Python OR is a logical operator keyword. The OR operator returns True if at least one of the operands becomes to be True.
Note:
- In Python or operator does not return True or False.
- The or operator in Python returns the first operand if it is True else the second operand.
Python OR Keyword Truth Table
| Input 1 | Input2 | Output |
|---|---|---|
| True | True | True |
| True | False | True |
| False | True | True |
| False | False | False |
In python or keyword works in two main situations of Boolean context :
If Statements
In the if statement python uses the or operator to connect the conditions in one expression.
Example :
Python3
# initializing variable a = 55b = 33 # defining the condition if b > a: print("b is greater than a") elif a == b: print("a and b are equal") else: print("a is greater than b") |
Output:
a is greater than b
While Loops
Another Statement of the Boolean context where you use the python or operator is while loop. By using or in the loop’s header, you can test several conditions and run the body until all the conditions evaluate to false.
Example :
Python3
# break the loop as soon it sees 'e' # or 's' i = 0a = 'neveropen' while i < len(a): if a[i] == 'e' or a[i] == 's': i += 1 break print('Current Letter :', a[i]) i += 1 |
Output:
Current Letter : g
Practical Applications
Short-circuit evaluation is the semantics of some Boolean operators in programming in which the second argument is evaluated only if the first argument does not suffice to determine the output. When the first argument is true, the overall output becomes true.
