What is a Python identifier?
A Python identifier is the name of a variable, function, class, module or object.
An identifier can start with a letter A-Z or a-z or an underscore.
An identifier can includes zero or more letter, number 0-9 and an underscore
Class name starts with uppercase letter and other letters are lower case
An identifier starts with a single underscore is used for private identifier
An identifier with two underscores is used for strongly private identifier
An identifer with prefix and suffix with two underscore indicates system identifier
Date Time Format in Python
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