more memoryview syntax in groupby

Author: mroeschke

pandas/_libs/groupby.pyx

@@ -511,9 +511,9 @@ def group_shift_indexer(
 @cython.wraparound(False)
 @cython.boundscheck(False)
 def group_fillna_indexer(
-    ndarray[intp_t] out,
-    ndarray[intp_t] labels,
-    ndarray[uint8_t] mask,
+    intp_t[::1] out,
+    const intp_t[::1] labels,
+    const uint8_t[:] mask,
     int64_t limit,
     bint compute_ffill,
     int ngroups,
@@ -1179,13 +1179,13 @@ def group_ohlc(
 @cython.boundscheck(False)
 @cython.wraparound(False)
 def group_quantile(
-    ndarray[float64_t, ndim=2] out,
+    float64_t[:, ::1] out,
     ndarray[numeric_t, ndim=1] values,
-    ndarray[intp_t] labels,
+    const intp_t[::1] labels,
     const uint8_t[:] mask,
     const float64_t[:] qs,
-    ndarray[int64_t] starts,
-    ndarray[int64_t] ends,
+    const int64_t[::1] starts,
+    const int64_t[::1] ends,
     str interpolation,
     uint8_t[:, ::1] result_mask,
     bint is_datetimelike,