I'm modifying some code that calls enumerate on a list declared via a list comprehension e.g.

self.groups = [Groups(self, idx) for idx in range(n_groups)]

then later:

for idx, group in enumerate(self.groups):
    # do some stuff

but when I change the enumerate call to start at the 2nd list element via the start parameter e.g.

for idx, group in enumerate(self.groups[1]):

I get an exception:

exceptions.TypeError: 'Group' object is not iterable

Could someone explain why this is?