CODEWITHSUNDEEP
python-3.x
jirostatic
jirostatic

Reputation: 17

Python 3.x - How to check if "From:" header exists in an email file?

Since has_keys() function is removed in Python 3 and above, I don't know what code to use to check if a "From: " header exist in an email file.

Here is my current snippet: 

with open(emlFile, 'rb') as fp:
        headers = BytesParser(policy=policy.default).parse(fp)
        if 'From:' in headers:
            str = headers['from']

I used in instead of has_keys('from') since that is what I saw from other threads in StackOverflow

Upvotes: 0

Views: 623

Answers (1)

Łukasz Rogalski
Łukasz Rogalski

Reputation: 23223

Quoting official Python docs (emphasis mine):

BytesParser.parse:

Read all the data from the binary file-like object fp, parse the resulting bytes, and return the message object. fp must support both the readline() and the read() methods on file-like objects.

Since result of parse is Message instance, let's check that class docs:

__contains__(name):

Return true if the message object has a field named name. Matching is done case-insensitively and name should not include the trailing colon. Used for the in operator, e.g.:

if 'message-id' in myMessage:
   print('Message-ID:', myMessage['message-id'])

Your check includes trailing colon and is invalid according to docs. Valid check is:

if 'from' in headers:
    do_something()

Upvotes: 1

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