通過計算另一列的長度將列添加到pandas中的數據框中

Question

我有一個數據框，其中第一個數組有名稱。現在我想在數據幀

list = ["apple","mango","banana","orange"] 
df=pd.DataFrame(list) 

添加一個字符串的長度作爲第二coloumn是數據框例如代碼... 我想作爲數據幀

 0 len 
0 apple 5 
1 mango 5 
2 banana 6 
3 ora  3 

Answer 1

您可以使用str.len：

import pandas as pd 


list = ["apple","mango","banana","orange"] 
df=pd.DataFrame(list) 

df['len'] = df.iloc[:,0].str.len() 
print df 
     0 len 
0 apple 5 
1 mango 5 
2 banana 6 
3 orange 6 

或者：

list = ["apple","mango","banana","orange"] 
df=pd.DataFrame(list, columns=['a']) 

df['len'] = df['a'].str.len() 
print df 
     a len 
0 apple 5 
1 mango 5 
2 banana 6 
3 orange 6