Or, (to add needed recursion to your simple loop):
def flatten(x):
"Modified in-place flattening"
for i in range(len(x)):
if isinstance(x[i], list):
x[i:i+1] = flatten(x[i])
return xThis version modifies in-place (as yours does), which may or may not be what you want, depending on whether or not you need both the flat and un-flat versions. -- http://mail.python.org/mailman/listinfo/python-list
