Update app.py

app.py

@@ -10,8 +10,9 @@ def loadfile():
 def savefile(newuser):
     data = loadfile()
     data['users'].append(newuser)
+    json_object = json.dumps(data, indent=4)
     with open("data.json", "w") as f:
-        json.dump(data, f, indent=4)
+        f.write(json_object)
 
 def Signup():
     username = st.text_input("Username")