Spaces:
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# app.py
"""Simple Unit Converter (Gradio) for Hugging Face Spaces.
- Put this file at the repo root as `app.py` (Spaces uses this as the entry point).
- Minimal dependencies: gradio only.
"""
import gradio as gr
# --- Unit factors to a base unit ---
UNITS = {
"Mass": {
"kg": 1.0,
"g": 0.001,
"lb (pound)": 0.45359237,
"oz (ounce)": 0.028349523125
},
"Length": {
"m": 1.0,
"cm": 0.01,
"mm": 0.001,
"ft (foot)": 0.3048,
"in (inch)": 0.0254
},
"Volume": {
"L (liter)": 1.0,
"mL (milliliter)": 0.001,
"US gallon": 3.785411784,
"US quart": 0.946352946
},
# Temperature handled with formulas instead of factors
"Temperature": ["C", "F", "K"]
}
def update_units(category):
"""Update From/To dropdowns when Category changes."""
if category == "Temperature":
choices = UNITS["Temperature"]
else:
choices = list(UNITS[category].keys())
from_default = choices[0]
to_default = choices[1] if len(choices) > 1 else choices[0]
return gr.update(choices=choices, value=from_default), gr.update(choices=choices, value=to_default)
def convert(value, category, from_unit, to_unit, precision):
"""Convert `value` from `from_unit` to `to_unit` inside `category`."""
# Input validation
try:
val = float(value)
except Exception:
return "❗ Enter a valid number."
# quick return if same unit
if from_unit == to_unit:
fmt = f"{{:.{precision}f}}"
return f"{fmt.format(val)} {from_unit} = {fmt.format(val)} {to_unit}"
# Temperature conversions (Celsius as intermediate)
if category == "Temperature":
# to Celsius
if from_unit == "C":
c = val
elif from_unit == "F":
c = (val - 32) * 5.0 / 9.0
elif from_unit == "K":
c = val - 273.15
else:
return "❗ Unknown temperature unit."
# from Celsius to target
if to_unit == "C":
res = c
elif to_unit == "F":
res = c * 9.0 / 5.0 + 32
elif to_unit == "K":
res = c + 273.15
else:
return "❗ Unknown temperature unit."
else:
# factor-based conversion: value -> base -> target
factors = UNITS[category]
try:
f_from = factors[from_unit]
f_to = factors[to_unit]
except KeyError:
return "❗ Unknown unit for selected category."
value_in_base = val * f_from
res = value_in_base / f_to
fmt = f"{{:.{precision}f}}"
return f"{fmt.format(val)} {from_unit} = {fmt.format(res)} {to_unit}"
# --- Build Gradio UI ---
with gr.Blocks() as demo:
gr.Markdown("## 🔁 Simple Unit Converter\nChoose category, units, value, then press Convert.")
with gr.Row():
category_dd = gr.Dropdown(choices=list(UNITS.keys()), value="Mass", label="Category")
precision = gr.Slider(minimum=0, maximum=6, step=1, value=4, label="Decimals")
with gr.Row():
from_dd = gr.Dropdown(choices=list(UNITS["Mass"].keys()), value="kg", label="From unit")
to_dd = gr.Dropdown(choices=list(UNITS["Mass"].keys()), value="g", label="To unit")
value_in = gr.Number(value=1.0, label="Value to convert")
convert_btn = gr.Button("Convert")
output_txt = gr.Textbox(label="Result", interactive=False)
# callbacks
category_dd.change(fn=update_units, inputs=category_dd, outputs=[from_dd, to_dd])
convert_btn.click(fn=convert, inputs=[value_in, category_dd, from_dd, to_dd, precision], outputs=output_txt)
# Entry point for Spaces
if __name__ == "__main__":
demo.launch()
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