Create app.py

app.py

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+import os
+os.environ["XDG_CONFIG_HOME"] = os.path.join(os.getcwd(), ".config")
+
+import streamlit as st
+import pandas as pd
+import openai
+import time
+from io import StringIO
+
+# --- CONFIG ---
+st.set_page_config(page_title="🖼️ Alt Text Generator", layout="wide")
+VALID_IMAGE_EXTENSIONS = [".jpg", ".jpeg", ".png", ".webp", ".gif", ".bmp"]
+
+st.title("🖼️ AI Alt Text Generator")
+st.markdown("Generate SEO-friendly alt text for image URLs using GPT-4o Vision.\nMade by [Florian Potier](https://twitter.com/FloPots)")
+
+# --- INPUT API KEY ---
+api_key = st.text_input("🔑 Enter your OpenAI API key", type="password")
+if not api_key:
+    st.stop()
+client = openai.OpenAI(api_key=api_key)
+
+# --- INPUT FILE ---
+uploaded_file = st.file_uploader("📁 Upload a CSV with image URLs", type=["csv"])
+if uploaded_file:
+    df = pd.read_csv(uploaded_file)
+    st.success("✅ File uploaded successfully")
+    st.dataframe(df.head())
+
+    # --- COLUMN SELECT ---
+    image_col = st.selectbox("🧭 Select the column with image URLs", df.columns)
+
+    # --- PROMPT INPUT ---
+    prompt_instruction = st.text_area("📝 Enter the prompt to generate alt text",
+        value="Write a concise, SEO-friendly alt text for the image below. Do not use brand names unless visible.")
+
+    def is_valid_image_url(url: str):
+        return any(url.lower().endswith(ext) for ext in VALID_IMAGE_EXTENSIONS)
+
+    df["Valid Image"] = df[image_col].astype(str).apply(is_valid_image_url)
+    valid_df = df[df["Valid Image"] == True]
+
+    if valid_df.empty:
+        st.error("❌ No valid image URLs found. Make sure URLs end with .jpg, .png, .webp, etc.")
+        st.stop()
+
+    st.info(f"🔍 {len(valid_df)} valid image URLs found. Invalid ones will be skipped.")
+
+    # --- PROCESS ---
+    if st.button("🚀 Start Processing"):
+        progress = st.progress(0)
+        results = []
+        urls = valid_df[image_col].tolist()
+
+        for idx, url in enumerate(urls):
+            try:
+                response = client.chat.completions.create(
+                    model="gpt-4o",
+                    messages=[
+                        {
+                            "role": "user",
+                            "content": [
+                                {"type": "text", "text": prompt_instruction},
+                                {"type": "image_url", "image_url": {"url": url}}
+                            ]
+                        }
+                    ]
+                )
+                alt_text = response.choices[0].message.content.strip()
+            except Exception as e:
+                alt_text = f"ERROR: {e}"
+
+            results.append(alt_text)
+            progress.progress((idx + 1) / len(urls))
+            time.sleep(1)
+
+        valid_df["Generated Alt Text"] = results
+        output_df = df.copy()
+        output_df.loc[valid_df.index, "Generated Alt Text"] = valid_df["Generated Alt Text"]
+
+        st.success("✅ Done! Preview of the results:")
+        st.dataframe(output_df[[image_col, "Generated Alt Text"]].head())
+
+        csv = output_df.to_csv(index=False).encode("utf-8")
+        st.download_button("📥 Download CSV with Alt Text", csv, "alt_text_output.csv", "text/csv")