Python
Which of the following is invalid variable in Python?

__a = 1
__str__ = 1
_a = 1
None of the mentioned

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Python
What is the use of duck typing?

More restriction on the type values that can be passed to a given method
Less restriction on the type values that can be passed to a given method
Makes the program code smaller
No restriction on the type values that can be passed to a given method

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