CLN: remove build warnings from tslib.pyx, saslib.pyx, some from lib.…

…pyx (pandas-dev#15264)

pandas/io/sas/saslib.pyx

@@ -311,7 +311,7 @@ cdef class Parser(object):
         self.current_page_subheaders_count =\
             self.parser._current_page_subheaders_count
 
-    cdef bint readline(self):
+    cdef readline(self):
 
         cdef:
             int offset, bit_offset, align_correction

pandas/lib.pyx

@@ -3,6 +3,7 @@ cimport numpy as np
 cimport cython
 import numpy as np
 import sys
+cdef bint PY3 = (sys.version_info[0] >= 3)
 
 from numpy cimport *
 
@@ -42,7 +43,6 @@ cdef extern from "Python.h":
         Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
         Py_ssize_t *slicelength) except -1
 
-
 cimport cpython
 
 isnan = np.isnan
@@ -1568,62 +1568,65 @@ def get_blkno_indexers(int64_t[:] blknos, bint group=True):
         int64_t cur_blkno
         Py_ssize_t i, start, stop, n, diff
 
+        object blkno
         list group_order
         dict group_slices
         int64_t[:] res_view
 
     n = blknos.shape[0]
 
-    if n > 0:
-        start = 0
-        cur_blkno = blknos[start]
+    if n == 0:
+        return
 
-        if group == False:
-            for i in range(1, n):
-                if blknos[i] != cur_blkno:
-                    yield cur_blkno, slice(start, i)
+    start = 0
+    cur_blkno = blknos[start]
 
-                    start = i
-                    cur_blkno = blknos[i]
+    if group == False:
+        for i in range(1, n):
+            if blknos[i] != cur_blkno:
+                yield cur_blkno, slice(start, i)
 
-            yield cur_blkno, slice(start, n)
-        else:
-            group_order = []
-            group_dict = {}
-
-            for i in range(1, n):
-                if blknos[i] != cur_blkno:
-                    if cur_blkno not in group_dict:
-                        group_order.append(cur_blkno)
-                        group_dict[cur_blkno] = [(start, i)]
-                    else:
-                        group_dict[cur_blkno].append((start, i))
-
-                    start = i
-                    cur_blkno = blknos[i]
-
-            if cur_blkno not in group_dict:
-                group_order.append(cur_blkno)
-                group_dict[cur_blkno] = [(start, n)]
-            else:
-                group_dict[cur_blkno].append((start, n))
+                start = i
+                cur_blkno = blknos[i]
 
-            for blkno in group_order:
-                slices = group_dict[blkno]
-                if len(slices) == 1:
-                    yield blkno, slice(slices[0][0], slices[0][1])
+        yield cur_blkno, slice(start, n)
+    else:
+        group_order = []
+        group_dict = {}
+
+        for i in range(1, n):
+            if blknos[i] != cur_blkno:
+                if cur_blkno not in group_dict:
+                    group_order.append(cur_blkno)
+                    group_dict[cur_blkno] = [(start, i)]
                 else:
-                    tot_len = sum(stop - start for start, stop in slices)
-                    result = np.empty(tot_len, dtype=np.int64)
-                    res_view = result
+                    group_dict[cur_blkno].append((start, i))
 
-                    i = 0
-                    for start, stop in slices:
-                        for diff in range(start, stop):
-                            res_view[i] = diff
-                            i += 1
+                start = i
+                cur_blkno = blknos[i]
 
-                    yield blkno, result
+        if cur_blkno not in group_dict:
+            group_order.append(cur_blkno)
+            group_dict[cur_blkno] = [(start, n)]
+        else:
+            group_dict[cur_blkno].append((start, n))
+
+        for blkno in group_order:
+            slices = group_dict[blkno]
+            if len(slices) == 1:
+                yield blkno, slice(slices[0][0], slices[0][1])
+            else:
+                tot_len = sum([stop - start for start, stop in slices])
+                result = np.empty(tot_len, dtype=np.int64)
+                res_view = result
+
+                i = 0
+                for start, stop in slices:
+                    for diff in range(start, stop):
+                        res_view[i] = diff
+                        i += 1
+
+                yield blkno, result
 
 
 @cython.boundscheck(False)
@@ -1670,7 +1673,7 @@ cpdef slice_canonize(slice s):
     Convert slice to canonical bounded form.
     """
     cdef:
-        Py_ssize_t start, stop, step, length
+        Py_ssize_t start = 0, stop = 0, step = 1, length
 
     if s.step is None:
         step = 1
@@ -1727,6 +1730,7 @@ cpdef slice_get_indices_ex(slice slc, Py_ssize_t objlen=PY_SSIZE_T_MAX):
 
     PySlice_GetIndicesEx(<PySliceObject *>slc, objlen,
                          &start, &stop, &step, &length)
+
     return start, stop, step, length
 
 

pandas/src/datetime_helper.h

@@ -15,10 +15,6 @@ The full license is in the LICENSE file, distributed with this software.
 #include "numpy/arrayobject.h"
 #include "numpy/arrayscalars.h"
 
-#if PY_MAJOR_VERSION >= 3
-#define PyInt_AS_LONG PyLong_AsLong
-#endif
-
 npy_int64 get_long_attr(PyObject *o, const char *attr) {
   npy_int64 long_val;
   PyObject *value = PyObject_GetAttrString(o, attr);

pandas/tslib.pyx

@@ -8,10 +8,8 @@ from numpy cimport (int8_t, int32_t, int64_t, import_array, ndarray,
 from datetime cimport get_datetime64_value, get_timedelta64_value
 import numpy as np
 
-# GH3363
-from sys import version_info
-cdef bint PY2 = version_info[0] == 2
-cdef bint PY3 = not PY2
+import sys
+cdef bint PY3 = (sys.version_info[0] >= 3)
 
 from cpython cimport (
     PyTypeObject,
@@ -24,11 +22,8 @@ from cpython cimport (
     PyUnicode_AsUTF8String,
 )
 
-
-# Cython < 0.17 doesn't have this in cpython
 cdef extern from "Python.h":
     cdef PyTypeObject *Py_TYPE(object)
-    int PySlice_Check(object)
 
 cdef extern from "datetime_helper.h":
     double total_seconds(object)
@@ -2121,8 +2116,8 @@ _DEFAULT_DATETIME = datetime(1, 1, 1).replace(
     hour=0, minute=0, second=0, microsecond=0)
 _MONTHS = ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL',
            'AUG', 'SEP', 'OCT', 'NOV', 'DEC']
-_MONTH_NUMBERS = dict((k, i) for i, k in enumerate(_MONTHS))
-_MONTH_ALIASES = dict((k + 1, v) for k, v in enumerate(_MONTHS))
+_MONTH_NUMBERS = {k: i for i, k in enumerate(_MONTHS)}
+_MONTH_ALIASES = {(k + 1): v for k, v in enumerate(_MONTHS)}
 
 
 cpdef object _get_rule_month(object source, object default='DEC'):
@@ -5529,8 +5524,8 @@ class TimeRE(dict):
             'B': self.__seqToRE(self.locale_time.f_month[1:], 'B'),
             'b': self.__seqToRE(self.locale_time.a_month[1:], 'b'),
             'p': self.__seqToRE(self.locale_time.am_pm, 'p'),
-            'Z': self.__seqToRE((tz for tz_names in self.locale_time.timezone
-                                        for tz in tz_names),
+            'Z': self.__seqToRE([tz for tz_names in self.locale_time.timezone
+                                 for tz in tz_names],
                                 'Z'),
             '%': '%'})
         base.__setitem__('W', base.__getitem__('U').replace('U', 'W'))
@@ -5553,7 +5548,7 @@ class TimeRE(dict):
                 break
         else:
             return ''
-        regex = '|'.join(re_escape(stuff) for stuff in to_convert)
+        regex = '|'.join([re_escape(stuff) for stuff in to_convert])
         regex = '(?P<%s>%s' % (directive, regex)
         return '%s)' % regex
 

setup.py

@@ -462,6 +462,7 @@ def pxd(name):
 
 tseries_depends = ['pandas/src/datetime/np_datetime.h',
                    'pandas/src/datetime/np_datetime_strings.h',
+                   'pandas/src/datetime_helper.h',
                    'pandas/src/period_helper.h',
                    'pandas/src/datetime.pxd']
 
@@ -584,6 +585,7 @@ def pxd(name):
 
 ujson_ext = Extension('pandas.json',
                       depends=['pandas/src/ujson/lib/ultrajson.h',
+                               'pandas/src/datetime_helper.h',
                                'pandas/src/numpy_helper.h'],
                       sources=['pandas/src/ujson/python/ujson.c',
                                'pandas/src/ujson/python/objToJSON.c',