Tuple passed to function recognised as string

[Mike314]

Hello,

   I have following code:

def test_func(val):
    print type(val)

test_func(val=('val1'))
test_func(val=('val1', 'val2'))

The output is quite different:

<type 'str'>
<type 'tuple'>

Why I have string in the first case?

Thanks.
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