projects / OpenSPARC-T2-SAM / blame
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| 53 | ||
| 54 | <H2><A NAME="SECTION00121020000000000000000"> | |
| 55 | 10.10.2 Examples</A> | |
| 56 | </H2> | |
| 57 | ||
| 58 | <P> | |
| 59 | Here are two example sessions (one using the command line, one using | |
| 60 | the module interface) that compare the cost of using | |
| 61 | <tt class="function">hasattr()</tt> vs. <tt class="keyword">try</tt>/<tt class="keyword">except</tt> to test for | |
| 62 | missing and present object attributes. | |
| 63 | ||
| 64 | <P> | |
| 65 | <div class="verbatim"><pre> | |
| 66 | % timeit.py 'try:' ' str.__nonzero__' 'except AttributeError:' ' pass' | |
| 67 | 100000 loops, best of 3: 15.7 usec per loop | |
| 68 | % timeit.py 'if hasattr(str, "__nonzero__"): pass' | |
| 69 | 100000 loops, best of 3: 4.26 usec per loop | |
| 70 | % timeit.py 'try:' ' int.__nonzero__' 'except AttributeError:' ' pass' | |
| 71 | 1000000 loops, best of 3: 1.43 usec per loop | |
| 72 | % timeit.py 'if hasattr(int, "__nonzero__"): pass' | |
| 73 | 100000 loops, best of 3: 2.23 usec per loop | |
| 74 | </pre></div> | |
| 75 | ||
| 76 | <P> | |
| 77 | <div class="verbatim"><pre> | |
| 78 | >>> import timeit | |
| 79 | >>> s = """\ | |
| 80 | ... try: | |
| 81 | ... str.__nonzero__ | |
| 82 | ... except AttributeError: | |
| 83 | ... pass | |
| 84 | ... """ | |
| 85 | >>> t = timeit.Timer(stmt=s) | |
| 86 | >>> print "%.2f usec/pass" % (1000000 * t.timeit(number=100000)/100000) | |
| 87 | 17.09 usec/pass | |
| 88 | >>> s = """\ | |
| 89 | ... if hasattr(str, '__nonzero__'): pass | |
| 90 | ... """ | |
| 91 | >>> t = timeit.Timer(stmt=s) | |
| 92 | >>> print "%.2f usec/pass" % (1000000 * t.timeit(number=100000)/100000) | |
| 93 | 4.85 usec/pass | |
| 94 | >>> s = """\ | |
| 95 | ... try: | |
| 96 | ... int.__nonzero__ | |
| 97 | ... except AttributeError: | |
| 98 | ... pass | |
| 99 | ... """ | |
| 100 | >>> t = timeit.Timer(stmt=s) | |
| 101 | >>> print "%.2f usec/pass" % (1000000 * t.timeit(number=100000)/100000) | |
| 102 | 1.97 usec/pass | |
| 103 | >>> s = """\ | |
| 104 | ... if hasattr(int, '__nonzero__'): pass | |
| 105 | ... """ | |
| 106 | >>> t = timeit.Timer(stmt=s) | |
| 107 | >>> print "%.2f usec/pass" % (1000000 * t.timeit(number=100000)/100000) | |
| 108 | 3.15 usec/pass | |
| 109 | </pre></div> | |
| 110 | ||
| 111 | <P> | |
| 112 | To give the <tt class="module">timeit</tt> module access to functions you | |
| 113 | define, you can pass a <code>setup</code> parameter which contains an import | |
| 114 | statement: | |
| 115 | ||
| 116 | <P> | |
| 117 | <div class="verbatim"><pre> | |
| 118 | def test(): | |
| 119 | "Stupid test function" | |
| 120 | L = [] | |
| 121 | for i in range(100): | |
| 122 | L.append(i) | |
| 123 | ||
| 124 | if __name__=='__main__': | |
| 125 | from timeit import Timer | |
| 126 | t = Timer("test()", "from __main__ import test") | |
| 127 | print t.timeit() | |
| 128 | </pre></div> | |
| 129 | ||
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