仅替换第一次出现的字符串？

I have something like this:

我有这样的事情：

text = 'This text is very very long.'
replace_words = ['very','word']

for word in replace_words:
    text = text.replace('very','not very')

I would like to only replace the first 'very' or choose which 'very' gets overwritten. I'm doing this on much larger amounts of text so I want to control how duplicate words are being replaced.

我想只替换第一个'非常'或选择哪个'非常'被覆盖。我在更大量的文本上这样做，所以我想控制重复单词的替换方式。

3 个解决方案

#1

text = text.replace("very", "not very", 1)

>>> help(str.replace)
Help on method_descriptor:

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

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

#2

text = text.replace("very", "not very", 1)

The third parameter is the maximum number of occurrences that you want to replace.
From the documentation for Python:

第三个参数是要替换的最大出现次数。从Python的文档：

string.replace(s, old, new[, maxreplace])
Return a copy of string s with all occurrences of substring old replaced by new. If the optional argument maxreplace is given, the first maxreplace occurrences are replaced.

string.replace（s，old，new [，maxreplace]）返回字符串s的副本，其中所有出现的substring old都替换为new。如果给出了可选参数maxreplace，则替换第一个maxreplace事件。

#3

From http://docs.python.org/release/2.5.2/lib/string-methods.html :

来自http://docs.python.org/release/2.5.2/lib/string-methods.html：

replace( old, new[, count])
Return a copy of the string with all occurrences of substring old replaced by new. If the optional argument count is given, only the first count occurrences are replaced.

replace（old，new [，count]）返回字符串的副本，其中所有出现的substring old都替换为new。如果给出可选参数计数，则仅替换第一次计数。

I didn't try but I believe it works

我没试过，但我相信它有效