我一直在一个项目中工作，该项目管理大量的单词列表，并通过大量测试使它们通过，以验证列表中的每个单词是否正确。有趣的是，每当我使用“更快”的工具（如itertools模块）时，它们似乎就会变慢。

最后，我决定问这个问题，因为我可能做错了什么。以下代码将尝试测试any()函数的性能与使用循环的关系。

#!/usr/bin/python3
#

import time
from unicodedata import normalize


file_path='./tests'


start=time.time()
with open(file_path, encoding='utf-8', mode='rt') as f:
    tests_list=f.read()
print('File reading done in {} seconds'.format(time.time() - start))

start=time.time()
tests_list=[line.strip() for line in normalize('NFC',tests_list).splitlines()]
print('String formalization, and list strip done in {} seconds'.format(time.time()-start))
print('{} strings'.format(len(tests_list)))


unallowed_combinations=['ab','ac','ad','ae','af','ag','ah','ai','af','ax',
                        'ae','rt','rz','bt','du','iz','ip','uy','io','ik',
                        'il','iw','ww','wp']


def combination_is_valid(string):
    if any(combination in string for combination in unallowed_combinations):
        return False

    return True


def combination_is_valid2(string):
    for combination in unallowed_combinations:
        if combination in string:
            return False

    return True


print('Testing the performance of any()')

start=time.time()
for string in tests_list:
    combination_is_valid(string)
print('combination_is_valid ended in {} seconds'.format(time.time()-start))


start=time.time()
for string in tests_list:
    combination_is_valid2(string)
print('combination_is_valid2 ended in {} seconds'.format(time.time()-start))

前面的代码很能代表我所做的测试，如果我们看一下结果，则可以：

File reading done in 0.22988605499267578 seconds
String formalization, and list strip done in 6.803032875061035 seconds
38709922 strings
Testing the performance of any()
combination_is_valid ended in 80.74802565574646 seconds
combination_is_valid2 ended in 41.69514226913452 seconds


File reading done in 0.24268722534179688 seconds
String formalization, and list strip done in 6.720442771911621 seconds
38709922 strings
Testing the performance of any()
combination_is_valid ended in 79.05265760421753 seconds
combination_is_valid2 ended in 42.24800777435303 seconds

我发现使用循环比使用快一半，这有点令人惊讶any()。对此有什么解释？难道我做错了什么？

（我在GNU-Linux下使用python3.4）