如何在Python中以随机顺序遍历dict? [英] How to iterate through dict in random order in Python?

问题描述

如何以随机顺序遍历字典的所有项目?我的意思是random.shuffle，不过是字典.

How can I iterate through all items of a dictionary in a random order? I mean something random.shuffle, but for a dictionary.

推荐答案

dict是一组无序的键/值对.迭代dict时，它实际上是随机的.但是要显式地随机化键值对的序列，您需要使用其他有序对象，例如列表. dict.items()，dict.keys()和dict.values()每个返回列表都可以改组.

A dict is an unordered set of key-value pairs. When you iterate a dict, it is effectively random. But to explicitly randomize the sequence of key-value pairs, you need to work with a different object that is ordered, like a list. dict.items(), dict.keys(), and dict.values() each return lists, which can be shuffled.

items=d.items() # List of tuples
random.shuffle(items)
for key, value in items:
    print key, value

keys=d.keys() # List of keys
random.shuffle(keys)
for key in keys:
    print key, d[key]

或者，如果您不关心按键，则:

Or, if you don't care about the keys:

values=d.values() # List of values
random.shuffle(values) # Shuffles in-place
for value in values:
    print value

您还可以随机排序":

for key, value in sorted(d.items(), key=lambda x: random.random()):
    print key, value

这篇关于如何在Python中以随机顺序遍历dict?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！