def func_with_list(arr = []):
arr.append("foo")
print(arr)
return arr
func_with_list([1,2,3])
func_with_list()
func_with_list([1,2,3])
func_with_list()
ZGVmIGZ1bmNfd2l0aF9saXN0KGFyciA9IFtdKToKICBhcnIuYXBwZW5kKCJmb28iKQogIHByaW50KGFycikKICByZXR1cm4gYXJyCgoKZnVuY193aXRoX2xpc3QoWzEsMiwzXSkKZnVuY193aXRoX2xpc3QoKQpmdW5jX3dpdGhfbGlzdChbMSwyLDNdKQpmdW5jX3dpdGhfbGlzdCgpCg==