Method datetime.time.strftime in Python and C implementation has different signature. Python implementation use `fmt` as argument and C implementation use `format` as argument. 

Python implementation:
```python
def strftime(self, fmt):
  ...
```

C implementation
```C
static PyObject *
time_strftime(PyDateTime_Time *self, PyObject *args, PyObject *kw)
{
    PyObject *result;
    PyObject *tuple;
    PyObject *format;
    static char *keywords[] = {"format", NULL};

    if (! PyArg_ParseTupleAndKeywords(args, kw, "U:strftime", keywords,
                                      &format))
        return NULL;
```

My suggestion to use the same argument name for both implementations, for example to use `format` as in C implementation.