some code...

lib/core/command.py

@@ -0,0 +1,28 @@
+import subprocess
+
+
+class Command:
+    def __init__(self, command):
+        self.command = command
+        self.output = ""
+        self.error = ""
+
+    def __str__(self):
+        return command
+
+    def hasProcessed(self):
+        return self.output != "" and self.error != ""
+
+    def doProcess(self):
+        process = subprocess.Popen([self.command], stdout=subprocess.PIPE)
+        self.output, self.error = process.communicate()
+
+    def getOutput(self):
+        if not self.hasProcessed():
+            self.doProcess()
+        return self.output
+
+    def getError(self):
+        if not self.hasProcessed():
+            self.doProcess()
+        return self.error