py3: unblock C extensions on Python 3 Please make sure to build C extensions before running tests with -l: $ make local PYTHON=python3

py3: make test-ancestors.py pass on Python 3 with C extensions # skip-blame just some b prefixes

py3: do not pass a memoryview to bdiff.bdiff() This doesn't look nice, but I don't know how to make a zero-copy slice of bytes which is compatible with the buffer protocol.

py3: do not pass a list of iterators to computephasesmapsets()

cext: fix computephasesmapsets() not to return without setting an exception Spotted by map() of Python 3.

py3: do not pass a float to dict_new_presized() I really don't like the division operator of Python 3 since I'm not doing a math.

cext: mark tuple_format as a constant Just for clarity.

py3: bulk-replace 'const char*' format specifier passed to PyArg_ParseTuple*() Perhaps we need this because 's' accepts a unicode string. https://docs.python.org/3/c-api/arg.html#strings-and-buffers Substituted using the following pattern with some manual fixes: '\b(PyArg_ParseTuple)\((\s*\w+,\s*)"([^"]+)"' '\b(PyArg_ParseTupleAndKeywords)\((\s*\w+,\s*\w+,\s*)"([^"]+)"'

py3: bulk-replace bytes format specifier passed to Py_BuildValue() On Python 3, "s" means a utf-8 string. We have to use "y" for bytes, sigh. https://docs.python.org/3/c-api/arg.html#c.Py_BuildValue Substituted using the following pattern with some manual fixes: '\b(Py_BuildValue)\((\s*)"([^"]+)"'

py3: add PY23() macro to switch string literal depending on python version I have no better idea to work around the bytes-unicode divergence of Py_BuildValue(). Maybe we can write a code transformer for C extensions? :)