Strtol(), байты

print(id(n))

import ctypes
import struct
 
from collections import namedtuple
 
 
ReprInt = namedtuple('ReprInt', 'ob_refcnt ob_type ob_size ob_digit')
ReprFloat = namedtuple('ReprFloat', 'ob_refcnt ob_type ob_fval')
 
 
def repr_int(address):
    fmt = '3i'
    size = struct.calcsize(fmt)
    _, _, cnt = struct.unpack(fmt, ctypes.string_at(address, size))
    fmt = '3i{}'.format('H' * cnt)
    size = struct.calcsize(fmt)
    (ob_refcnt,
     ob_type,
     ob_size,
     *ob_digit) = struct.unpack(fmt, ctypes.string_at(address, size))
    return ReprInt(ob_refcnt, ob_type, ob_size, tuple(ob_digit))
 
 
def repr_float(address):
    fmt = '2id'
    size = struct.calcsize(fmt)
    return ReprFloat._make(struct.unpack(fmt, ctypes.string_at(address, size)))
 
 
def repr_number(x):
    address = id(x)
    if isinstance(x, float):
        _repr =  repr_float(address)
    elif isinstance(x, int):
        _repr = repr_int(address)
    else:
        raise TypeError
    return _repr
 
 
print(repr_number(123456789))
print(repr_number(12.34))