Update app.py

app.py

@@ -3,8 +3,7 @@ Radar Data Downloader with Two-Step Workflow via Gradio Blocks
 ===============================================================
 
 Step 1: Click "Fetch Stations" to dynamically retrieve the full list of radar sites.
-Step 2: In the "Download Data" tab, select a radar type, choose a station (from the updated list),
-        enter a date (YYYY-MM-DD), and click "Download Data" to fetch the latest radar file.
+Step 2: In the "Download Data" tab, select a radar type, station, and date, then click "Download Data" to fetch the latest radar file.
 
 Required packages:
     pip install gradio boto3 requests
@@ -23,8 +22,9 @@ import requests
 def get_full_station_list():
     """
     Fetches a full list of radar stations from a public API endpoint.
-    For example, we use NOAA’s public radar station API endpoint as an example.
-    (If the API fails, falls back to fetching the static JSON file from GitHub.)
+    
+    Here we use NOAA’s public radar station endpoint.
+    If that fails, we fall back to a static JSON file from GitHub.
     Returns a sorted list of station identifiers.
     """
     api_url = "https://api.weather.gov/radar/stations"
@@ -44,7 +44,7 @@ def get_full_station_list():
             return stations
     except Exception as e:
         print(f"Error fetching station list from API: {e}")
-    # Fallback to static JSON from GitHub
+    # Fallback to static JSON from GitHub.
     return get_station_list_from_github()
 
 
@@ -53,7 +53,7 @@ def get_station_list_from_github():
     Fallback: Downloads and parses the radar_sites.json file from the Supercell Wx GitHub repository.
     Returns a sorted list of station identifiers.
     """
-    url = "https://raw.githubusercontent.com/dpaulat/supercell-wx/develop/data/radar_sites.json"
+    url = "https://raw.githubusercontent.com/dpaulat/supercell-wx/main/data/radar_sites.json"
     try:
         response = requests.get(url, timeout=10)
         response.raise_for_status()
@@ -74,14 +74,14 @@ def get_station_list_from_github():
 
 def update_station_list():
     """
-    Retrieves the full station list and returns an update for the dropdown component.
+    Retrieves the full station list and returns a dictionary to update the dropdown component.
+    (Note: Some Gradio versions do not support .update(), so we return a plain dict.)
     """
     stations = get_full_station_list()
     if stations:
-        # Update with the full list and set the default to the first station.
-        return gr.Dropdown.update(choices=stations, value=stations[0])
+        return {"choices": stations, "value": stations[0]}
     else:
-        return gr.Dropdown.update(choices=[], value=None)
+        return {"choices": [], "value": None}
 
 
 def fetch_latest_radar_data(radar_type, station, date_str):
@@ -89,12 +89,12 @@ def fetch_latest_radar_data(radar_type, station, date_str):
     Downloads the latest radar data file from the appropriate AWS S3 bucket.
     
     Parameters:
-        radar_type (str): Either "Level 2" or "Level 3".
-        station (str): Radar station identifier (e.g. "KTLX"). Must be non-empty.
-        date_str (str): Date string in "YYYY-MM-DD" format. If blank, uses current UTC date.
+        radar_type (str): "Level 2" or "Level 3".
+        station (str): Radar station identifier (e.g. "KTLX").
+        date_str (str): Date in "YYYY-MM-DD" format. If blank, uses current UTC date.
     
     Returns:
-        str: A summary of the downloaded file (S3 key, size, last modified, and hex preview).
+        str: A summary of the downloaded file (S3 key, file size, last modified, and hex preview).
     """
     if not station:
         return "Error: No station selected. Please fetch stations first."
@@ -167,26 +167,19 @@ with gr.Blocks() as demo:
     with gr.Tab("Fetch Stations"):
         with gr.Row():
             fetch_btn = gr.Button("Fetch Stations")
-            # This dropdown will show the fetched station list.
             station_dropdown_fetch = gr.Dropdown(choices=[], label="Available Radar Stations")
-        # Clicking fetch_btn will update the dropdown.
         fetch_btn.click(fn=update_station_list, inputs=[], outputs=station_dropdown_fetch)
     
     with gr.Tab("Download Data"):
         with gr.Row():
             radar_type = gr.Radio(choices=["Level 2", "Level 3"], label="Radar Data Type")
-            # The download dropdown; initially empty. It can be updated by a separate sync button.
             station_dropdown_download = gr.Dropdown(choices=[], label="Select Radar Station")
-        date_input = gr.Textbox(value=datetime.datetime.utcnow().strftime("%Y-%m-%d"),
-                                  label="Date (YYYY-MM-DD)")
+        date_input = gr.Textbox(value=datetime.datetime.utcnow().strftime("%Y-%m-%d"), label="Date (YYYY-MM-DD)")
         download_btn = gr.Button("Download Data")
         download_output = gr.Textbox(label="Download Output", interactive=False)
-        # When download_btn is clicked, call fetch_latest_radar_data.
         download_btn.click(fn=fetch_latest_radar_data,
                            inputs=[radar_type, station_dropdown_download, date_input],
                            outputs=download_output)
-        
-        # Optional: a button to sync the station list to the download dropdown.
         sync_btn = gr.Button("Sync Station List to Download Tab")
         sync_btn.click(fn=update_station_list, inputs=[], outputs=station_dropdown_download)
     
@@ -195,5 +188,4 @@ with gr.Blocks() as demo:
     )
 
 if __name__ == "__main__":
-    # For Spaces you might want to use share=True
     demo.launch()