zip stops at shorter sequence

Question

Accepted Answer

`zip` stops as soon as the shortest iterable is exhausted. Here `b` has only 2 elements, so the loop runs only twice, pairing (1, 'x') and (2, 'y'). The remaining elements of `a` - 3 and 4 - are silently ignored. Use `itertools.zip_longest` if you need to keep going and fill missing values with a default.