First, open up the REPL.

Remember, you’ll learn best if you type along with me.

There are three different types of numbers in Python: int for Integer, Float, and Complex.

# These are all integers
x = 4
y = -193394
z = 0
# These are all floats
x = 5.0
y = -3983.2
z = 0.
# This is a complex number
x = 42j

In Python, Integers and other simple data types are just objects under the hood. That means that you can create new ones by calling methods. You can provide either a number, or a string. This will come in handy later on in the course.

x = int(4)
y = int('4')
z = float(5.0)

Python also provides a decimal library, which has certain benefits over the float datatype. For more information, refer to the Python documentation.

Mathematical Operations

Numbers can be added together. If you add a float and an int, the resulting type will be a float.

If you divide two ints (integers), the result will be of type float.

Boolean Types

In Python, Booleans are of type bool. Surprisingly, the boolean types True and False are also numbers under the hood.

  • True is 1 under the hood.
  • False is 0 under the hood.

That means you can do silly things, like add two Boolean numbers together, but I’ll cover why this is a useful Python feature later in the course.