Python Pandas: 如何替换包含“?”的字符串

Question

我有一个 Python 2.7 Pandas 数据框，如下所示：

Id      Title             URL
Id-1    Bruce Almighty    https://www.youtube.com/watch?v=5VGyTOGxyVA
Id-2    Superhero Movie   https://www.youtube.com/watch?v=3BnXz-7-y-o
Id-3    Taken             https://www.youtube.com/watch?v=vjbfiOERDYs
Id-4    Forest Gump       https://www.youtube.com/watch?v=eJFkCJySHdY&t=524s

我想用其他字符串替换部分字符串“?v=”，例如 "ppp"来自 "URL" 列。我用普通的替换命令试过：

df['URL'] = df['URL'].str.replace('?v=', 'ppp')

但出现以下错误。

error: nothing to repeat.

当我尝试只替换一个字符时，例如：

df['URL'] = df['URL'].str.replace('?', 'ppp')

它工作正常。为什么当我尝试替换字符串“?v=”时它不起作用？

Answer 1

您需要通过 \:

逃脱 ?

df['URL'] = df['URL'].str.replace('\?v=', 'ppp')
print (df)
     Id            Title                                                URL
0  Id-1   Bruce Almighty        https://www.youtube.com/watchppp5VGyTOGxyVA
1  Id-2  Superhero Movie        https://www.youtube.com/watchppp3BnXz-7-y-o
2  Id-3            Taken        https://www.youtube.com/watchpppvjbfiOERDYs
3  Id-4      Forest Gump  https://www.youtube.com/watchpppeJFkCJySHdY&t=...

Series.replace的另一个解决方案：

df['URL'] = df['URL'].replace('\?v=', 'ppp', regex=True)
print (df)
     Id            Title                                                URL
0  Id-1   Bruce Almighty        https://www.youtube.com/watchppp5VGyTOGxyVA
1  Id-2  Superhero Movie        https://www.youtube.com/watchppp3BnXz-7-y-o
2  Id-3            Taken        https://www.youtube.com/watchpppvjbfiOERDYs
3  Id-4      Forest Gump  https://www.youtube.com/watchpppeJFkCJySHdY&t=...

Answer 2

或者您可以指示 Pandas 您正在执行标准（不是 RegEx）替换：

df['URL'] = df['URL'].str.replace('?v=', 'ppp', regex=False)

Python Pandas: 如何替换包含“?”的字符串

Python Pandas: How to replace string contain "?"

string

str-replace

python-2.7

pandas