<s>[INST] This program will convert the following code from Python 3 to Python 2:
```
from dataclasses import dataclass
from enum import Enum
from functools import wraps, singledispatch
from inspect import getmembers, isclass
from typing import TYPE_CHECKING

def decorator(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        return func(*args, **kwargs)
    return wrapper

def checker(cls):
    return cls() is not None

@dataclass
class TestType:
    name: str
    type: Type
    required: bool = True

@decorator
@checker
@dataclass
class TestClass:
    test_type: TestType
    test_str: str

def exception_handler(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        try:
            return func(*args, **kwargs)
        except:
            raise
    return wrapper

def check_type(md, expected_type):
    if TYPE_CHECKING:
        return True
    if not isinstance(md, expected_type):
        raise TypeError(f"Expected type {expected_type}, received type {type(md)}")
    return True

def check_type_mult(md, *types):
    for type in types:
        if not check_type(md, type):
            return False
    return True

def check_type_singledispatch(dispatch_func):
    return singledispatch(dispatch_func)
```
I'll provide you the code with problems I found so we can discuss them.

Here is the code with the issues:
```
from dataclasses import dataclass
from enum import Enum
from functools import wraps, singledispatch
from inspect import getmembers, isclass
import types

def decorator(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        return func(*args, **kwargs)
    return wrapper

def checker(cls):
    return cls() is not None[/INST]