从字符串中删除单词

Question

如果我有'the quick brown fox'这样的字符串，如何从原始字符串中删除连续的单词，例如“quick brown”以获取'the fox'？我试过了strip()，但没有用，我也不确定还能做些什么。

Answer 1

使用str.replace()：

In [2]: strs='the quick brown fox'

In [3]: strs.replace('quick brown','')
Out[3]: 'the  fox'

In [4]: " ".join(strs.replace('quick brown','').split())
Out[4]: 'the fox'                          #single space between 'the' and 'fox'

help()上的

str.replace()：

S.replace(old, new[, count]) -> str

Return a copy of S with all occurrences of substring
old replaced by new.  If the optional argument count is
given, only the first count occurrences are replaced.

Answer 2

您无法从原始字符串中删除字词。字符串是不可改变的;见here：

  

“字符串和元组是不可变的序列类型：创建后不能修改此类对象。”

使用replace会返回字符串的副本。

Answer 3

mystring.replace(" quick brown ", " ", 1)