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A type checking and adapting library

Project description


Build Status

Expect the unexpected, but get what you want.

def get_int():
  return '1'

assert get_int() == 1

def get_str():
  return 22

assert get_str() == '22'

def get_strs(*args):
  return args

assert list(get_strs(1, 2, 3)) == ['1', '2', '3']

Works much better with your own objects or with SpringField



  • Dropped support for Python 2.6, added support for Python 3.7.

  • Cleaned up code formatting

Bug Fixes

  • Fixed issue that prevented use of an adaptable object (has an adapt method) as an anticipated list of type.


  • Change so that anticipating an iterable using [type] will always return a list instead of generator

  • Added anticipate_input_factory to make it easier to implement input handlers that need to inject values or handle input errors differently

  • Made it so you can use any object that implements adapt as an anticipate type so you can use SpringField fields as input types

  • Improved error messages

  • Split anticipate input and output handling into separate functions to make it easier to intercept input or output handling

  • Check that the params being anticipated exist in the function signature

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