code: def ensure(cond, *args, **kwds):
      
      _CHK_UNEXP = 'check_condition() got an unexpected keyword argument {0}'
  
      raising = kwds.pop('raising', AssertionError)
      if kwds:
          raise TypeError(_CHK_UNEXP.format(repr(kwds.popitem()[0])))
  
      if cond is True:
          return
      raise raising(*args)
docs: Return if a condition is true, otherwise raise a caller-configurable
      :py:class:`Exception`
      :param bool cond: the condition to be checked
      :param sequence args: the arguments to be passed to the exception's
                            constructor
      The only accepted named parameter is `raising` used to configure the
      exception to be raised if `cond` is not `True`