12.2.2 AddressList Objects
An AddressList instance has the following methods:
- __len__ (name)
Return the number of addresses in the address list.
- __str__ (name)
Return a canonicalized string representation of the address list.
Addresses are rendered in "name" <host@domain> form, comma-separated.
- __add__ (name)
Return an AddressList instance that contains all addresses in
both AddressList operands, with duplicates removed (set union).
- __sub__ (name)
Return an AddressList instance that contains every address in the
left-hand AddressList operand that is not present in the right-hand
address operand (set difference).
Finally, AddressList instances have one public instance variable:
A list of tuple string pairs, one per address. In each member, the
first is the canonicalized name part of the address, the second is the
route-address (@-separated host-domain pair).
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