class email.headerregistry.SingleAddressHeader A subclass of AddressHeader that adds one additional attribute:

name The name of the header (the portion of the field before the ‘:’). This is exactly the value passed in the

MimeTypes.guess_all_extensions(type, strict=True) Similar to the guess_all_extensions() function, using the tables

header_factory A callable that takes two arguments, name and value, where name is a header

binascii.b2a_base64(data) Convert binary data to a line of ASCII characters in base64 coding. The return value is the converted

pop(key, default=None) Return a representation of the message corresponding to key and delete the message. If no such

binascii.crc32(data[, value]) Compute CRC-32, the 32-bit checksum of data, starting with an initial CRC of value

mimetypes.guess_type(url, strict=True) Guess the type of a file based on its filename or URL, given by url. The return

email.utils.format_datetime(dt, usegmt=False) Like formatdate, but the input is a

email.utils.mktime_tz(tuple) Turn a 10-tuple as returned by parsedate_tz() into a UTC timestamp (seconds since