Use tslib._dateutil_gettz

Instead of calculating the platform dependend import each again we can use
the compatibility function already present.

Signed-off-by: Justin Lecher <[email protected]>

Author: jlec

pandas/compat/__init__.py

@@ -26,6 +26,7 @@
 
 Other items:
 * OrderedDefaultDict
+* platform checker
 """
 # pylint disable=W0611
 import functools
@@ -754,3 +755,19 @@ def __missing__(self, key):
     def __reduce__(self):  # optional, for pickle support
         args = self.default_factory if self.default_factory else tuple()
         return type(self), args, None, None, list(self.items())
+
+
+# https://github.com/pydata/pandas/pull/9123
+def is_platform_windows():
+    if sys.platform == 'win32' or sys.platform == 'cygwin':
+        return True
+
+
+def is_platform_linux():
+    if sys.platform == 'linux2':
+        return True
+
+
+def is_platform_mac():
+    if sys.platform == 'darwin':
+        return True

pandas/tests/test_series.py

@@ -5398,10 +5398,8 @@ def test_getitem_setitem_datetime_tz_pytz(self):
     def test_getitem_setitem_datetime_tz_dateutil(self):
         tm._skip_if_no_dateutil();
         from dateutil.tz import tzutc
-        if sys.platform != 'win32':
-            from dateutil.tz import gettz
-        else:
-            from dateutil.zoneinfo import gettz
+        from pandas.tslib import _dateutil_gettz as gettz
+
         tz = lambda x: tzutc() if x == 'UTC' else gettz(x)  # handle special case for utc in dateutil
 
         from pandas import date_range

pandas/tseries/tests/test_daterange.py

@@ -441,10 +441,7 @@ def test_month_range_union_tz_pytz(self):
     def test_month_range_union_tz_dateutil(self):
         _skip_if_windows_python_3()
         tm._skip_if_no_dateutil()
-        if sys.platform != 'win32':
-            from dateutil.tz import gettz as timezone
-        else:
-            from dateutil.zoneinfo import gettz as timezone
+        from pandas.tslib import _dateutil_gettz as timezone
         tz = timezone('US/Eastern')
 
         early_start = datetime(2011, 1, 1)

pandas/tseries/tests/test_period.py

@@ -101,19 +101,13 @@ def test_timestamp_tz_arg(self):
                          pytz.timezone('Europe/Brussels').normalize(p).tzinfo)
 
     def test_timestamp_tz_arg_dateutil(self):
-        if sys.platform != 'win32':
-            from dateutil.tz import gettz
-        else
-            from dateutil.zoneinfo import gettz
+        from pandas.tslib import _dateutil_gettz as gettz
         from pandas.tslib import maybe_get_tz
         p = Period('1/1/2005', freq='M').to_timestamp(tz=maybe_get_tz('dateutil/Europe/Brussels'))
         self.assertEqual(p.tz, gettz('Europe/Brussels'))
 
     def test_timestamp_tz_arg_dateutil_from_string(self):
-        if sys.platform != 'win32':
-            from dateutil.tz import gettz
-        else
-            from dateutil.zoneinfo import gettz
+        from pandas.tslib import _dateutil_gettz as gettz
         p = Period('1/1/2005', freq='M').to_timestamp(tz='dateutil/Europe/Brussels')
         self.assertEqual(p.tz, gettz('Europe/Brussels'))
 

pandas/tseries/tests/test_timeseries.py

@@ -417,10 +417,7 @@ def test_timestamp_to_datetime_explicit_pytz(self):
     def test_timestamp_to_datetime_explicit_dateutil(self):
         _skip_if_windows_python_3()
         tm._skip_if_no_dateutil()
-        if sys.platform != 'win32':
-            from dateutil.tz import gettz
-        else:
-            from dateutil.zoneinfo import gettz
+        from pandas.tslib import _dateutil_gettz as gettz
         rng = date_range('20090415', '20090519',
                          tz=gettz('US/Eastern'))
 
@@ -1810,10 +1807,7 @@ def test_append_concat_tz_explicit_pytz(self):
     def test_append_concat_tz_dateutil(self):
         # GH 2938
         tm._skip_if_no_dateutil()
-        if sys.platform != 'win32':
-            from dateutil.tz import gettz as timezone
-        else:
-            from dateutil.zoneinfo import gettz as timezone
+        from pandas.tslib import _dateutil_gettz as timezone
 
         rng = date_range('5/8/2012 1:45', periods=10, freq='5T',
                          tz='dateutil/US/Eastern')

pandas/tslib.pyx

@@ -41,6 +41,7 @@ from datetime import time as datetime_time
 # dateutil compat
 from dateutil.tz import (tzoffset, tzlocal as _dateutil_tzlocal, tzfile as _dateutil_tzfile,
                          tzutc as _dateutil_tzutc)
+import sys
 if sys.platform != 'win32':
     from dateutil.tz import gettz as _dateutil_gettz
 else: