我有一个 Python 2.7 Pandas Dataframe，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字符串“?v=”的一部分，例如“URL”列中的“ppp”。我尝试使用正常的替换命令：
df['URL'] = df['URL'].str.replace('?v=', 'ppp')
但出现以下错误。
error: nothing to repeat.
当我尝试仅替换一个字符时，例如：
df['URL'] = df['URL'].str.replace('?', 'ppp')
效果很好。为什么当我尝试替换字符串 "?v=" 时它不起作用？
你需要逃离? by \:
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=...
另一种解决方案是Series.replace http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.replace.html:
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=...
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