<分区>
以下测试失败:
#!/usr/bin/env python
def f(*args):
"""
>>> t = 1, -1
>>> f(*map(lambda i: lambda: i, t))
[1, -1]
>>> f(*(lambda: i for i in t)) # -> [-1, -1]
[1, -1]
>>> f(*[lambda: i for i in t]) # -> [-1, -1]
[1, -1]
"""
alist = [a() for a in args]
print(alist)
if __name__ == '__main__':
import doctest; doctest.testmod()
换句话说:
>>> t = 1, -1
>>> args = []
>>> for i in t:
... args.append(lambda: i)
...
>>> map(lambda a: a(), args)
[-1, -1]
>>> args = []
>>> for i in t:
... args.append((lambda i: lambda: i)(i))
...
>>> map(lambda a: a(), args)
[1, -1]
>>> args = []
>>> for i in t:
... args.append(lambda i=i: i)
...
>>> map(lambda a: a(), args)
[1, -1]