DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats

[robertoberto]

    import radix
    import socket
    rtree = radix.Radix()
    rnode = rtree.add("10.0.0.0/8")
    rnode.data["blah"] = "whatever you want"
    rnode = rtree.add("10.0.0.0/16")
    rnode = rtree.add("10.0.0.0", 16)
    rnode = rtree.add(network = "10.0.0.0", masklen = 16)
    #binary_addr = socket.inet_ntoa("172.18.22.0")
    binary_addr = socket.inet_aton("172.18.22.0") 
    rnode = rtree.add(packed = binary_addr, masklen = 23) #line 48   

classify.py:48: DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats rnode = rtree.add(packed = binary_addr, masklen = 23)

[hroncok]

On Python 3.10, this is an error:

The current failure is:

======================================================================
ERROR: test_14__packed_addresses4 (tests.test_regression.TestRadix)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/py-radix-0.9.3/tests/test_regression.py", line 201, in test_14__packed_addresses4
    node = tree.add(packed=p, masklen=26)
SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats
======================================================================
ERROR: test_15__packed_addresses6 (tests.test_regression.TestRadix)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/py-radix-0.9.3/tests/test_regression.py", line 212, in test_15__packed_addresses6
    node = tree.add(packed=p, masklen=108)
SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats
----------------------------------------------------------------------
Ran 39 tests in 0.292s
FAILED (errors=2)

See https://docs.python.org/3.10/whatsnew/3.10.html#id2 https://bugs.python.org/issue40943

The PY_SSIZE_T_CLEAN macro must now be defined to use PyArg_ParseTuple() and Py_BuildValue() formats which use #: es#, et#, s#, u#, y#, z#, U# and Z#. See Parsing arguments and building values and the PEP 353.