def _sympifyit(arg, retval=None):
 def deco(func):
  return __sympifyit(func, arg, retval)
 return deco

def _sympifyit ( arg , retval = None ) : def deco ( func ) : return __sympifyit ( func , arg , retval ) return deco
decorator to smartly _sympify function arguments @_sympifyit def add: in add .