What does "lambda x: x-0 and x-1" mean? [duplicate]

Question

What does the expression do?

my_tuple = (0, 1, 2, 3, 4, 5)
foo = list(filter(lambda x: x-0 and x-1, my_tuple))
print(foo)

What output is to be expected from above equation?

Answer 1

1. x-0 and x-1 → can be change x and x-1, it will check if x is not 0 or x-1 is not 0, (0 stands for False and any other number is stand for True in Python).
2. In simple word this will filter the list where ever x is either 0 or 1

So output will be [2, 3, 4, 5]

Answer 2

lambda is a quick way to create a one liner function, where the left side of the : is the function's argument and the right side is the returned value.

Let's break this expression down, working from the inside out:

• lambda x:x-0 and x-1 is a function that takes x, calculates x-0 (which is just x), x-1 and performs a logical "and" operation between them. This function will return True if both sides of the and are not zero. In other words, it will return True if x is neither 0 nor 1.
• filter(lambda x:x-0 and x-1, my_tuple) takes my_tuple, and evaluates every element with the function defined above, keeping only those that return True
• Applying list to the result of the filter call converts the resulting filter object to a list.

So, to summarize - this call retuns a list containing all the elements in my_tuple that aren't 0 or 1.