Python Tutorials · Python Numbers

Python Numbers

Learn all about Python Numbers in this comprehensive tutorial.

5 min read beginner

Python Data Types

Python Casting

•There are three numeric types in Python:
•Int, or integer, is a whole number, positive or negative, without decimals, of unlimited length.
•Float, or "floating point number" is a number, positive or negative, containing one or more decimals.
•Complex numbers are written with a "j" as the imaginary part:
•You can convert from one type to another with the int(), float(), and complex() methods:
•Python does not have a random() function to make a random number, but Python has a built-in module called random that can be used to make random numbers:

Python Numbers

There are three numeric types in Python:

int
float
complex

Variables of numeric types are created when you assign a value to them:

python

val_1 = 1    
  # inty = 2.8  # floatz = 1j   # complex

To verify the type of any object in Python, use the type() function:

python

print(type(val_1))print(type(val_2))print(type(z))

Int

Int, or integer, is a whole number, positive or negative, without decimals, of unlimited length.

python

val_1 = 1y = 35656222554887711z = 
  -3255522print(type(val_1))print(type(val_2))print(type(z))

Float

Float, or "floating point number" is a number, positive or negative, containing one or more decimals.

python

val_1 = 1.10y = 1.0z = -35.59print(type(val_1))print(type(val_2))print(type(z))

Float can also be scientific numbers with an "e" to indicate the power of 10.

python

val_1 = 35e3y = 12E4z = -87.7e100print(type(val_1))print(type(val_2))
  print(type(z))

Complex

Complex numbers are written with a "j" as the imaginary part:

python

val_1 = 3+5jy = 5jz = -5jprint(type(val_1))print(type(val_2))
  print(type(z))

Type Conversion

You can convert from one type to another with the int(), float(), and complex() methods:

python

val_1 = 1    # inty = 2.8  # floatz = 1j   # complex#convert from int to float:
  a = float(val_1)#convert from float to int:
  b = int(val_2)#convert from int to complex:c = complex(val_1)print(a)print(b)
  print(c)print(type(a))print(type(b))
  print(type(c))

Note: Note: You cannot convert complex numbers into another number type.

Random Number

Python does not have a random() function to make a random number, but Python has a built-in module called random that can be used to make random numbers:

python

import randomprint(random.randrange(1, 10))

In our Random Module Reference you will learn more about the Random module.

Module quiz

2 questions

Which of the following is true about Python Numbers?

It is strictly typedIt is evaluated at runtimeIt requires explicit memory managementIt is deprecated

What is the most common pitfall when working with Python Numbers?

SyntaxErrorIndentationErrorNameErrorTypeError

Answer all questions to submit.

Python Data Types

Python Casting

Python Numbers

AI Summary

Python Numbers

Int

Float

Complex

Type Conversion

Random Number

Module quiz