explain in brief regarding identifiers
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Identifiers are user defined names given to a variable, function, class, module.
e.g: Fibonacci_num = 5 or def fibonacci or class fibonacci.
They are case sensitive.
e,g: fibonacci, Fibonacci , FIBOnacci these are 3 different identifiers.
Identifiers should be given a appropriate naming according to there use case.
Some valid identifiers:
num
num_
num_1
__num
_1_num
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