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Boolean data type in Python

  • Last Updated : 02 Sep, 2021

Python boolean type is one of the built-in data types provided by Python, which represents one of the two values i.e. True or False. Generally, it is used to represent the truth values of the expressions. For example, 1== 0 is True whereas 2<1 is False. 

Python Boolean Type

The boolean value can be of two types only i.e. either True or False. The output <class ‘bool’> indicates the variable is a boolean data type.

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Example: Boolean type

Python3




a = True
type(a)
 
b = False
type(b)

Output:



<class 'bool'>
<class 'bool'>

Evaluate Variables and Expressions

We can evaluate values and variables using the Python bool() function. This method is used to return or convert a value to a Boolean value i.e., True or False, using the standard truth testing procedure. 

Syntax:

bool([x])

Example: Python bool() method

Python3




# Python program to illustrate
# built-in method bool()
 
# Returns False as x is not equal to y
x = 5
y = 10
print(bool(x==y))
 
# Returns False as x is None
x = None
print(bool(x))
 
# Returns False as x is an empty sequence
x = ()
print(bool(x))
 
# Returns False as x is an empty mapping
x = {}
print(bool(x))
 
# Returns False as x is 0
x = 0.0
print(bool(x))
 
# Returns True as x is a non empty string
x = 'GeeksforGeeks'
print(bool(x))
Output
False
False
False
False
False
True

We can also evaluate expression without using the bool() function also. The Booleans values will be returned as a result of some sort of comparison. In the example below the variable res will store the boolean value of False after the equality comparison takes place.

Example: Boolean value from the expression

Python3




# Declaring variables
a = 10
b = 20
 
# Comparing variables
print(a == b)

Output:

False

Integers and Floats as Booleans

Numbers can be used as bool values by using Python’s built-in bool() method. Any integer, floating-point number, or complex number having zero as a value is considered as False, while if they are having value as any positive or negative number then it is considered as True.

Python3




var1 = 0
print(bool(var1))
 
var2 = 1
print(bool(var2))
 
var3 = -9.7
print(bool(var3))

Output:

False
True
True

Boolean Operators

Boolean Operations are simple arithmetic of True and False values. These values can be manipulated by the use of boolean operators which include AND, Or, and NOT. Common boolean operations are –



  • or
  • and
  • not
  • == (equivalent)
  • != (not equivalent)

Boolean OR Operator

The Boolean or operator returns True if any one of the inputs is True else returns False.

ABA or B
TrueTrueTrue
TrueFalseTrue
FalseTrueTrue
FalseFalseFalse

Example: Python Boolean OR Operator

Python3




# Python program to demonstrate
# or operator
 
a = 1
b = 2
c = 4
 
if a > b or b < c:
    print(True)
else:
    print(False)
 
if a or b or c:
    print("Atleast one number has boolean value as True")
Output
True
Atleast one number has boolean value as True

In he above example, we have used Python boolean with if statement and OR operator that check if a is greater than b or b is smaller than c and it returns True if any of the condition is True (b<c in the above example).

Boolean And Operator

The Boolean and operator returns False if any one of the inputs is False else returns True.

ABA and B
TrueTrueTrue
TrueFalseFalse
FalseTrueFalse
FalseFalseFalse

Example: Python Boolean And Operator

Python3




# Python program to demonstrate
# and operator
 
a = 0
b = 2
c = 4
 
if a > b and b<c:
    print(True)
else:
    print(False)
     
if a and b and c:
    print("All the numbers has boolean value as True")
else:
    print("Atleast one number has boolean value as False")
Output
False
Atleast one number has boolean value as False

Boolean Not Operator

The Boolean Not operator only require one argument and returns the negatation of the argument i.e. returns the True for False and False for True.

ANot A
TrueFalse
FalseTrue

Example: Python Boolean Not Operator

Python3




# Python program to demonstrate
# not operator
 
a = 0
 
if not a:
    print("Boolean value of a is False")
Output
Boolean value of a is False

Boolean == (equivalent) and != (not equivalent) Operator

Both the operators are used to compred two results. == (equivalent operator returns True if two results are equal and != (not equivalent operator returns True if the two results are not same.

Example: Python Boolean == (equivalent) and != (not equivalent) Operator

Python3




# Python program to demonstrate
# equivalent an not equivalent
# operator
 
a = 0
b = 1
 
if a == 0:
    print(True)
     
if a == b:
    print(True)
     
if a != b:
    print(True)
Output
True
True

is Operator

The is keyword is used to test whether two variables belong to the same object. The test will return True if the two objects are the same else it will return False even if the two objects are 100% equal.

Example: Python is Operator

Python3




# Python program to demonstrate
# is keyword
 
 
x = 10
y = 10
 
if x is y:
    print(True)
else:
    print(False)
 
x = ["a", "b", "c", "d"]
y = ["a", "b", "c", "d"]
 
print(x is y)
Output
True
False

in Operator

in operator checks for the membership i.e. checks if the value is present in a list, tuple, range, string, etc.

Example: in Operator

Python3




# Python program to demonstrate
# in keyword
 
# Create a lits
animals = ["dog", "lion", "cat"]
 
# Check if lion in list or not
if "lion" in animals:
    print(True)
Output
True



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