Remove ends of string entries in pandas DataFrame column

Question

I have a pandas Dataframe with one column a list of files

import pandas as pd
df = pd.read_csv(\'fname.csv\')

df.head()

filename    A    B    C
fn1.txt   2         


        

Answer 1

You may want:

df['filename'] = df.apply(lambda x: x['filename'][:-4], axis = 1)