需要了解Python生成器对象 [英] Need to understand Python generator object

问题描述

以下:

name = 'TODD'
chars = set('AEIOU')
for ii in range(-1, int(math.copysign(len(name) + 1, -1)), -1):
    if any((cc in chars) for cc in name[ii]):
        print 'Found'
    else:
        print 'Not Found'

我知道any(...)内部是一个生成器对象.我不明白的是缺少括号-如果括号属于any()函数，在生成器表达式周围是否应该有另一套括号?

I understand that what's inside any(...) is a generator object. What I don't understand is the lack of parentheses - if the parentheses belong to the any() function, shouldn't there be another set of parentheses around the generator expression?

谢谢.

推荐答案

在仅带有一个参数

The parenthesis can be omitted when used in function calls with only one argument, the generator expression syntax specifically allows for it.

仅具有一个参数的调用可以省略括号.有关详细信息，请参见通话部分.

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