Gilles Ganault <nos...@nospam.com> writes:
> I'd like to go through a list of e-mail addresses, and extract those
> that belong to well-known ISP's. For some reason I can't figure out,
> Python shows the whole list instead of just e-mails that match:
>
> ======= script
> test = "t...@gmail.com"
> isp = ["gmail.com", "yahoo.com"]
> for item in isp:
> if test.find(item):
> print item
> ======= output
> gmail.com
> yahoo.com
> =======
>
> Any idea why I'm also getting "yahoo.com"?
You've had answers on the “why” question.
Here's a suggestion for a better way that doesn't involve ‘find’:
>>> known_domains = ["example.com", "example.org"]
>>> test_address = "t...@example.com"
>>> for domain in known_domains:
... if test_address.endswith("@" + domain):
... print domain
...
example.com
>>>
If all you want is a boolean “do any of these domains match the
address”, it's quicker and simpler to feed an iterator to ‘any’
(first introduced in Python 2.5), which short-cuts by exiting on the
first item that produces a True result:
>>> known_domains = ["example.com", "example.org"]
>>> test_address = "t...@example.com"
>>> any(test_address.endswith("@" + domain) for domain in known_domains)
True
>>> test_address = "tin...@example.net"
>>> any(test_address.endswith("@" + domain) for domain in known_domains)
False
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Ben Finney
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