Create app.py

app.py

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+# app.py
+import gradio as gr
+
+# --- Units definition ---
+UNITS = {
+    "Mass": {
+        "kg": 1.0,
+        "g": 0.001,
+        "mg": 1e-6,
+        "lb": 0.45359237,
+        "oz": 0.028349523125,
+    },
+    "Length": {
+        "m": 1.0,
+        "cm": 0.01,
+        "mm": 0.001,
+        "km": 1000.0,
+        "ft": 0.3048,
+        "in": 0.0254,
+        "yd": 0.9144,
+        "mile": 1609.344,
+    },
+    "Volume": {
+        "L": 1.0,
+        "mL": 0.001,
+        "m^3": 1000.0,
+        "gal (US)": 3.785411784,
+        "cup (US)": 0.2365882365,
+        "fl oz (US)": 0.0295735295625,
+    },
+    "Time": {
+        "s": 1.0,
+        "min": 60.0,
+        "hr": 3600.0,
+        "day": 86400.0,
+    },
+    "Temperature": ["C", "F", "K"]
+}
+
+# --- Temperature conversion helper ---
+def convert_temperature(value, from_u, to_u):
+    if from_u == "C":
+        c = float(value)
+    elif from_u == "F":
+        c = (float(value) - 32.0) * 5.0 / 9.0
+    elif from_u == "K":
+        c = float(value) - 273.15
+    else:
+        raise ValueError(f"Unknown temperature unit: {from_u}")
+    if to_u == "C":
+        return c
+    elif to_u == "F":
+        return c * 9.0 / 5.0 + 32.0
+    elif to_u == "K":
+        return c + 273.15
+    else:
+        raise ValueError(f"Unknown temperature unit: {to_u}")
+
+# --- Generic conversion for linear categories ---
+def convert_value(value, from_u, to_u, category):
+    if category == "Temperature":
+        return convert_temperature(value, from_u, to_u)
+    units_map = UNITS[category]
+    if from_u not in units_map or to_u not in units_map:
+        raise ValueError("Unit not available in chosen category.")
+    value_in_base = float(value) * units_map[from_u]
+    result = value_in_base / units_map[to_u]
+    return result
+
+# --- Build Gradio UI ---
+with gr.Blocks() as demo:
+    gr.Markdown("## Unit Converter (Gradio — Hugging Face Space)\nConvert common units — no API key needed.")
+    with gr.Row():
+        category = gr.Dropdown(choices=list(UNITS.keys()), value="Length", label="Category")
+    with gr.Row():
+        value_in = gr.Number(value=1, label="Value")
+        from_unit = gr.Dropdown(choices=list(UNITS["Length"].keys()), label="From unit")
+        to_unit = gr.Dropdown(choices=list(UNITS["Length"].keys()), label="To unit")
+    precision = gr.Slider(minimum=0, maximum=10, step=1, value=4, label="Decimal places")
+    with gr.Row():
+        convert_btn = gr.Button("Convert")
+        clear_btn = gr.Button("Clear history")
+    result = gr.Textbox(label="Result", interactive=False)
+    history_box = gr.Textbox(label="History (last 20)", interactive=False)
+    history_state = gr.State([])
+
+    def update_units(selected_category):
+        if isinstance(UNITS[selected_category], dict):
+            choices = list(UNITS[selected_category].keys())
+        else:
+            choices = UNITS[selected_category]
+        default_from = choices[0]
+        default_to = choices[1] if len(choices) > 1 else choices[0]
+        return gr.update(choices=choices, value=default_from), gr.update(choices=choices, value=default_to)
+
+    category.change(fn=update_units, inputs=category, outputs=[from_unit, to_unit])
+
+    def do_convert(val, from_u, to_u, cat, prec, hist):
+        try:
+            res = convert_value(val, from_u, to_u, cat)
+            rounded = round(res, int(prec))
+            text = f"{val} {from_u} = {rounded} {to_u}"
+            hist = hist or []
+            hist.append(text)
+            hist = hist[-20:]
+            return text, "\n".join(hist), hist
+        except Exception as e:
+            return f"Error: {e}", "\n".join(hist or []), hist
+
+    convert_btn.click(
+        fn=do_convert,
+        inputs=[value_in, from_unit, to_unit, category, precision, history_state],
+        outputs=[result, history_box, history_state]
+    )
+
+    def clear_history(hist):
+        return "", "", []
+    clear_btn.click(fn=clear_history, inputs=[history_state], outputs=[result, history_box, history_state])
+
+# IMPORTANT for Spaces: don't use share=True
+if __name__ == "__main__":
+    demo.launch()