Create app.py

app.py

@@ -0,0 +1,12 @@
+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+class NumberInput(BaseModel):
+    number: float
+
+@app.post("/square")
+def compute_square(data: NumberInput):
+    result = data.number ** 2
+    return {"input": data.number, "square": result}