How can I remove all non-numeric characters from all the values in a particular column in pandas dataframe?

Question

I have a dataframe which looks like this:

     A       B           C
1   red78   square    big235
2   green   circle    small123
3   blue45  triangle  big657         


        

Answer 1

You can also do this via a lambda function with str.isdigit:

import pandas as pd

df = pd.DataFrame({'Name': ['John5', 'Tom 8', 'Ron 722']})

df['Name'] = df['Name'].map(lambda x: ''.join([i for i in x if i.isdigit()]))

#   Name
# 0    5
# 1    8
# 2  722