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Boolean data type in Python
  • Last Updated : 23 Dec, 2020

Python boolean type is one of the built-in data types provided by Python, which are defined by the True or False keywords. Generally, it is used to represent the truth values of the expressions. The output <class ‘bool’> indicates the variable is a boolean data type.

Python3




a = True
type(a)
  
b = False
type(b)

Output:

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

Generally, booleans values are 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.

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 Operations

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)

Example:

Python3




A = True
B = False
  
print(A or B)
  
print(A and B)
  
print(not A)
  
print(not B)
  
print(A == B)
  
print(A != B)

Output:

True
False
False
True
False
True

Boolean Logic

Booleans are commonly used in the code to make it behave differently. Boolean can be used in conjunction with conditional statements to make it simpler. In many cases multiple conditions are needed to evaluate, for this purpose, AND and OR keywords are used. The AND returns True only if both the conditions are true, while OR returns true if any one of the conditions is true.

Python3




num = 10
  
if num > 1 and num < 10 :
    print("less then 10")
  
elif num >10 or num = 10 :
    print("geater or equal to 10")
  
else :
    print("not in range")

Output:

geater or equal to 10

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