I ran into a similar situation like the following (ipython session). Can anyone please explain why the behavior? Thanks in advance.
In [11]: def foo(b=[]): ....: b.append(3) ....: return b ....: In [12]: foo() Out[12]: [3] In [13]: foo() Out[13]: [3, 3] In [14]: foo([]) Out[14]: [3] In [15]: foo([]) Out[15]: [3] -- http://mail.python.org/mailman/listinfo/python-list
