Ctypes Python. How do you use arithmetic surgery?

[Nykeriab]

For example, the code is:

from ctypes import c_longlong as ll
k = ll(10**17-1)
k-=1

This code doesn't work.

from ctypes import c_longlong as ll
k = ll(10**17-1)
k-=ll(1)

So is it. How do you put the arithmetic in the "shit" type? How to give class a method add Or are there other ways?

[Cleofas]

In such situations, the operation should be used dir:

>>> dir(k)
['__bool__', '__class__', '__ctype_be__', '__ctype_le__', '__ctypes_from_outparam__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_b_base_', '_b_needsfree_', '_objects', '_type_',
'value']

And obviously value is the field that needs to be

>>> k.value
99999999999999999
>>> k.value -= 1
>>> k
c_longlong(99999999999999998)

The other way is... help(k)♪ Well, of course, you can just read the documentation totypes.