我一直在 python 中使用 pandas 来提取信息。我的数据框的一列中有以下标题:
0
In & Out (1997)
Simple Plan, A (1998)
Retro Puppetmaster (1999)
Paralyzing Fear: The Story of Polio in America, A (1998)
Old Man and the Sea, The (1958)
Body Shots (1999)
Coogan's Bluff (1968)
Seven Samurai (The Magnificent Seven) (Shichinin no samurai) (1954)
Search for One-eye Jimmy, The (1996)
Funhouse, The (1981)
我想将这些标题的年份放入一个新专栏中。我遇到的问题是，如果我将“(”作为分隔符进行拆分，如您在第 8 行中看到的那样，它会在那里拆分。那么我如何在 (yyyy) 处拆分以形成该年份的新列看起来像这样？
0 1
In & Out 1997
Simple Plan, A 1998
Retro Puppetmaster 1999
Paralyzing Fear:... 1998
Old Man and the S... 1958
Body Shots 1999
Coogan's Bluff 1968
Seven Samurai (T... 1954
Search for One-ey... 1996
Funhouse, The 1981
最佳答案
您可以使用展开:
df['year'] = df.iloc[:,0].str.extract('\((\d{4})\)'',expand=False)
df
Out[381]:
0 year
0 In & Out (1997) 1997
1 Simple Plan, A (1998) 1998
2 Retro Puppetmaster (1999) 1999
3 Paralyzing Fear: The Story of Polio in America... 1998
4 Old Man and the Sea, The (1958) 1958
5 Body Shots (1999) 1999
6 Coogan's Bluff (1968) 1968
7 Seven Samurai (The Magnificent Seven) (Shichin... 1954
8 Search for One-eye Jimmy, The (1996) 1996
9 Funhouse, The (1981) 1981
关于Python- Pandas : extract a number from column into new column，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44464118/