Use compat function for OS detection

and streamline OS detection functions return

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

Author: jlec

pandas/compat/__init__.py

@@ -759,15 +759,12 @@ def __reduce__(self):  # optional, for pickle support
 
 # https://github.com/pydata/pandas/pull/9123
 def is_platform_windows():
-    if sys.platform == 'win32' or sys.platform == 'cygwin':
-        return True
+    return sys.platform == 'win32' or sys.platform == 'cygwin'
 
 
 def is_platform_linux():
-    if sys.platform == 'linux2':
-        return True
+    return sys.platform == 'linux2'
 
 
 def is_platform_mac():
-    if sys.platform == 'darwin':
-        return True
+    return sys.platform == 'darwin'

pandas/tslib.pyx

@@ -41,8 +41,8 @@ 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 pandas.compat import is_platform_windows
+if is_platform_windows():
     from dateutil.tz import gettz as _dateutil_gettz
 else:
     from dateutil.zoneinfo import gettz as _dateutil_gettz