Add defaults for get_label

Author: h-vetinari

pandas/_libs/hashtable_class_helper.pxi.in

@@ -362,7 +362,7 @@ cdef class {{name}}HashTable(HashTable):
 
     @cython.boundscheck(False)
     def get_labels(self, const {{dtype}}_t[:] values, {{name}}Vector uniques,
-                   Py_ssize_t count_prior, Py_ssize_t na_sentinel,
+                   Py_ssize_t count_prior=0, Py_ssize_t na_sentinel=-1,
                    object na_value=None):
         cdef:
             Py_ssize_t i, n = len(values)
@@ -699,7 +699,7 @@ cdef class StringHashTable(HashTable):
 
     @cython.boundscheck(False)
     def get_labels(self, ndarray[object] values, ObjectVector uniques,
-                   Py_ssize_t count_prior, int64_t na_sentinel,
+                   Py_ssize_t count_prior=0, int64_t na_sentinel=-1,
                    object na_value=None):
         cdef:
             Py_ssize_t i, n = len(values)
@@ -879,7 +879,7 @@ cdef class PyObjectHashTable(HashTable):
 
     @cython.boundscheck(False)
     def get_labels(self, ndarray[object] values, ObjectVector uniques,
-                   Py_ssize_t count_prior, int64_t na_sentinel,
+                   Py_ssize_t count_prior=0, int64_t na_sentinel=-1,
                    object na_value=None):
         cdef:
             Py_ssize_t i, n = len(values)