| 1 | #!/usr/bin/env python2
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| 2 | """
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| 3 | length.py
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| 4 | """
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| 5 | from __future__ import print_function
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| 6 |
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| 7 | import os
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| 8 | from mycpp.mylib import log
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| 9 | from mycpp import mylib
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| 10 |
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| 11 | from typing import Optional
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| 12 |
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| 13 |
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| 14 | def TestMaybeStrEquals():
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| 15 | # type: () -> None
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| 16 |
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| 17 | a = 'foo'
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| 18 | b = 'bar'
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| 19 |
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| 20 | y = 'foo' # type: Optional[str]
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| 21 | n = None # type: Optional[str]
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| 22 |
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| 23 | log('a == b -> %d', a == b)
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| 24 | log('a != b -> %d', a != b)
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| 25 |
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| 26 | log('a == y -> %d', a == y)
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| 27 | log('a != y -> %d', a != y)
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| 28 |
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| 29 | log('a == n -> %d', a == n)
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| 30 | log('a != n -> %d', a != n)
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| 31 |
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| 32 |
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| 33 | def run_tests():
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| 34 | # type: () -> None
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| 35 | mystr = 'abcd'
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| 36 | log("len(mystr) = %d", len(mystr))
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| 37 | log("mystr[1] = %s", mystr[1])
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| 38 | log("mystr[1:] = %s", mystr[1:])
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| 39 | log("mystr[1:3] = %s", mystr[1:3])
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| 40 | log("mystr[:-2] = %s", mystr[:-2])
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| 41 |
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| 42 | for c in mystr:
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| 43 | if c == 'b':
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| 44 | continue
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| 45 | log('c = %s', c)
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| 46 | if c == 'c':
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| 47 | break
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| 48 |
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| 49 | log("")
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| 50 |
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| 51 | # NOTE: Not implementing mylist[:n] or mylist[:-1] (negative) until I see
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| 52 | # usages.
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| 53 | mylist = ['w', 'x', 'y', 'z']
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| 54 | log("len(mylist) = %d", len(mylist))
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| 55 | log("mylist[1] = %s", mylist[1])
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| 56 |
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| 57 | # can't print lists directly
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| 58 | log("len(mylist[1:]) = %d", len(mylist[1:]))
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| 59 |
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| 60 | for c in mylist:
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| 61 | if c == 'x':
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| 62 | continue
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| 63 | log('c = %s', c)
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| 64 | if c == 'y':
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| 65 | break
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| 66 |
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| 67 | # to test nullptr. Python correctly infers this as 'str'
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| 68 | c2 = None # type: Optional[str]
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| 69 | for c2 in mystr:
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| 70 | if c2 != 'a': # test != operator
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| 71 | log('%s != a', c2)
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| 72 |
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| 73 | log('')
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| 74 |
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| 75 | TestMaybeStrEquals()
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| 76 |
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| 77 |
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| 78 | def run_benchmarks():
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| 79 | # type: () -> None
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| 80 | n = 1000000
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| 81 |
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| 82 | mystr = 'abcd'
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| 83 | mylist = ['w', 'x', 'y', 'z']
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| 84 |
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| 85 | result = 0
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| 86 | i = 0
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| 87 | while i < n:
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| 88 | # C++ has a big advantage here
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| 89 | #result += len(mystr)
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| 90 | #result += len(mylist)
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| 91 |
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| 92 | # C++ shows no real advantage here
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| 93 | result += len(mystr[1:])
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| 94 | result += len(mylist[1:])
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| 95 |
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| 96 | i += 1
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| 97 |
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| 98 | mylib.MaybeCollect()
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| 99 |
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| 100 | log('result = %d', result)
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| 101 | log('iterations = %d', n)
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| 102 |
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| 103 |
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| 104 | if __name__ == '__main__':
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| 105 | if os.getenv('BENCHMARK'):
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| 106 | log('Benchmarking...')
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| 107 | run_benchmarks()
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| 108 | else:
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| 109 | run_tests()
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