Variable Declaration in Python
Used to declare a variable which holds a value.
variable_name = value variable_name = None #to initialize without a value
Variables in Python are dynamically typed, which means a type does not have to be specified, and the variable's type can be changed.
Variable scoping in Python follows the LEGB rule, which is Local (assigned within a function), Enclosing function local (name in local scope of all enclosing functions), Global (available in the entire file), and Built-In (built into the Python library).
length = 5
An informal introduction to Python - Python Documentation