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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getaddresses (addr):
 """Return list of email addresses from given field value."""

    parsed = [mail for name, mail in AddressList(addr).addresslist if mail]
    if parsed:
        addresses = parsed
    elif addr:
        # we could not parse any mail addresses, so try with the raw string
        addresses = [addr]
    else:
        addresses = []
    return addresses