python 中itertools 模块（五）

product()

import itertools

for i in itertools.product('python'):#类似于for循环
    print(i)

运行结果：
D:\Python\Python36\python.exe D:/Python_test/day_lesson/test.py
(‘p’,)
(‘y’,)
(‘t’,)
(‘h’,)
(‘o’,)
(‘n’,)

Process finished with exit code 0

import itertools

for i in itertools.product('helo', repeat=2):#长度2元组
    print(i)

运行结果
D:\Python\Python36\python.exe D:/Python_test/day_lesson/test.py
(‘h’, ‘h’)
(‘h’, ‘e’)
(‘h’, ‘l’)
(‘h’, ‘o’)
(‘e’, ‘h’)
(‘e’, ‘e’)
(‘e’, ‘l’)
(‘e’, ‘o’)
(‘l’, ‘h’)
(‘l’, ‘e’)
(‘l’, ‘l’)
(‘l’, ‘o’)
(‘o’, ‘h’)
(‘o’, ‘e’)
(‘o’, ‘l’)
(‘o’, ‘o’)

Process finished with exit code 0

permutations()

import itertools

for i in itertools.permutations(range(1, 4), 2):#长度2元组，所有可能的排列，无重复元素
    print(i)

运行结果
D:\Python\Python36\python.exe D:/Python_test/day_lesson/test.py
(1, 2)
(1, 3)
(2, 1)
(2, 3)
(3, 1)
(3, 2)

Process finished with exit code 0

combinations(）

import itertools

for i in itertools.combinations(range(1, 4), 2):#长度2元组，有序，无重复元素
    print(i)

运行结果
D:\Python\Python36\python.exe D:/Python_test/day_lesson/test.py
(1, 2)
(1, 3)
(2, 3)

Process finished with exit code 0

combinations_with_replacement（）

import itertools

for i in itertools.combinations_with_replacement(range(1, 4), 2):#长度2元组，有序，元素可重复
    print(i)

运行结果
D:\Python\Python36\python.exe D:/Python_test/day_lesson/test.py
(1, 1)
(1, 2)
(1, 3)
(2, 2)
(2, 3)
(3, 3)

Process finished with exit code 0

来源：https://blog.csdn.net/weixin_43095456/article/details/98754245

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python for循环

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