Python
Why are local variable names beginning with an underscore discouraged in Python Programming?

they slow down execution
they confuse the interpreter
they are used to indicate a private variables of a class
they are used to indicate global variables

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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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