Likewise I was trying to figure out how to do this in a OO way, I could tell my solution was very messy.
This shows it nice and clearly. Also didn't know about every and bind. Thanks

Thanks Andrew, nick Kata.
No negative comments, like your length test as I was failing that due to a bug in my loop counter and it pointed me in the right direction for a fix.

Pretty hard for the level it's at - enjoyed it though. Haven't quite figured out how I'm going to deal with all the leading zeros and conver the type to integer to do a valid addition on it.

Really like this, made me go and study MDN and figure out how the reduce function works. Nice one.

Same solution, all return cases are blank.
Not sure why :-(

Also failing this test - not sure why

Really didn't understand what I was supposed to be doing.

Liked that it made me think about manipulating different types like strings lists and sets. Didn't understand while my solution was failing with a ValueError - and still don't. Assume it was due to trying to cast a string as an Int but couldn't see that in the displayed test cases - maybe I missed it. If that is the case definitely add a test case in the bottom right to account for this.
Overall could do with a bit of improvement but nice challenge.

Semi colon missing for first def statement. Couldn't understand why tests were failing until I looked into the test module code. Maybe that's the point - if not have a hint during description that you may have to deal with negatives.

I was totally unaware you could do this line in Python (x1,y1),(x2,y2) = vector
Would you be able to explain how this is possible, for example what data type it may be using or what I can go away and lookup to understand.
Or is it simply that Python is smart enough to 'understand' co-ordinates.