def _coerce(T, S):
 assert (T is not bool), 'initial type T is bool'
 if (T is S):
  return T
 if ((S is int) or (S is bool)):
  return T
 if (T is int):
  return S
 if issubclass(S, T):
  return S
 if issubclass(T, S):
  return T
 if issubclass(T, int):
  return S
 if issubclass(S, int):
  return T
 if (issubclass(T, Fraction) and issubclass(S, float)):
  return S
 if (issubclass(T, float) and issubclass(S, Fraction)):
  return T
 msg = "don't know how to coerce %s and %s"
 raise TypeError((msg % (T.__name__, S.__name__)))

def _coerce ( T , S ) : assert ( T is not bool ) , 'initial type T is bool' if ( T is S ) : return T if ( ( S is int ) or ( S is bool ) ) : return T if ( T is int ) : return S if issubclass ( S , T ) : return S if issubclass ( T , S ) : return T if issubclass ( T , int ) : return S if issubclass ( S , int ) : return T if ( issubclass ( T , Fraction ) and issubclass ( S , float ) ) : return S if ( issubclass ( T , float ) and issubclass ( S , Fraction ) ) : return T msg = "don't know how to coerce %s and %s" raise TypeError ( ( msg % ( T . __name__ , S . __name__ ) ) )
coerce types t and s to a common type .