Replace a pattern in column of a csv file using Python

Question

I am looking for some help with editing CSV in python. I have a file in below format

Account	InstanceId	InstanceName	InstanceType	Platform	Status	AvailabilityZone	PrivateIpAddress	publicIpAdress	Owner
12345678901	i-0abcdef1234567890	Test123	t3a.micro	windows	stopped	ap-southeast-2a	10.0.0.100		arn:aws:sts::12345678901:user/test-user
98765432109	i-0987654321abcdefg	test345	t2.nano	Linux	running	ap-southeast-2b	10.0.0.200	99.99.99.100	arn:aws:sts::98765432109:assumed-role/testrole/user@example.com
98765432109	i-abcdefghij01234899	test987	t2.nano	windows	running	ap-southeast-2b	10.0.0.201

I would like to edit this file in place and and have the resulting file in below format

Account	InstanceId	InstanceName	InstanceType	Platform	Status	AvailabilityZone	PrivateIpAddress	publicIpAdress	Owner
12345678901	i-0abcdef1234567890	Test123	t3a.micro	windows	stopped	ap-southeast-2a	10.0.0.100		test-user
98765432109	i-0987654321abcdefg	test345	t2.nano	Linux	running	ap-southeast-2b	10.0.0.200	99.99.99.100	user@example.com
98765432109	i-abcdefghij01234899	test987	t2.nano	windows	running	ap-southeast-2b	10.0.0.201

I tried a few things with no luck and would really appreciate if you can help me with this. Thanks in advance.

Answer 1

Use:

df['Owner'] = df['Owner'].str.split('/').str[-1]

Demonstration:

df = pd.DataFrame({'Owner': ['arn:aws:sts::12345678901:user/test-user']})
df['Owner'].str.split('/').str[-1]

Output: