Logical Operators

There are three logical operators that we can use and these logical operators are: and, or and not. The semantics of these operators is similar to their meaning in English language. For example:

>>>x=5
>>>x>0 and x < 10
True 

The previous expression is True because x is 5 and is greater than 0 and less than 10. So using logical operator and the result will be true only if two of the expressions are true otherwise will be false.

>>>n=6
>>>n % 2 == 0 or n%3 == 0 
True 

The expression is true if either of the conditions is true, that is, if the number is divisible by 2 or 3.

Finally, the not operator negates a boolean expression, so not (x > y) is true if x > y is false, that is, if x is less than or equal to y.

Strictly speaking, the operands of the logical operators should be boolean expressions, but Python is not very strict. Any nonzero number is interpreted as “true.”

>>> 17 and True
True

This flexibility can be useful, but there are some subtleties to it that might be confusing. You might want to avoid it (unless you know what you are doing).