Python Identifiers
Python Identifier is the name we give to identify a variable, function, class, module or other object.
Rules to Define an Identifier
1. It should not start with a number but after starting it with a valid symbol you use number happily.
1num = 10 (Invalid)
num1 = 10 (valid)
2. It can never be a keyword.
True = 10 (Invalid because True is predefined word)
TRUE = 10 (Valid)
3. Identifiers are case sensitive.
num = 10
NUM = 20
nUM = 30
Num = 40 (All variable are valid and different)
4. It can not contain any special symbol or hidden symbol.
num 1 = 10 (Invalid because of hidden symbol(space)
num$1 = 10 (Invalid becasue of special symbol($)
5. It can contain only a single special symbol that is _.
num_1 (Valid)
Python Keywords
Python has a set of predefined words which you can use but can not alter.
Note : There are total 33 keywords available in python
