Create app.py

app.py

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+from fastapi import FastAPI, HTTPException
+
+app = FastAPI()
+
+# Conversion functions
+def convert_length(value: float, from_unit: str, to_unit: str) -> float:
+    length_units = {"meters": 1, "kilometers": 0.001, "miles": 0.000621371, "feet": 3.28084}
+    if from_unit not in length_units or to_unit not in length_units:
+        raise ValueError("Invalid length units")
+    return value * (length_units[to_unit] / length_units[from_unit])
+
+def convert_weight(value: float, from_unit: str, to_unit: str) -> float:
+    weight_units = {"grams": 1, "kilograms": 0.001, "pounds": 0.00220462, "ounces": 0.035274}
+    if from_unit not in weight_units or to_unit not in weight_units:
+        raise ValueError("Invalid weight units")
+    return value * (weight_units[to_unit] / weight_units[from_unit])
+
+def convert_temperature(value: float, from_unit: str, to_unit: str) -> float:
+    if from_unit == "celsius" and to_unit == "fahrenheit":
+        return value * 9/5 + 32
+    elif from_unit == "fahrenheit" and to_unit == "celsius":
+        return (value - 32) * 5/9
+    elif from_unit == "celsius" and to_unit == "kelvin":
+        return value + 273.15
+    elif from_unit == "kelvin" and to_unit == "celsius":
+        return value - 273.15
+    elif from_unit == "fahrenheit" and to_unit == "kelvin":
+        return (value - 32) * 5/9 + 273.15
+    elif from_unit == "kelvin" and to_unit == "fahrenheit":
+        return (value - 273.15) * 9/5 + 32
+    elif from_unit == to_unit:
+        return value
+    else:
+        raise ValueError("Invalid temperature conversion")
+
+# API endpoints
+@app.get("/convert/{category}")
+async def convert_units(category: str, value: float, from_unit: str, to_unit: str):
+    try:
+        if category == "length":
+            result = convert_length(value, from_unit, to_unit)
+        elif category == "weight":
+            result = convert_weight(value, from_unit, to_unit)
+        elif category == "temperature":
+            result = convert_temperature(value, from_unit, to_unit)
+        else:
+            raise HTTPException(status_code=400, detail="Invalid category")
+        return {"value": value, "from_unit": from_unit, "to_unit": to_unit, "result": result}
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))