Move some imports to top of file, remove dup implimention of day_name…

… in fields

pandas/_libs/tslibs/ccalendar.pyx

@@ -12,6 +12,8 @@ cimport numpy as cnp
 from numpy cimport int64_t, int32_t
 cnp.import_array()
 
+import locale
+from strptime import LocaleTime
 
 # ----------------------------------------------------------------------
 # Constants
@@ -225,9 +227,8 @@ cpdef get_locale_names(object name_type, object time_locale=None):
     cdef:
         list locale_names
 
-    import locale
     from pandas.util.testing import set_locale
-    from strptime import LocaleTime
+
     with set_locale(time_locale, locale.LC_TIME):
         locale_names = getattr(LocaleTime(), name_type)
     return locale_names

pandas/_libs/tslibs/fields.pyx

@@ -100,18 +100,7 @@ def get_date_name_field(ndarray[int64_t] dtindex, object field,
     count = len(dtindex)
     out = np.empty(count, dtype=object)
 
-    if field == 'weekday_name':
-        _dayname = np.array(DAYS_FULL, dtype=np.object_)
-        for i in range(count):
-            if dtindex[i] == NPY_NAT:
-                out[i] = np.nan
-                continue
-
-            dt64_to_dtstruct(dtindex[i], &dts)
-            dow = dayofweek(dts.year, dts.month, dts.day)
-            out[i] = _dayname[dow]
-        return out
-    elif field == 'day_name':
+    if field == 'day_name':
         if time_locale is None:
             _dayname = np.array(DAYS_FULL, dtype=np.object_)
         else:

pandas/core/indexes/datetimes.py

@@ -311,7 +311,7 @@ def _add_comparison_methods(cls):
     _bool_ops = ['is_month_start', 'is_month_end',
                  'is_quarter_start', 'is_quarter_end', 'is_year_start',
                  'is_year_end', 'is_leap_year']
-    _object_ops = ['weekday_name', 'freq', 'tz']
+    _object_ops = ['weekday_name', 'day_name', 'freq', 'tz']
     _field_ops = ['year', 'month', 'day', 'hour', 'minute', 'second',
                   'weekofyear', 'week', 'weekday', 'dayofweek',
                   'dayofyear', 'quarter', 'days_in_month',
@@ -1720,7 +1720,7 @@ def freq(self, value):
 
     weekday_name = _field_accessor(
         'weekday_name',
-        'weekday_name',
+        'day_name',
         "The name of day in a week (ex: Friday)\n\n.. deprecated:: 0.23.0")
 
     dayofyear = _field_accessor('dayofyear', 'doy',