Python bug or feature? I hate it.

raise-and-default-param.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

def check(v, trace=[]):
    print("check: entered")

    if trace:
        print("trace: " + str(trace))

    try:
        trace.append(1)
        raise Exception()
        trace.pop()
    except:
        pass

check(1)
check(2)