Question

I have only recently begun programming in Python (with previous Ruby experience). I am trying to set up an if condition with two conditions:

if not previous[1] and previous[0][0] == 5:
            print "hello world"

However, I keep getting this error:

<type 'exceptions.IndexError'>: tuple index out of range 

Print previous returns: ((5, 1, 9, 23),)

What am I doing wrong?

I am looking for something similar to they Ruby Syntax: unless previous[1]

Answer 1

((5, 1, 9, 23),), then this is a length-1 tuple. It’s only element–with index 0–is the tuple (5, 1, 9, 23). It doesn’t have a second element to have the index 1, so that_tuple[1] raises IndexError.

What did you hope previous[1] would give you?