python boolean data type

How to use Python boolean data type?


A data type specifies the values a variable can hold and what operations can be performed on it.  In Python every type is a class, so we can say an object rather than a variable.

Boolean is one of the data types, that can have only two values either True or False. Following example shows a basic example for boolean variables.

 x = True;
 y = False;
 #Check the type of x and y.
 print(type(x));
 print(type(y));

Output->

Type of x  <class 'bool'>
 Type of y <class 'bool'>

NOTE: The True and False keywords are case sensitive, it must start with a capital letter. Ignoring the case (e.g true or false) will give an error.

Integers/Floats values as Boolean-

The Integer and floating-point numbers having values of either zero or non zero. If we convert an integer or floating-point value into a boolean type, a value zero converts into False and all nonzero into True.

For conversion, we can use the bool() function, which takes an integer value as an argument and returns a boolean.

The following example shows how we can convert integers and floating-point values into Boolean types.

 A = 100;
 B = -20;
 C = 3.6;
 D = -4.3;
 E = 0;
 F = 0.0;
 Conversion into boolean
 print("Boolean value of", A, " after conversion = ", bool(A));
 print("Boolean value of", B, " after conversion = ", bool(A));
 print("Boolean value of", C, " after conversion = ", bool(C));
 print("Boolean value of", D, " after conversion = ", bool(D));
 print("Boolean value of", E, " after conversion = ", bool(E));
 print("Boolean value of", F, " after conversion = ", bool(F));

Output->

 Boolean value of 100  after conversion =  True
 Boolean value of -20  after conversion =  True
 Boolean value of 3.6  after conversion =  True
 Boolean value of -4.3  after conversion =  True
 Boolean value of 0  after conversion =  False
 Boolean value of 0.0  after conversion =  False

Convert Boolean into Integer-

The Boolean constants True and False represent One and Zero if converted into integers. The following example shows the conversion of Boolean values into integers.

 A = True;
 B = False;
 print("Conversion of", A, " into an integer = ", int(A));
 print("Conversion of", B, " into an integer = ", int(B));

Output->

 Conversion of True  into an integer =  1
 Conversion of False  into an integer =  0

Why there is a boolean type if the value 0/1 can do the job?

The keyword True and False, looks that it’s two integer values. So why there is a separate type itself?

The reason is optimization, we know for Boolean value one a bit is sufficient to store in the memory.

What are the Boolean Arithmetic operations?

All bit-level operations are applicable to the Boolean types. Arithmetic involves logical operations for single bit fields with operators. The operators know boolean operators.

Boolean OperatorMeaning and Use
== Meaning: Check Equality
Usage: x = y, returns true if both x and y are the same
!= Meaning: Check not equal
Usage: x != y, returns true if both x and y are not the same
or Meaning: Either
Usage: x or y, returns true if any of x or y is True.
and Meaning: Both
Usage: x and y, returns true if both x and y are True.
not Meaning: Flip the value
Usage: not x, returns true if x is false or returns false if x is true.
List of Boolean Operators in Python

Following is an example in Python for all Boolean operators.

 A = True;
 B = False;
 print(" Operator == , applies on A and B result = ", A == B);
 print(" Operator != applies on A and B result = ", A !=  B);
 print(" Operator and , applies on A and B result = ", A and B);
 print(" Operator or , applies on A and B result = ",  A or B);
 print(" Operator not , applies on A result = ", not A);
 print(" Operator or , applies on B result = ", not B);

Output->

 Operator == , applies on A and B result =  False
  Operator != applies on A and B result =  True
  Operator and , applies on A and B result =  False
  Operator or , applies on A and B result =  True
  Operator not , applies on A result =  False
  Operator or , applies on B result =  Truee