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'RecursionError' in a for loop

I have tried to implement a flatten function to even flatten strings but got an error for Recursion. Could someone help resolve this puzzle?

def flatten(items):
  for x in items:
      if isinstance(x, Iterable):
         yield from flatten(x)
      else:
         yield x

items = [2, [3, 4, [5, 6], 7], 8, 'abc']

for x in flatten(items):
    print(x)

I was expecting to print '2, 3, 4, 5, 6, 7, 8, a, b, c'; but instead, I got '2, 3, 4, 5, 6, 7, 8 and a RecursionError. I think the 'abc' is also 'Iterable', so why the code doesn't work?

Thank you!



source https://stackoverflow.com/questions/74633320/recursionerror-in-a-for-loop
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