why class creation throws error

Question

Just playin around class

def func(*args, **kwargs):
    print args, kwargs

class Klass(func): pass

it throws error

TypeError: Error when calling the metaclass bases function() argument 1 must be code, not str

What does it mean, i am passing no str nowhere? and yes I should be passing class in bases but why didn't error say that, instead of this cryptic error?

The title and most of the question suggests you don't understand why this is happening, but you're really asking why didn't the error message have different text. — Roger Pate
– Roger Pate, Commented Feb 22, 2010 at 5:35
yes I do not understand why it throws such cryptic error, instead of saying "functions can not be class base", i want to know why it is thorwing such cryptic error — user232137
– user232137, Commented Feb 22, 2010 at 5:40
Python3.1 has made the message even less helpful TypeError: function() argument 1 must be code, not str — John La Rooy
– John La Rooy, Commented Feb 22, 2010 at 6:18

Community · Accepted Answer · 2017-05-23 12:01:08Z

2

see here for the reason for the cryptic msg

http://bugs.python.org/issue6829

questions Error when calling the metaclass bases: function() argument 1 must be code, not str has same problem.

Edit: play-around

Though you can use metaclass to make it work in a twisted way ;)

def func(name, klassDict):
    return type(name, (), klassDict)

class MyMeta(type):
    def __new__(self, name, bases, klassDict):
        return bases[0](name, klassDict)

class Klass(func):
    __metaclass__ = MyMeta

print Klass

edited May 23, 2017 at 12:01

CommunityBot

11 silver badge

answered Feb 22, 2010 at 5:45

Anurag Uniyal

89.2k41 gold badges181 silver badges223 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

why class creation throws error

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related