Flatten a list/tuple and Call a function with tuples

Jeff jeffober at gmail.com
Wed Jul 25 19:33:13 CEST 2007

Here's a quick flatten() function:

def flatten(obj):
    if type(obj) not in (list, tuple, str):
        raise TypeError("String, list, or tuple expected in
    if len(obj) == 1:
        if type(obj[0]) in (tuple, list):
            return flatten(obj[0])
            return [obj[0]]
        return [obj[0]] + flatten(obj[1:])

x = [1, 2, (3, 4)]
y = (1, 2, [3, 4])
z = "It even works with strings!"
d = {"foo": "bar", "baz": "bat"}

print flatten(x)
print flatten(y)
print flatten(z)
print flatten(d)

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