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

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

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Python
What is the use of duck typing?

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

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