>a(rgs)</td>
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<td>Print the argument list of the current function.</td>
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</tr>
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<tr class="even">
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<td>c(ont(inue))</td>
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<td>Continue execution, only stop when a breakpoint is encountered.</td>
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</tr>
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<tr class="odd">
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<td>h(elp)</td>
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<td>Without argument, print the list of available commands. With a <em>command</em> as an argument, print help about that command.</td>
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</tr>
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<tr class="even">
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<td>l(ist)</td>
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<td><p>List source code for the current file. Without arguments, list 11 lines around the current line or continue the previous listing.</p>
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<p>The current line in the current frame is indicated by <code>-></code>.</p></td>
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</tr>
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<tr class="odd">
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<td>ll</td>
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<td>List all source code for the current function or frame. (Short for “long list”.)</td>
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</tr>
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<tr class="even">
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<td>n(ext)</td>
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<td>Continue execution until the next line in the current function is reached or it returns. (The difference between <code>next</code> and <code>step</code> is that <code>step</code> stops inside a called function, while <code>next</code> executes called functions at (nearly) full speed, only stopping at the next line in the current function.)</td>
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</tr>
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<tr class="odd">
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<td>r(eturn)</td>
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<td>Continue execution until the current function returns.</td>
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</tr>
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<tr class="even">
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<td>s(tep)</td>
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<td>Execute the current line, stop at the first possible occasion (either in a function that is called or on the next line in the current function.)</td>
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</tbody>
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</table>
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</div>
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</section>
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<footer>
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<a href="https://www.teach.cs.toronto.edu/~csc110y/fall/notes/">CSC110 Course Notes Home</a>
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</footer>
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