How to find a string that contains a given substring in a list

Question

I'm curious to know the most "pythonic" way to check if there is an item in a list of strings that contains a given substring.

For example, say we have a list of email addresses:

['email1@abc.com', 'anotheremail@grandmasSMTPserver.net', 'myboss@dontemailme.org']

and we need to send an email to most of the emails in this list, but not all of them. What is the simplest (read: most "pythonic") way to check for a list element that contains the substring, say, 'dontemailme.org' and then remove it from the list?

I'm mainly concerned with determining whether an item in the list contains the substring, ideally which item in particular, so that I can make corresponding adjustments to the list.

I come from a C++ background so my initial thought is to use a for loop with an if statement to check but I am often surprised at the flexibility of Python.

Answer 1

You can use list comprehension :

emails = ['email1@abc.com', 'anotheremail@grandmasSMTPserver.net', 'myboss@dontemailme.org']
output_list = [email for email in emails if 'dontemailme.org' not in email]

print(output_list) # output: ['email1@abc.com', 'anotheremail@grandmasSMTPserver.net']

Answer 2

filter is one way:

filtered = filter(lambda email: 'dontemailme.org' not in email, emails)

Answer 3

I would use a list comprehension:

emails = ['email1@abc.com', 'anotheremail@grandmasSMTPserver.net', 'myboss@dontemailme.org']    
filtered_emails = [email for email in emails if "dontemailme.org" not in email]