Hi, I'm trying to define a function that has an optional parameter which should be an empty list whenever it isn't given. However, it takes as value the same value as the last time the function was executed. What is the reason of this behaviour? How does python deal with default values (i.e. when are they assigned/created)?
Thanks :) >>> def a(foo=[]): ... foo.append(1) ... print foo ... >>> a() [1] >>> a() [1, 1] >>> a() [1, 1, 1] >>> a() [1, 1, 1, 1] >>> a() [1, 1, 1, 1, 1] >>> a() [1, 1, 1, 1, 1, 1] -- http://mail.python.org/mailman/listinfo/python-list
