execute r.json() only when needed

protocol_translation_live/pad.py

@@ -37,10 +37,11 @@ class Etherpad(Pad):
         r = requests.get(self.main_url + "/api/1/getText?apikey=" + self.api_key +
                          "&padID=" + self.pad_id)
 
-        if not r.json()["code"] == 0:
-            raise Exception(r.json()["message"])
+        r_json = r.json()
+        if not r_json["code"] == 0:
+            raise Exception(r_json["message"])
 
-        return r.json()["data"]["text"]
+        return r_json["data"]["text"]
 
     def write(self, string: str) -> None:
         r = requests.post(
@@ -48,16 +49,18 @@ class Etherpad(Pad):
             "&padID=" + self.pad_id,
             data={"text": string})
 
-        if not r.json()["code"] == 0:
-            raise Exception(r.json()["message"])
+        r_json = r.json()
+        if not r_json["code"] == 0:
+            raise Exception(r_json["message"])
 
     def append(self, string: str) -> None:
         string = quote(string)
         r = requests.get(self.main_url + "/api/1.2.13/appendText?apikey=" + self.api_key +
                          "&padID=" + self.pad_id + "&text=" + string)
 
-        if not r.json()["code"] == 0:
-            raise Exception(r.json()["message"])
+        r_json = r.json()
+        if not r_json["code"] == 0:
+            raise Exception(r_json["message"])
 
 
 class HedgedocNote(Pad):