Search code examples
pythonlistpython-3.7comparison-operators

Python TypeError: '<' not supported between instances of 'int' and 'list'

I want to compare a value to a list and if all of the values are True, return True. If any values are False, return False. For example:

all(3 < [3,4,5])

Should return False. 

all(3 < [4,5])

Should return True. However, I get this error:

TypeError: '<' not supported between instances of 'int' and 'list'

This runs:

3 < all([4,5])

but doesn't produce the right answer because 3 is greater than [True, True]. I apologize if this is a duplicate, but of the 6 examples I found of this error on SO, none of them answer my question. The weird thing is I feel like I have successfully used this in the past without issues. I am running Python 3.7.3 on a Macbook.

Solution 
  • all(3 < i for i in [4, 5])

    all acts on a sequence of Booleans; it does not distribute over arbitrary arguments. A search for a tutorial is usually a good idea before posting.