Use named tuple for return value

i3pystatus/core/command.py

@@ -1,6 +1,9 @@
 # from subprocess import CalledProcessError
+from collections import namedtuple
 import subprocess
 
+CommandResult = namedtuple("Result", ['rc', 'out', 'err'])
+
 
 def run_through_shell(command, enable_shell=False):
     """
@@ -10,10 +13,11 @@ def run_through_shell(command, enable_shell=False):
     Don't use this function with programs that outputs lots of data since the output is saved
     in one variable
     """
+
     returncode = None
+    stderr = None
     try:
         proc = subprocess.Popen(command, stderr=subprocess.PIPE, stdout=subprocess.PIPE, shell=enable_shell)
-
         out, stderr = proc.communicate()
         out = out.decode("UTF-8")
         stderr = stderr.decode("UTF-8")
@@ -26,4 +30,4 @@ def run_through_shell(command, enable_shell=False):
     except subprocess.CalledProcessError as e:
         out = e.output
 
-    return returncode, out, stderr
+    return CommandResult(returncode, out, stderr)