python使用generator生成list

list官方文档：

• Lists are mutable sequences, typically used to store collections of homogeneous items (where the precise degree of similarity will vary by application).

• class list([iterable])

  • Lists may be constructed in several ways:
    Using a pair of square brackets to denote the empty list: []
    Using square brackets, separating items with commas: [a], [a, b, c]
    Using a list comprehension: [x for x in iterable]
    Using the type constructor: list() or list(iterable)

generator本身就是一个iterator，所以肯定是iterable的。

eg:

def take (n):
    for i in range(n):
        yield i

l = list(take(4))

>>> l = [0,1,2,3]