Python Variable Naming Rules

In Python, variable names must follow certain rules to be valid. Here are the general rules for naming variables in Python:

  1. Variables can only contain letters (both uppercase and lowercase), digits, and underscores (_).
  2. Variables cannot begin with a digit. They must begin with a letter or an underscore.
  3. Variable names are case-sensitive, meaning that “myVar” and “myvar” are two different variables.
  4. Python has a set of reserved keywords that cannot be used as variable names, such as “if,” “else,” “for,” “while,” etc.
  5. Variable names should be descriptive and meaningful, and should not be too long or too short.

Examples of valid variable names in Python:

my_var = 10
myVar = 20
_abc123 = "hello"

Examples of invalid variable names in Python:

1abc = 10  # variable cannot begin with a digit
my-var = 20  # variable cannot contain hyphens
for = 30  # "for" is a reserved keyword and cannot be used as a variable name