def calc_prod(lst): def lazy_prod(): def f(x, y): return x * y return reduce(f, lst, 1) return lazy_prod f = calc_prod([1, 2, 3, 4]) print (f()) Traceback (most recent call last): File "<ipython-input-28-5166a7a3086

def calc_prod(lst):

def lazy_prod():

def f(x, y):

return x * y

return reduce(f, lst, 1)

return lazy_prod

f = calc_prod([1, 2, 3, 4])

print (f())

Traceback (most recent call last):

File "<ipython-input-28-5166a7a30861>", line 9, in <module>

print (f())

File "<ipython-input-28-5166a7a30861>", line 5, in lazy_prod

return reduce(f, lst, 1)

NameError: name 'reduce' is not defined

laogedi

2018-08-23

源自：python进阶 2-8

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suarezxyw96
2018-08-23

你用的是python2的语法，但是你的环境是python3的环境。reduce函数在python3的内建函数移除了，放入了functools模块。可以在前面添加这样一行代码：

from functools import reduce

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def calc_prod(lst): def lazy_prod(): def f(x, y): return x * y return reduce(f, lst, 1) return lazy_prod f = calc_prod([1, 2, 3, 4]) print (f()) Traceback (most recent call last): File "<ipython-input-28-5166a7a3086

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def calc_prod(lst): def lazy_prod(): def f(x, y): return x * y return reduce(f, lst, 1) return lazy_prod f = calc_prod([1, 2, 3, 4]) print (f()) Traceback (most recent call last): File "<ipython-input-28-5166a7a3086

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def calc_prod(lst): def lazy_prod(): def f(x, y): return x * y return reduce(f, lst, 1) return lazy_prod f = calc_prod([1, 2, 3, 4]) print (f()) Traceback (most recent call last): File "<ipython-input-28-5166a7a3086