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Comment by gus_massa | Hacker News Reader

In the initial table, the numbers with 8 are misspelled "height", "heighteen" and "heighty", that have a unexpected "h".

Near line 42 you have to check if b is zero, otherwise it prints something like "twenty zero" instead of "twenty".

Fixed.

Thanks for the help.

Nitpicking:

      if op in "-/" and a < b:
          b, a = a, b

I think you have to swap only for "-", because / shows to the user the pair "a*b" and "a".