Crimes with Python's pattern matching
  > But surely Python clamps down on this chicanery, right?
  > 
  > $ py10 abc.py
  > 10 is not iterable
  > string is iterable
  > [1, 2, 3] is iterable
  > 
  > Oh.
  > 
  > Oh my.

I'm sure I'm being dense and missing the obvious but ... what is the author responding to here? What's wrong or bad?