Python: Identifiers
Python Identifiers:
All the variables, class, object, functions, lists, dictionaries etc. in Python are together termed as Python Identifiers. Identifiers are the basis of any Python program. Almost every Python Code uses some or other identifiers.
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Rules for using Python Identifiers:
- An identifier name should not be a keyword.
- An identifier name can begin with a letter or an underscore only.
- An identifier name can contain both numbers and letters along with underscores (A-z, 0-9, and _).
- All succeeding characters must be alphabets or digits.
- The first
character must be an alphabet (uppercase or lowercase) or can be an
underscore.
- An
identifier cannot start with a digit.
- No special
characters like!, @, #, $, % or punctuation symbols is allowed except the
underscore”_”.
- No two Successive underscores are allowed.
- An identifier name in Python is case-sensitive i.e., sum and Sum are two different identifier.
Example of valid identifier names are sum, _my_var, num1, r,
var_ 2
, First, etc.
Examples of invalid identifier names are 1num, my-var, %check, Basic Sal, H#R&A, etc.