> With the release of Python 3.6, it became clear that Pylama was in need of maintenance updates. Python 3.6 warned that async was about to become a reserved keyword in Python 3.7.

I can imagine there must be lot of code bases with async as variable name. For example:

  async = True

This is an error in Python 3.7.

  >>> async = 1
    File "<stdin>", line 1
      async = 1
            ^
  SyntaxError: invalid syntax

But this used to run just fine without any warning or issues until Python 3.5.

So now any code that uses async as a variable name would break. So is Python 3.7 considered a breaking change that is not backward compatible?