Mercurial > hgrepos > Python > libs > ConfigMix

annotate tests/_perf_lookups.py @ 494:60683361ebed

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Test-script for checking the costs of different variable lookup methods Variant from https://stackoverflow.com/questions/2714573/instance-variables-vs-class-variables-in-python
author Franz Glasner <f.glasner@feldmann-mg.com>
date Fri, 17 Dec 2021 19:24:54 +0100
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60683361ebed Test-script for checking the costs of different variable lookup methods
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1 from __future__ import print_function
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2 import timeit
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3
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4 setup='''
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5 XGLOBAL= 5
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6 class A:
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7 xclass = 5
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8 def __init__(self):
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9 self.xinstance = 5
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10 def f1(self):
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11 xlocal = 5
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12 x = self.xinstance
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13 def f2(self):
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14 xlocal = 5
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15 x = A.xclass
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16 def f3(self):
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17 xlocal = 5
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18 x = XGLOBAL
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19 def f4(self):
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20 xlocal = 5
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21 x = xlocal
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22 def f5(self):
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23 xlocal = 5
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24 x = self.xclass
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25 a = A()
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26 '''
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27 num = 300000000
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28 num = 90000000
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29 print('access via instance variable: %.3f' % timeit.timeit('a.f1()', setup=setup, number=num) )
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30 print('access via class variable (via classname): %.3f' % timeit.timeit('a.f2()', setup=setup, number=num) )
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31 print('access via class variable (via self): %.3f' % timeit.timeit('a.f5()', setup=setup, number=num) )
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32 print('access via module variable: %.3f' % timeit.timeit('a.f3()', setup=setup, number=num) )
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33 print('access via local variable: %.3f' % timeit.timeit('a.f4()', setup=setup, number=num) )