What is a python keywords

Keywords are the reserved words in Python.
We cannot use a keyword as a variable name, function name or any other identifier. They are used to define the syntax and structure of the Python language.
In Python, keywords are case sensitive.
There are 33 keywords in Python 3.7. This number can vary slightly in the course of time.
All the keywords except TrueFalse and None are in lowercase and they must be written as it is. The list of all the keywords is given below.
Keywords in Python

Python Identifiers

An identifier is a name given to entities like class, functions, variables, etc. It helps to differentiate one entity from another.

Rules for writing identifiers

  1. Identifiers can be a combination of letters in lowercase (a to z) or uppercase (A to Z) or digits (0 to 9) or an underscore _. Names like myClassvar_1 and print_this_to_screen, all are a valid examples.
  2. An identifier cannot start with a digit. 1variable is invalid, but variable1 is perfectly fine.
  3. Keywords cannot be used as identifiers.
    1. >>> global = 1
    2. File "<interactive input>", line 1
    3. global = 1
    4. ^
    5. SyntaxError: invalid syntax
  4. We cannot use special symbols like !@#$% etc. in our identifier.
    1. >>> a@ = 0
    2. File "<interactive input>", line 1
    3. a@ = 0
    4. ^
    5. SyntaxError: invalid syntax
  5. Identifier can be of any length.

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