4. 选择一列数据，作为Series

 in[17]: movie = pd.read_csv('data/movie.csv')
 in[18]: #  选择director_name这列
         movie['director_name']
out[18]: 0           James Cameron
         1          Gore Verbinski
         2              Sam Mendes
         3       Christopher Nolan
         4             Doug Walker
                    ...        
         4911          Scott Smith
         4912                  NaN
         4913     Benjamin Roberds
         4914          Daniel Hsia
         4915             Jon Gunn
         Name: director_name, Length: 4916, dtype: object
 in[19]: #  也可以通过属性的方式选取
         movie.director_name
out[19]: 0           James Cameron
         1          Gore Verbinski
         2              Sam Mendes
         3       Christopher Nolan
         4             Doug Walker
                    ...        
         4911          Scott Smith
         4912                  NaN
         4913     Benjamin Roberds
         4914          Daniel Hsia
         4915             Jon Gunn
         Name: director_name, Length: 4916, dtype: object
#  查看类型
 in[20]: type(movie['director_name'])
out[20]: pandas.core.series.Series

更多

 in[21]: director = movie['director_name']
         #  查看选取的列的名字
         director.name
out[21]: 'director_name'

 in[22]: #  单列Series转换为DataFrame
         director.to_frame().head()
out[22]: 
    director_name
0   James Cameron
1   Gore Verbinski
2   Sam Mendes
3   Christopher Nolan
4   Doug Walker