Loading lesson path
Concept visual
Start at both ends
Overview
There are three numeric types in Python: int float complex Variables of numeric types are created when you assign a value to them:
Example x = 1
Formula
# int y = 2.8 # float z = 1j # complexTo verify the type of any object in Python, use the type() function:
print(type(x))
print(type(y))
print(type(z))Int, or integer, is a whole number, positive or negative, without decimals, of unlimited length.
Formula
x = 1 y = 35656222554887711 z =-3255522 print(type(x))
print(type(y))
print(type(z))Float, or "floating point number" is a number, positive or negative, containing one or more decimals.
x = 1.10 y = 1.0 z = -35.59 print(type(x))
print(type(y))
print(type(z))
Float can also be scientific numbers with an "e" to indicate the power of 10.x = 35e3 y = 12E4 z = -87.7e100 print(type(x))
print(type(y))
print(type(z))Complex numbers are written with a "j" as the imaginary part:
x = 3+5j y = 5j z = -5j print(type(x))
print(type(y))
print(type(z))You can convert from one type to another with the int(), float(), and complex() methods:
Convert from one type to another:
Formula
x = 1 # int y = 2.8 # float z = 1j # complex#convert from int to float:
Formula
a = float(x)#convert from float to int:
Formula
b = int(y)#convert from int to complex:
Formula
c = complex(x)print(a)
print(b)
print(c)
print(type(a))
print(type(b))
print(type(c))You cannot convert complex numbers into another number type.
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:
Import the random module, and display a random number from 1 to 9:
import random print(random.randrange(1, 10))Random Module Reference you will learn more about the Random module.