tree c1c449e5616aba55928e4bd07a5384353caf9293
parent b86b63a8d6895fe6725be4b4a96e24428025cdc3
author Andrew Jeffery <andrew@aj.id.au> 1526341870 +0930
committer Andrew Jeffery <andrew@aj.id.au> 1526341870 +0930

server: Rework methods to avoid mutable default arguments

Mutable objects as default arguments in function or method declarations
are only assigned once over the lifetime of the function declaration
(i.e. are not assigned per function/method *invocation*). Rework such
declarations to assign None (which is immutable), and test for None in
the function/method body to assign a per-instance object.

The side-effects of mutable default arguments are explored here:

http://docs.python-guide.org/en/latest/writing/gotchas/#mutable-default-arguments

Change-Id: Id963cdecba63f7072e621208e1a3173e1646ddf1
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>