Basically, Python has no command to Declare a Variable. A Variable is created as soon as you assign any value to it. Whether it is numeric, String, Float, Boolean or any kind.

Variables do not need to be declared with any particular type, and can even change type after they have been set.

*** Variable names in Python are case-sensitive.

A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume)

Following are some rules to create a variable name:

• A variable name must start with a letter or the underscore character
• A variable name cannot start with a number
• A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
• Variable names are case-sensitive (age, Age and AGE are three different variables)

Example 01:

x = 5
y = "John"
print(x)
print(y)

Example 02:

x = 4       # x is of type int
x = "Sally" # x is now of type str
print(x)

Example 03:

x = str(3)    # x will be '3'
y = int(3)    # y will be 3
z = float(3)  # z will be 3.0

type() function:

You can get variable type using type() function.

Example:

x = 5
y = "John"
print(type(x))
print(type(y))