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Python Variables


Creating Variables

Variables are containers for storing data values.

Unlike other programming languages, Python has no command for declaring a variable.

A variable is created the moment you first assign a value to it.

Example

x = 5
y = "John"
print(x)
print(y)
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Variables do not need to be declared with any particular type and can even change type after they have been set.

Example

x = 4 # x is of type int
x = "Sally" # x is now of type str
print(x)
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String variables can be declared either by using single or double quotes:

Example

x = "John"
# is the same as
x = 'John'
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Variable Names

A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). Rules for Python variables:
  • 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)

Remember that variable names are case-sensitive



Assign Value to Multiple Variables

Python allows you to assign values to multiple variables in one line:

Example

x, y, z = "Orange", "Banana", "Cherry"
print(x)
print(y)
print(z)
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And you can assign the same value to multiple variables in one line:

Example

x = y = z = "Orange"
print(x)
print(y)
print(z)
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Output Variables

The Python print statement is often used to output variables.

To combine both text and a variable, Python uses the + character:

Example

x = "awesome"
print("Python is " + x)
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You can also use the + character to add a variable to another variable:

Example

x = "Python is "
y = "awesome"
z =  x + y
print(z)
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For numbers, the + character works as a mathematical operator:

Example

x = 5
y = 10
print(x + y)
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If you try to combine a string and a number, Python will give you an error:

Example

x = 5
y = "John"
print(x + y)
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Test Yourself With Exercises

Exercise:

Create a variable named carname and assign the value Volvo to it.

 = ""

Start the Exercise