How to split a list

I have a textfile and the input is:

• abcdefg@hi

• jklmnop@qr

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In the following I read every line into a list while stripping the \n:

with open(file) as f:
    return [email.strip() for email in f]

Output after printing the list: [abcdefg@hi, jklmnop@qr]

BUT I want to get only the part before the @ like abcdefg. I need to use split('@') and then get [0]. But in which line in the with-open-code above I need to split it?

Another question: Does the expression [email.strip() for email in f] has any specific name?

>Solution :

I would suggest using re.findall here:

with open(file) as f:
    data = f.read()
    emails = re.findall(r'(\S+)@\S+', data)