CODEWITHSUNDEEP
pythoncommand-linedata-sciencepython-3.7
Tanay Kulkarni
Tanay Kulkarni

Reputation: 17

Trying to bitwise and two lists in python

I did the following in the python shell. The first and third output is correct but the second and is just wrong. I know i can use the zip function to do this but i want to know why python does this.

>>> [1,1,1,1] and [1,0,0,0]
[1, 0, 0, 0]
>>> [1,0,0,0] and [1,1,0,0]
[1, 1, 0, 0]
>>> [1,1,1,1] and [0,0,0,0]
[0, 0, 0, 0]

Upvotes: 0

Views: 2516

Answers (1)

SSharma
SSharma

Reputation: 953

As mentioned at : Python AND operator on two boolean lists - how?
"and simply returns either the first or the second operand, based on their truth value. If the first operand is considered false, it is returned, otherwise the other operand is returned." by Martijn Pieters

[1,1,1,1] and [1,0,0,0]
=> [1, 0, 0, 0] which is second operand while first is true.

Another example:

a=2
print(a==3 and [1,1,0,0])

return False while a==3 is false
And 

a=2
print(a==2 and [1,1,0,0])

return [1,1,0,0] while a==2 is true

Upvotes: 1

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