Why are local variable names beginning with an underscore?
A) They are used to indicate a private variables of a class.
B) They confuse the interpreter.
C) They are used to indicate global variables.
D) They slow down execution.
Answer: A. They are used to indicate a private variable of a class.
As Python has no concept of private variables, leading underscores are used to indicate variables that must not be accessed from outside the class.
Additional information
What mean to use underscore before the variable name?
_name = "Hello"
It doesn’t mean anything. It is a common naming convention for private member variables to keep them separated from methods and public properties.