Logical AND operation in python

Question

How does this expression work in Python?

x=1, y=2, z=3 
print(x and y and z)

Result is 3

If

x=3, y=2, z=1
print(x and y and z)

Result is 1

Anyone can explain this?

You can find the answer [here](https://stackoverflow.com/questions/49658308/how-does-the-logical-and-operator-work-with-integers-in-python). — time_is_a_drug, Jun 09 '19 at 17:56
The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned. — Rohit-Pandey, Jun 09 '19 at 18:03
`1 and 2 = 2 then 2 and 3 = 3, 3 and 2 = 2 then 2 and 1 = 1` — Rohit-Pandey, Jun 09 '19 at 18:03

Radosław Cybulski · Answer 1 · 2019-06-09T18:03:30.450

0

or operator in python returns first argument it is considered true, if not then it will return second. Neither value will be converted to boolean. and operator will return first argument if it is considered false, otherwise second. Once again no conversion.

so a or b is a if bool(a) == True otherwise it's b and a and b is a if bool(a) == False otherwise it's b

EDIT: edited my mistake - i switched and and or

edited Jun 09 '19 at 18:03

answered Jun 09 '19 at 17:54

Radosław Cybulski

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What you say seems opposite to what appears to be going on. The OPs terms all evaluate to True, and yet the final value is what is the result, not the first. – CryptoFool Jun 09 '19 at 17:58
Thank you, i forgot he asked about and, not or. – Radosław Cybulski Jun 09 '19 at 18:03

score 0 · Answer 2 · answered Jun 09 '19 at 17:56

In the logical test, the returned value is the one that has been evaluated last. so , in first test ==> print(1 and 2 and 3), the answer we get is 3 because it is last true value of the test. In the second test ==> print(3 and 2 and 1), similarly the answer is 1.

Logical AND operation in python

2 Answers2