api: Implement GET /messages/<message_id>.

zulip/zulip/__init__.py

@@ -697,6 +697,16 @@ class Client(object):
             request=message_filters
         )
 
+    def get_raw_message(self, message_id):
+        # type: (int) -> Dict[str, str]
+        '''
+            See examples/get-raw-message for example usage
+        '''
+        return self.call_endpoint(
+            url='messages/{}'.format(message_id),
+            method='GET'
+        )
+
     def send_message(self, message_data):
         # type: (Dict[str, Any]) -> Dict[str, Any]
         '''

zulip/zulip/examples/get-raw-message

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import argparse
+
+import zulip
+
+usage = """get-raw-message <message_id> [options]
+
+
+Example: get-raw-message 42
+"""
+
+
+parser = zulip.add_default_arguments(argparse.ArgumentParser(usage=usage))
+parser.add_argument('message_id', type=int)
+options = parser.parse_args()
+
+client = zulip.init_from_options(options)
+
+print(client.get_raw_message(options.message_id))