Basic Python 5: Python Keywords and Identifiers

Published: 12 September 2022
on channel: Testing Tutorialspoint

Python Keywords and Identifiers:
--------------------------------
Keywords:

Keywords are the reserved words in Python.

We cannot use a keyword as a variable name, function name or any other identifier.

keywords are case sensitive.

All the keywords except True, False and None are in lowercase and they must be written as they are.

False await else import pass
None break except in raise
True class finally is return
and continue for lambda try
as def from nonlocal while
assert del global not with
async elif if or yield

Identifiers:
------------
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 myClass, var_1 and print_this_to_screen, all are valid example.

ex: my_first_varaible

2. An identifier cannot start with a digit. 1variable is invalid, but variable1 is a valid name.

3. Keywords cannot be used as identifiers.
ex:
global = 1

4. We cannot use special symbols like !, @, #, $, % etc. in our identifier.
ex:
a@ = 0

5. An identifier can be of any length.
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