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<div class="section" id="module-timeit">
<span id="timeit-measure-execution-time-of-small-code-snippets"></span><h1>27.5. <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-mod docutils literal"><span class="pre">timeit</span></tt></a> — Measure execution time of small code snippets<a class="headerlink" href="#module-timeit" title="Permalink to this headline">¶</a></h1>
<p id="index-0"><strong>Source code:</strong> <a class="reference external" href="http://hg.python.org/cpython/file/3.3/Lib/timeit.py">Lib/timeit.py</a></p>
<hr class="docutils" />
<p>This module provides a simple way to time small bits of Python code. It has both
command line as well as callable interfaces. It avoids a number of common traps
for measuring execution times. See also Tim Peters’ introduction to the
“Algorithms” chapter in the Python Cookbook, published by O’Reilly.</p>
<p>The module defines the following public class:</p>
<dl class="class">
<dt id="timeit.Timer">
<em class="property">class </em><tt class="descclassname">timeit.</tt><tt class="descname">Timer</tt><big>(</big><em>stmt='pass'</em>, <em>setup='pass'</em>, <em>timer=<timer function></em><big>)</big><a class="headerlink" href="#timeit.Timer" title="Permalink to this definition">¶</a></dt>
<dd><p>Class for timing execution speed of small code snippets.</p>
<p>The constructor takes a statement to be timed, an additional statement used for
setup, and a timer function. Both statements default to <tt class="docutils literal"><span class="pre">'pass'</span></tt>; the timer
function is platform-dependent (see the module doc string). <em>stmt</em> and <em>setup</em>
may also contain multiple statements separated by <tt class="docutils literal"><span class="pre">;</span></tt> or newlines, as long as
they don’t contain multi-line string literals.</p>
<p>To measure the execution time of the first statement, use the <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a>
method. The <a class="reference internal" href="#timeit.repeat" title="timeit.repeat"><tt class="xref py py-meth docutils literal"><span class="pre">repeat()</span></tt></a> method is a convenience to call <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a>
multiple times and return a list of results.</p>
<p>The <em>stmt</em> and <em>setup</em> parameters can also take objects that are callable
without arguments. This will embed calls to them in a timer function that
will then be executed by <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a>. Note that the timing overhead is a
little larger in this case because of the extra function calls.</p>
</dd></dl>
<dl class="method">
<dt id="timeit.Timer.print_exc">
<tt class="descclassname">Timer.</tt><tt class="descname">print_exc</tt><big>(</big><em>file=None</em><big>)</big><a class="headerlink" href="#timeit.Timer.print_exc" title="Permalink to this definition">¶</a></dt>
<dd><p>Helper to print a traceback from the timed code.</p>
<p>Typical use:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="n">t</span> <span class="o">=</span> <span class="n">Timer</span><span class="p">(</span><span class="o">...</span><span class="p">)</span> <span class="c"># outside the try/except</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">t</span><span class="o">.</span><span class="n">timeit</span><span class="p">(</span><span class="o">...</span><span class="p">)</span> <span class="c"># or t.repeat(...)</span>
<span class="k">except</span><span class="p">:</span>
<span class="n">t</span><span class="o">.</span><span class="n">print_exc</span><span class="p">()</span>
</pre></div>
</div>
<p>The advantage over the standard traceback is that source lines in the compiled
template will be displayed. The optional <em>file</em> argument directs where the
traceback is sent; it defaults to <tt class="docutils literal"><span class="pre">sys.stderr</span></tt>.</p>
</dd></dl>
<dl class="method">
<dt id="timeit.Timer.repeat">
<tt class="descclassname">Timer.</tt><tt class="descname">repeat</tt><big>(</big><em>repeat=3</em>, <em>number=1000000</em><big>)</big><a class="headerlink" href="#timeit.Timer.repeat" title="Permalink to this definition">¶</a></dt>
<dd><p>Call <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a> a few times.</p>
<p>This is a convenience function that calls the <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a> repeatedly,
returning a list of results. The first argument specifies how many times to
call <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a>. The second argument specifies the <em>number</em> argument for
<a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-func docutils literal"><span class="pre">timeit()</span></tt></a>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">It’s tempting to calculate mean and standard deviation from the result vector
and report these. However, this is not very useful. In a typical case, the
lowest value gives a lower bound for how fast your machine can run the given
code snippet; higher values in the result vector are typically not caused by
variability in Python’s speed, but by other processes interfering with your
timing accuracy. So the <a class="reference internal" href="functions.html#min" title="min"><tt class="xref py py-func docutils literal"><span class="pre">min()</span></tt></a> of the result is probably the only number
you should be interested in. After that, you should look at the entire vector
and apply common sense rather than statistics.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="timeit.Timer.timeit">
<tt class="descclassname">Timer.</tt><tt class="descname">timeit</tt><big>(</big><em>number=1000000</em><big>)</big><a class="headerlink" href="#timeit.Timer.timeit" title="Permalink to this definition">¶</a></dt>
<dd><p>Time <em>number</em> executions of the main statement. This executes the setup
statement once, and then returns the time it takes to execute the main statement
a number of times, measured in seconds as a float. The argument is the number
of times through the loop, defaulting to one million. The main statement, the
setup statement and the timer function to be used are passed to the constructor.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>By default, <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a> temporarily turns off <a class="reference internal" href="../glossary.html#term-garbage-collection"><em class="xref std std-term">garbage collection</em></a>
during the timing. The advantage of this approach is that it makes
independent timings more comparable. This disadvantage is that GC may be
an important component of the performance of the function being measured.
If so, GC can be re-enabled as the first statement in the <em>setup</em> string.
For example:</p>
<div class="last highlight-python3"><div class="highlight"><pre><span class="n">timeit</span><span class="o">.</span><span class="n">Timer</span><span class="p">(</span><span class="s">'for i in range(10): oct(i)'</span><span class="p">,</span> <span class="s">'gc.enable()'</span><span class="p">)</span><span class="o">.</span><span class="n">timeit</span><span class="p">()</span>
</pre></div>
</div>
</div>
</dd></dl>
<p>The module also defines three convenience functions:</p>
<dl class="function">
<dt id="timeit.default_timer">
<tt class="descclassname">timeit.</tt><tt class="descname">default_timer</tt><big>(</big><big>)</big><a class="headerlink" href="#timeit.default_timer" title="Permalink to this definition">¶</a></dt>
<dd><p>The default timer, which is always <a class="reference internal" href="time.html#time.perf_counter" title="time.perf_counter"><tt class="xref py py-func docutils literal"><span class="pre">time.perf_counter()</span></tt></a>.</p>
</dd></dl>
<dl class="function">
<dt id="timeit.repeat">
<tt class="descclassname">timeit.</tt><tt class="descname">repeat</tt><big>(</big><em>stmt='pass'</em>, <em>setup='pass'</em>, <em>timer=<default timer></em>, <em>repeat=3</em>, <em>number=1000000</em><big>)</big><a class="headerlink" href="#timeit.repeat" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a <a class="reference internal" href="#timeit.Timer" title="timeit.Timer"><tt class="xref py py-class docutils literal"><span class="pre">Timer</span></tt></a> instance with the given statement, setup code and timer
function and run its <a class="reference internal" href="#timeit.repeat" title="timeit.repeat"><tt class="xref py py-meth docutils literal"><span class="pre">repeat()</span></tt></a> method with the given repeat count and
<em>number</em> executions.</p>
</dd></dl>
<dl class="function">
<dt id="timeit.timeit">
<tt class="descclassname">timeit.</tt><tt class="descname">timeit</tt><big>(</big><em>stmt='pass'</em>, <em>setup='pass'</em>, <em>timer=<default timer></em>, <em>number=1000000</em><big>)</big><a class="headerlink" href="#timeit.timeit" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a <a class="reference internal" href="#timeit.Timer" title="timeit.Timer"><tt class="xref py py-class docutils literal"><span class="pre">Timer</span></tt></a> instance with the given statement, setup code and timer
function and run its <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-meth docutils literal"><span class="pre">timeit()</span></tt></a> method with <em>number</em> executions.</p>
</dd></dl>
<div class="section" id="command-line-interface">
<h2>27.5.1. Command Line Interface<a class="headerlink" href="#command-line-interface" title="Permalink to this headline">¶</a></h2>
<p>When called as a program from the command line, the following form is used:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="n">python</span> <span class="o">-</span><span class="n">m</span> <span class="n">timeit</span> <span class="p">[</span><span class="o">-</span><span class="n">n</span> <span class="n">N</span><span class="p">]</span> <span class="p">[</span><span class="o">-</span><span class="n">r</span> <span class="n">N</span><span class="p">]</span> <span class="p">[</span><span class="o">-</span><span class="n">s</span> <span class="n">S</span><span class="p">]</span> <span class="p">[</span><span class="o">-</span><span class="n">t</span><span class="p">]</span> <span class="p">[</span><span class="o">-</span><span class="n">c</span><span class="p">]</span> <span class="p">[</span><span class="o">-</span><span class="n">h</span><span class="p">]</span> <span class="p">[</span><span class="n">statement</span> <span class="o">...</span><span class="p">]</span>
</pre></div>
</div>
<p>Where the following options are understood:</p>
<dl class="cmdoption">
<dt id="cmdoption-timeit-n">
<tt class="descname">-n</tt><tt class="descclassname"> N</tt><tt class="descclassname">, </tt><tt class="descname">--number</tt><tt class="descclassname">=N</tt><a class="headerlink" href="#cmdoption-timeit-n" title="Permalink to this definition">¶</a></dt>
<dd><p>how many times to execute ‘statement’</p>
</dd></dl>
<dl class="cmdoption">
<dt id="cmdoption-timeit-r">
<tt class="descname">-r</tt><tt class="descclassname"> N</tt><tt class="descclassname">, </tt><tt class="descname">--repeat</tt><tt class="descclassname">=N</tt><a class="headerlink" href="#cmdoption-timeit-r" title="Permalink to this definition">¶</a></dt>
<dd><p>how many times to repeat the timer (default 3)</p>
</dd></dl>
<dl class="cmdoption">
<dt id="cmdoption-timeit-s">
<tt class="descname">-s</tt><tt class="descclassname"> S</tt><tt class="descclassname">, </tt><tt class="descname">--setup</tt><tt class="descclassname">=S</tt><a class="headerlink" href="#cmdoption-timeit-s" title="Permalink to this definition">¶</a></dt>
<dd><p>statement to be executed once initially (default <tt class="docutils literal"><span class="pre">pass</span></tt>)</p>
</dd></dl>
<dl class="cmdoption">
<dt id="cmdoption-timeit-p">
<tt class="descname">-p</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--process</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-timeit-p" title="Permalink to this definition">¶</a></dt>
<dd><p>measure process time, not wallclock time, using <a class="reference internal" href="time.html#time.process_time" title="time.process_time"><tt class="xref py py-func docutils literal"><span class="pre">time.process_time()</span></tt></a>
instead of <a class="reference internal" href="time.html#time.perf_counter" title="time.perf_counter"><tt class="xref py py-func docutils literal"><span class="pre">time.perf_counter()</span></tt></a>, which is the default</p>
<p class="versionadded">
<span class="versionmodified">New in version 3.3.</span> </p>
</dd></dl>
<dl class="cmdoption">
<dt id="cmdoption-timeit-t">
<tt class="descname">-t</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--time</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-timeit-t" title="Permalink to this definition">¶</a></dt>
<dd><p>use <a class="reference internal" href="time.html#time.time" title="time.time"><tt class="xref py py-func docutils literal"><span class="pre">time.time()</span></tt></a> (deprecated)</p>
</dd></dl>
<dl class="cmdoption">
<dt id="cmdoption-timeit-c">
<tt class="descname">-c</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--clock</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-timeit-c" title="Permalink to this definition">¶</a></dt>
<dd><p>use <a class="reference internal" href="time.html#time.clock" title="time.clock"><tt class="xref py py-func docutils literal"><span class="pre">time.clock()</span></tt></a> (deprecated)</p>
</dd></dl>
<dl class="cmdoption">
<dt id="cmdoption-timeit-v">
<tt class="descname">-v</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--verbose</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-timeit-v" title="Permalink to this definition">¶</a></dt>
<dd><p>print raw timing results; repeat for more digits precision</p>
</dd></dl>
<dl class="cmdoption">
<dt id="cmdoption-timeit-h">
<tt class="descname">-h</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--help</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-timeit-h" title="Permalink to this definition">¶</a></dt>
<dd><p>print a short usage message and exit</p>
</dd></dl>
<p>A multi-line statement may be given by specifying each line as a separate
statement argument; indented lines are possible by enclosing an argument in
quotes and using leading spaces. Multiple <a class="reference internal" href="#cmdoption-timeit-s"><em class="xref std std-option">-s</em></a> options are treated
similarly.</p>
<p>If <a class="reference internal" href="#cmdoption-timeit-n"><em class="xref std std-option">-n</em></a> is not given, a suitable number of loops is calculated by trying
successive powers of 10 until the total time is at least 0.2 seconds.</p>
<p><a class="reference internal" href="#timeit.default_timer" title="timeit.default_timer"><tt class="xref py py-func docutils literal"><span class="pre">default_timer()</span></tt></a> measurements can be affected by other programs running on
the same machine, so the best thing to do when accurate timing is necessary is
to repeat the timing a few times and use the best time. The <a class="reference internal" href="#cmdoption-timeit-r"><em class="xref std std-option">-r</em></a>
option is good for this; the default of 3 repetitions is probably enough in
most cases. You can use <a class="reference internal" href="time.html#time.process_time" title="time.process_time"><tt class="xref py py-func docutils literal"><span class="pre">time.process_time()</span></tt></a> to measure CPU time.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">There is a certain baseline overhead associated with executing a pass statement.
The code here doesn’t try to hide it, but you should be aware of it. The
baseline overhead can be measured by invoking the program without arguments.</p>
</div>
<p>The baseline overhead differs between Python versions! Also, to fairly compare
older Python versions to Python 2.3, you may want to use Python’s <em class="xref std std-option">-O</em>
option for the older versions to avoid timing <tt class="docutils literal"><span class="pre">SET_LINENO</span></tt> instructions.</p>
</div>
<div class="section" id="examples">
<h2>27.5.2. Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
<p>Here are two example sessions (one using the command line, one using the module
interface) that compare the cost of using <a class="reference internal" href="functions.html#hasattr" title="hasattr"><tt class="xref py py-func docutils literal"><span class="pre">hasattr()</span></tt></a> vs.
<a class="reference internal" href="../reference/compound_stmts.html#try"><tt class="xref std std-keyword docutils literal"><span class="pre">try</span></tt></a>/<a class="reference internal" href="../reference/compound_stmts.html#except"><tt class="xref std std-keyword docutils literal"><span class="pre">except</span></tt></a> to test for missing and present object
attributes.</p>
<div class="highlight-python3"><pre>$ python -m timeit 'try:' ' str.__bool__' 'except AttributeError:' ' pass'
100000 loops, best of 3: 15.7 usec per loop
$ python -m timeit 'if hasattr(str, "__bool__"): pass'
100000 loops, best of 3: 4.26 usec per loop
$ python -m timeit 'try:' ' int.__bool__' 'except AttributeError:' ' pass'
1000000 loops, best of 3: 1.43 usec per loop
$ python -m timeit 'if hasattr(int, "__bool__"): pass'
100000 loops, best of 3: 2.23 usec per loop</pre>
</div>
<div class="highlight-python3"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">timeit</span>
<span class="gp">>>> </span><span class="n">s</span> <span class="o">=</span> <span class="s">"""</span><span class="se">\</span>
<span class="gp">... </span><span class="s">try:</span>
<span class="gp">... </span><span class="s"> str.__bool__</span>
<span class="gp">... </span><span class="s">except AttributeError:</span>
<span class="gp">... </span><span class="s"> pass</span>
<span class="gp">... </span><span class="s">"""</span>
<span class="gp">>>> </span><span class="n">t</span> <span class="o">=</span> <span class="n">timeit</span><span class="o">.</span><span class="n">Timer</span><span class="p">(</span><span class="n">stmt</span><span class="o">=</span><span class="n">s</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="s">"%.2f usec/pass"</span> <span class="o">%</span> <span class="p">(</span><span class="mi">1000000</span> <span class="o">*</span> <span class="n">t</span><span class="o">.</span><span class="n">timeit</span><span class="p">(</span><span class="n">number</span><span class="o">=</span><span class="mi">100000</span><span class="p">)</span><span class="o">/</span><span class="mi">100000</span><span class="p">))</span>
<span class="go">17.09 usec/pass</span>
<span class="gp">>>> </span><span class="n">s</span> <span class="o">=</span> <span class="s">"""</span><span class="se">\</span>
<span class="gp">... </span><span class="s">if hasattr(str, '__bool__'): pass</span>
<span class="gp">... </span><span class="s">"""</span>
<span class="gp">>>> </span><span class="n">t</span> <span class="o">=</span> <span class="n">timeit</span><span class="o">.</span><span class="n">Timer</span><span class="p">(</span><span class="n">stmt</span><span class="o">=</span><span class="n">s</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="s">"%.2f usec/pass"</span> <span class="o">%</span> <span class="p">(</span><span class="mi">1000000</span> <span class="o">*</span> <span class="n">t</span><span class="o">.</span><span class="n">timeit</span><span class="p">(</span><span class="n">number</span><span class="o">=</span><span class="mi">100000</span><span class="p">)</span><span class="o">/</span><span class="mi">100000</span><span class="p">))</span>
<span class="go">4.85 usec/pass</span>
<span class="gp">>>> </span><span class="n">s</span> <span class="o">=</span> <span class="s">"""</span><span class="se">\</span>
<span class="gp">... </span><span class="s">try:</span>
<span class="gp">... </span><span class="s"> int.__bool__</span>
<span class="gp">... </span><span class="s">except AttributeError:</span>
<span class="gp">... </span><span class="s"> pass</span>
<span class="gp">... </span><span class="s">"""</span>
<span class="gp">>>> </span><span class="n">t</span> <span class="o">=</span> <span class="n">timeit</span><span class="o">.</span><span class="n">Timer</span><span class="p">(</span><span class="n">stmt</span><span class="o">=</span><span class="n">s</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="s">"%.2f usec/pass"</span> <span class="o">%</span> <span class="p">(</span><span class="mi">1000000</span> <span class="o">*</span> <span class="n">t</span><span class="o">.</span><span class="n">timeit</span><span class="p">(</span><span class="n">number</span><span class="o">=</span><span class="mi">100000</span><span class="p">)</span><span class="o">/</span><span class="mi">100000</span><span class="p">))</span>
<span class="go">1.97 usec/pass</span>
<span class="gp">>>> </span><span class="n">s</span> <span class="o">=</span> <span class="s">"""</span><span class="se">\</span>
<span class="gp">... </span><span class="s">if hasattr(int, '__bool__'): pass</span>
<span class="gp">... </span><span class="s">"""</span>
<span class="gp">>>> </span><span class="n">t</span> <span class="o">=</span> <span class="n">timeit</span><span class="o">.</span><span class="n">Timer</span><span class="p">(</span><span class="n">stmt</span><span class="o">=</span><span class="n">s</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="s">"%.2f usec/pass"</span> <span class="o">%</span> <span class="p">(</span><span class="mi">1000000</span> <span class="o">*</span> <span class="n">t</span><span class="o">.</span><span class="n">timeit</span><span class="p">(</span><span class="n">number</span><span class="o">=</span><span class="mi">100000</span><span class="p">)</span><span class="o">/</span><span class="mi">100000</span><span class="p">))</span>
<span class="go">3.15 usec/pass</span>
</pre></div>
</div>
<p>To give the <a class="reference internal" href="#module-timeit" title="timeit: Measure the execution time of small code snippets."><tt class="xref py py-mod docutils literal"><span class="pre">timeit</span></tt></a> module access to functions you define, you can pass a
<tt class="docutils literal"><span class="pre">setup</span></tt> parameter which contains an import statement:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="sd">"""Stupid test function"""</span>
<span class="n">L</span> <span class="o">=</span> <span class="p">[</span><span class="n">i</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">100</span><span class="p">)]</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">'__main__'</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">timeit</span> <span class="k">import</span> <span class="n">Timer</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">Timer</span><span class="p">(</span><span class="s">"test()"</span><span class="p">,</span> <span class="s">"from __main__ import test"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="o">.</span><span class="n">timeit</span><span class="p">())</span>
</pre></div>
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<li><a class="reference internal" href="#command-line-interface">27.5.1. Command Line Interface</a></li>
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