Better App Names (#91)

* Better terminal detection

* A better fallback option; remove service_name

Author: pglombardo

instana/meter.py

@@ -151,16 +151,17 @@ def process(self):
 
     def collect_snapshot(self):
         try:
-            if instana.service_name:
-                appname = instana.service_name
-            elif "FLASK_APP" in os.environ:
+            if "FLASK_APP" in os.environ:
                 appname = os.environ["FLASK_APP"]
             elif "DJANGO_SETTINGS_MODULE" in os.environ:
                 appname = os.environ["DJANGO_SETTINGS_MODULE"].split('.')[0]
-            elif hasattr(sys, '__interactivehook__') or (hasattr(sys, 'ps1') and hasattr(sys, 'ps2')):
+            elif os.path.basename(sys.argv[0]) == '' and sys.stdout.isatty():
                 appname = "Interactive Console"
             else:
-                appname = os.path.basename(sys.argv[0])
+                if os.path.basename(sys.argv[0]) == '':
+                    appname = os.path.basename(sys.executable)
+                else:
+                    appname = os.path.basename(sys.argv[0])
 
             s = Snapshot(name=appname, version=platform.version(),
                          f=platform.python_implementation(),