Python Expressions & Logical Operators Explained Clearly

本站添加: 2026-05-23

[00:00:00]Want to write real logic like a programmer? Let's master expressions and logical operators right now.

[00:00:05]An expression is a combination of values and operators that gives a result. For example, 5 + 3 is an expression and its result is 8. Python has three logical operators.

[00:00:17]The and operator means both conditions must be true.

[00:00:20]The or operator means at least one must be true. And not simply reverses the result.

[00:00:26]These are the foundation of decision-making in Python.

[00:00:29]When we write print true and true, the output is true.

[00:00:33]But print true and false gives false.

[00:00:36]Because and only returns true when both sides are true.

[00:00:39]When we write print true or false, the output is true.

[00:00:42]Because or needs just one side to be true.

[00:00:45]And when we write print not true, the output is false.

[00:00:49]Not simply flips the result.

[00:00:52]Now let's look at real practical examples. We have age equals 20.

[00:00:57]When we write print age greater than 18 and age less than 25, the output is true.

[00:01:02]This is range checking, checking if age falls between two values using and.

[00:01:08]Very common in placement rounds. When we write print 5 greater than 10 or 10 greater than 5, the output is true.

[00:01:15]Even though the first condition is false, the second is true and or only needs one.

[00:01:21]When we write print not a 5 greater than 3, the output is false.

[00:01:25]Because 5 greater than 3 is true and not flips it.

[00:01:29]Now here is a very common coding question.

[00:01:32]We have num equals 15.

[00:01:34]Print num modulo 3 equals 0 and num modulo 5 equals 0 gives true.

[00:01:42]This checks if the number is divisible by both 3 and 5. Since 15 divided by both gives remainder 0, both conditions are true.

[00:01:50]This exact logic appears in coding interviews all the time.

[00:01:54]Final insight. Python always calculates first, then compares.

[00:01:59]So, print 10 greater than 5 + 2 first calculates 7, then checks if 10 is greater than 7 and returns true.

[00:02:06]This is expression evaluation.

[00:02:09]Now you can build real logic like a programmer.

[00:02:13]Next, we will learn if else statements.

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