Python: ‘a’ in arr in arr - Why False?

Question

arr = [1, True, 'a', 2]
print('a' in arr in arr)
# False

This was a SoloLearn match and I would like to understand how it is exactly interpreted by Python.

Certainly not this way:

print(('a' in arr) in arr)

because it would be equivalent to

1 in arr

which is clearly True. I can also not translate it to

print('a' in (arr in arr))

because I get a TypeError: argument of type 'bool' is not iterable.

Is the first code refer to an embedded list? If yes, where is the embedded list exactly?

Answer 1

It's because of operator chaining.
Similar to how you can write in python:
0 < x < 10
https://www.tutorialspoint.com/chaining-comparison-operators-in-python

Answer 2

Tibor Santa Thanks Tibor!
“if the expression is x < y < z, then it is similar to the x < y and y < z”

Answer 3

Mirielle👽 Seems to solve the problem. Could you formulate a general rule for that?

Answer 4

Jay Matthews See Mirielle’s answer

Answer 5

Suraj parida