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From: "Ivan Evstegneev" <webmailgroups@gmail.com>
To: <python-list@python.org>
Subject: Function Defaults - avoiding unneccerary combinations of arguments at input
Date: Wed, 25 Mar 2015 19:43:34 +0200
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Xref: csiph.com comp.lang.python:87955

Hello all , 


Just a little question about function's default arguments.

Let's say I have this function:

def  my_fun(history=False, built=False, current=False, topo=None,
full=False, file=None):
	if currnet and full:
		do something_1
	elif current and file:
		do something_2
	elif history and full and file:
		do something_3
	

	...... some code here..............

and so on... 

I won't cover all the possibilities here (actually I don't use all of them
^_^).

The question is about avoiding the response for unnecessary combinations? 

For instance, if user will call function this way: 


>>>my_fun(current=True, full=True, topo='some str', file="some_file")

That will lead to function's misbehavior. As a particular case it will
choose "current and full" condition. 


What is the common accepted way to deal with such unwanted situations? 


Thanks a lot in advance,

Ivan.