small fixes

static/js/generator.js

@@ -107,6 +107,8 @@ function buildPythonScript() {
     payload.app_variant = $("pyAppVariant").value;
   }
 
+  const payloadJson = JSON.stringify(payload, null, 4);
+
   const script = `#!/usr/bin/env python3
 import json
 import re
@@ -115,7 +117,8 @@ import requests
 BASE_URL = ${JSON.stringify(baseUrl)}
 ENDPOINT = ${JSON.stringify(endpoint)}
 
-payload = ${JSON.stringify(payload, null, 4)}
+payload_json = """${payloadJson}"""
+payload = json.loads(payload_json)
 
 resp = requests.post(BASE_URL + ENDPOINT, json=payload, timeout=120)
 
@@ -127,7 +130,6 @@ print("X-Generated-At:", resp.headers.get("X-Generated-At"))
 ct = (resp.headers.get("Content-Type") or "").lower()
 
 if resp.status_code >= 400:
-    # try show JSON error, else text
     try:
         print(json.dumps(resp.json(), indent=2))
     except Exception:
@@ -143,7 +145,6 @@ else:
     if m:
         filename = m.group(1)
     else:
-        # fallback extension
         if "text/csv" in ct:
             filename += ".csv"
         elif "javascript" in ct: