从字符串中删除重复字符 [英] Removing duplicate characters from a string

问题描述

如何使用 Python 从字符串中删除重复字符?例如，假设我有一个字符串:

How can I remove duplicate characters from a string using Python? For example, let's say I have a string:

foo = 'mppmt'

如何制作字符串:

foo = 'mpt'

注意:顺序并不重要

推荐答案

如果顺序不重要，可以使用

If order does not matter, you can use

"".join(set(foo))

set() 将在字符串中创建一组唯一的字母，"".join() 将按任意顺序将字母连接回字符串.

set() will create a set of unique letters in the string, and "".join() will join the letters back to a string in arbitrary order.

如果顺序确实很重要，您可以使用 dict 而不是 set，因为 Python 3.7 保留了键的插入顺序.(在 CPython 实现中，这在 Python 3.6 中已作为实现细节支持.)

If order does matter, you can use a dict instead of a set, which since Python 3.7 preserves the insertion order of the keys. (In the CPython implementation, this is already supported in Python 3.6 as an implementation detail.)

foo = "mppmt"
result = "".join(dict.fromkeys(foo))

产生字符串 "mpt".在早期版本的 Python 中，您可以使用 collections.OrderedDict，它从 Python 2.7 开始可用.

resulting in the string "mpt". In earlier versions of Python, you can use collections.OrderedDict, which has been available starting from Python 2.7.

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