change_builtin_module.py

# Change set.__module__ to 'builtins'
# so that it will pickle with the right module for Python 3
from ctypes import Structure, c_ssize_t, c_void_p, c_char_p
class PyTypeObject(Structure):
    _fields_ = [
        ('ob_refcnt', c_ssize_t),
        ('ob_type', c_void_p),
        ('ob_size', c_ssize_t),
        ('tp_name', c_char_p),
    ]
set_type = PyTypeObject.from_address(id(set))
set_type.tp_name = 'builtins.set'