Python 如何打乱列表中的顺序？
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时间：2020-08-19 22:01:00 来源:igfitidea点击:
How to shuffle the order in a list?
提问by Hiroyuki Nuri
I would like to shuffle the order of the elements in a list.
我想打乱列表中元素的顺序。
from random import shuffle
words = ['red', 'adventure', 'cat', 'cat']
shuffled = shuffle(words)
print(shuffled) # expect new order for, example ['cat', 'red', 'adventure', 'cat']
As response I get None, why?
作为我得到的回应None，为什么？
回答by vallentin
It's because random.shuffleshuffles in place and doesn't return anything (thus why you get None).
这是因为random.shuffleshuffle 到位并且不返回任何东西（这就是为什么你得到None）。
import random
words = ['red', 'adventure', 'cat', 'cat']
random.shuffle(words)
print(words) # Possible Output: ['cat', 'cat', 'red', 'adventure']
Edit:
编辑：
Given your edit, what you need to change is:
鉴于您的编辑，您需要更改的是：
from random import shuffle
words = ['red', 'adventure', 'cat', 'cat']
newwords = words[:] # Copy words
shuffle(newwords) # Shuffle newwords
print(newwords) # Possible Output: ['cat', 'cat', 'red', 'adventure']
or
或者
from random import sample
words = ['red', 'adventure', 'cat', 'cat']
newwords = sample(words, len(words)) # Copy and shuffle
print(newwords) # Possible Output: ['cat', 'cat', 'red', 'adventure']
