Logical operators are used to combine conditional statements and perform logical operations. It plays a crucial role in decision-making and control flow in a program.
If in your program there is a nested if statement to execute a block of code, it works but it also makes the code lengthy.
For solving this you can use logical operators by using that combine more than one relational expression and according to the logical operator return true or false.
They are 3 logical operators in Python –
- Â And
- Or
- Â Not
Contents
1. AND
It needs more than one relational expression and it returns true if all expressions are true otherwise, it returns false.
and is used in those cases where need all expressions must be true.
Syntax –
expression1 and expression2
Example –
num = 10
if num > 5 and num < 20
print("Number is between 5 and 20")
print("num : ",num)
Output
Number is between 5 and 20 num : 10
2. OR
It also needs more than one relational expression and it returns true if one of the expressions or both of the expression is true and return false if all expression is false.
or is used in those cases where need one of the expression must be true.
Syntax –
expression1 or expression2
Example –
num = 10
if num > 5 or num < 20
print("In if statement")
print("num : ",num)
Output
In if statement num : 10
3. NOT
not operator is used to reverse the logical state of the expression. If a condition is returning false with not operator then code will be executed. Similarly, if it return true then the block of code will not execute.
Syntax –
not expression1
Example –
num = 10
if not num < 5
print("In if statement")
print("num : ",num)
Output
In if statement num : 10
4. Conclusion
Using these operators you can easily replace your multiple if statement code in your program. You can also use all 3 operators in a single condition.
Choose an operator for creating an expression according to the requirement.
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