Checking dependencies

run.py

@@ -54,6 +54,22 @@
 '''
 
 
+def check_pip_deps():
+    '''Check installed pip dependencies.
+
+    Make sure that the installed pip packages match what is in
+    requirements.txt, prompting the user to upgrade if not.
+    '''
+    req = subprocess.check_output(["cat", "requirements.txt"]).splitlines()
+    try:
+        pkg_resources.require(req)
+    except VersionConflict as e:
+        print(DEPS_VERSION_HELP % e)
+    except DistributionNotFound as e:
+        print(DEPS_NOTFOUND_HELP % e)
+    else:
+        return True
+
 
 def config_validator():
     '''Make sure the config file is ready.'''