基于pandas中expand的作用详解-创新互联

expand表示是否把series类型转化为DataFrame类型

下面代码中的ｎ表示去掉下划线"_"的数量

代码如下：

import numpy as np
import pandas as pd
s2 = pd.Series(['a_b_c_f_j', 'c_d_e_f_h', np.nan, 'f_g_h_x_g'])
print("-----------------------------------")
print(s2.str.split('_'))
print("-----------------------------------")
print(s2.str.split('_').str.get(1))
print("-----------------------------------")
print(s2.str.split('_').str[1])
print("---------------expand=True--------------------")
expand1=s2.str.split('_', expand=True)
print(expand1)
print(type(expand1))
print("---------------expand=False--------------------")
expand2=s2.str.split('_', expand=False)
print(expand2)
print(type(expand２))
print("##########################################################")
print("---------------expand=True,n=1--------------------")
expand1=s2.str.rsplit('_', expand=True,n=1)
print(expand1)
print("---------------expand=False,n=1--------------------")
expand2=s2.str.rsplit('_', expand=False,n=1)
print(expand2)