Postmodern Error Handling in Python 3.6(journalpanic.com)

    from typing import Callable, Iterable
    def filter(pred: Callable, xs: Iterable) -> Iterable:
        return [x for x in xs if pred(x)]

    filter(lambda x: x>1, [1,2,3])

    from typing import Callable, Iterable
    def filter(pred: Callable, xs: Iterable[int]) -> Iterable:
        return [x for x in xs if pred(x)]

    filter(lambda x: x>1, [1,2,3])
    filter(lambda x: x>1, [[1],[2],[3]]) # this is an error

    from typing import Callable, Iterable
    def filter(pred: Callable, xs: Iterable[float]) -> Iterable:
        return [x for x in xs if pred(x)]

    filter(lambda x: x>1, [1,2,3])
    filter(lambda x: x>1, [1.01, 2.09, 3.34])

  >>> import socket
  >>> issubclass(socket.error, Exception)
  True

  import urllib.request
  try:
      urllib.request.urlopen('https://wrong.host.badssl.com/')
  except (IOError, OSError):
      pass

  ssl.CertificateError: hostname 'wrong.host.badssl.com' doesn't match either of '*.badssl.com', 'badssl.com'

  try:
      do_something()
  except ExpectedException:
      handle_it()
  except OtherKnownException:
      handle_that_too()
  except Exception as exc:
      log.exception('New kind of error just happened')
      handle_fallback()