Python Tutorials · Python Casting

Python Casting

Learn all about Python Casting in this comprehensive tutorial.

5 min read beginner

•There may be times when you want to specify a type on to a variable.

Specify a Variable Type

There may be times when you want to specify a type on to a variable. This can be done with casting. Python is an object-orientated language, and as such it uses classes to define data types, including its primitive types.

Casting in python is therefore done using constructor functions:

int() - constructs an integer number from an integer literal, a float literal (by removing all decimals), or a string literal (providing the string represents a whole number)
float() - constructs a float number from an integer literal, a float literal or a string literal (providing the string represents a float or an integer)
str() - constructs a string from a wide variety of data types, including strings, integer literals and float literals

python

val_1 = int(1)   # val_1 will be 1
val_2 = int(2.8) # val_2 will be 2
z = int("3") # z will be 3

python

val_1 = float(1)     # val_1 will be 1.0
val_2 = float(2.8)   # val_2 will be 2.8
z = float("3")   # z will be 3.0
w = float("4.2") # w will be 4.2

python

val_1 = str("s1") # val_1 will be 's1'
val_2 = str(2)    # val_2 will be '2'
z = str(3.0)  # z will be '3.0'

Module quiz

Test your knowledge on this module

5 questions

Python Numbers

Python Strings

Python Casting

AI Summary

Specify a Variable Type

Module quiz