Python 3.x email.message library: trying to remove specific header content such as bcc

Question

The library functions for reading headers from an RFC822 compliant file are working just fine for me, for example:

    allRecips = []
    for hdrName in ['to', 'cc', 'bcc']:
        for i in email.utils.getaddresses(msg.get_all(hdrName, [])):
            r = {
                'address': {
                    'name': i[0],
                    'email': i[1]
                }
            }
            allRecips.append(r)

I now want to remove the bcc recipients from the msg structure in the above example. I looked at del_param() for this, but couldn't figure out what to pass in. Is there a good way to delete any bcc headers that may be present (1 or more)?

Answer 1

a list has the remove method which searches for the item so the order is not important.

I believe you could accomplish the goal using this code:

for header in msg._headers:
    if header[0].lower() == 'bcc':
        msg._headers.remove(header)

Answer 2

I found a way to do it. The trick was to work backwards through the array of headers using reversed(), to avoid issues where content 'moves' in the array.

# Remove any bcc headers from the message payload. Work backwards, as deletion changes later indices.
for i in reversed(range(len(msg._headers))):
    hdrName = msg._headers[i][0].lower()
    if hdrName == 'bcc':
        del(msg._headers[i])