Create app.py

app.py

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+import gradio as gr
+
+# -------------------------------
+# Conversion Functions
+# -------------------------------
+def kg_to_g(value): return value * 1000
+def g_to_kg(value): return value / 1000
+
+def m_to_cm(value): return value * 100
+def cm_to_m(value): return value / 100
+def m_to_ft(value): return value * 3.280839895013123
+def ft_to_m(value): return value / 3.280839895013123
+
+def c_to_f(value): return (value * 9/5) + 32
+def f_to_c(value): return (value - 32) * 5/9
+
+# -------------------------------
+# Conversion Dispatcher
+# -------------------------------
+def convert_value(category, from_unit, to_unit, input_value):
+    try:
+        x = float(input_value)
+    except:
+        return "⚠️ Please enter a valid numeric value."
+
+    if category == "Mass":
+        if from_unit == "kg" and to_unit == "g":
+            return f"{x} kg = {kg_to_g(x)} g"
+        elif from_unit == "g" and to_unit == "kg":
+            return f"{x} g = {g_to_kg(x)} kg"
+        elif from_unit == to_unit:
+            return f"{x} {from_unit} = {x} {to_unit}"
+        else:
+            return "Conversion not supported for Mass."
+
+    elif category == "Length":
+        if from_unit == "m" and to_unit == "cm":
+            return f"{x} m = {m_to_cm(x)} cm"
+        elif from_unit == "cm" and to_unit == "m":
+            return f"{x} cm = {cm_to_m(x)} m"
+        elif from_unit == "m" and to_unit == "ft":
+            return f"{x} m = {round(m_to_ft(x), 4)} ft"
+        elif from_unit == "ft" and to_unit == "m":
+            return f"{x} ft = {round(ft_to_m(x), 4)} m"
+        elif from_unit == to_unit:
+            return f"{x} {from_unit} = {x} {to_unit}"
+        else:
+            return "Conversion not supported for Length."
+
+    elif category == "Temperature":
+        if from_unit == "°C" and to_unit == "°F":
+            return f"{x} °C = {round(c_to_f(x), 2)} °F"
+        elif from_unit == "°F" and to_unit == "°C":
+            return f"{x} °F = {round(f_to_c(x), 2)} °C"
+        elif from_unit == to_unit:
+            return f"{x} {from_unit} = {x} {to_unit}"
+        else:
+            return "Conversion not supported for Temperature."
+
+    else:
+        return "Unknown category."
+
+# -------------------------------
+# Gradio Interface
+# -------------------------------
+categories = ["Mass", "Length", "Temperature"]
+units_map = {
+    "Mass": ["kg", "g"],
+    "Length": ["m", "cm", "ft"],
+    "Temperature": ["°C", "°F"]
+}
+
+def update_units(cat):
+    return (
+        gr.update(choices=units_map[cat], value=units_map[cat][0]),
+        gr.update(choices=units_map[cat], value=units_map[cat][1])
+    )
+
+with gr.Blocks(title="Unit Converter") as demo:
+    gr.Markdown("# 🧮 Unit Converter\n### Convert mass, length, and temperature easily!\nBuilt with **Python + Gradio** (no APIs).")
+    
+    with gr.Row():
+        category = gr.Dropdown(label="Category", choices=categories, value="Mass")
+        from_unit = gr.Dropdown(label="From unit", choices=units_map["Mass"], value="kg")
+        to_unit = gr.Dropdown(label="To unit", choices=units_map["Mass"], value="g")
+    
+    value = gr.Textbox(label="Value to convert", placeholder="Enter a number like 10")
+    convert_btn = gr.Button("Convert")
+    output = gr.Textbox(label="Result")
+
+    category.change(update_units, inputs=category, outputs=[from_unit, to_unit])
+    convert_btn.click(convert_value, inputs=[category, from_unit, to_unit, value], outputs=output)
+
+demo.launch()