Adding column to dataframe in pandas by calculating length of another column

Question

I have one dataframe in which first coloumn is having names. Now I want to add length of that string as a second coloumn in dataframe

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

is the code for dataframe for example ... I want dataframe as

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

Answer 1

You can use 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

Or:

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