Create app.py

app.py

@@ -0,0 +1,11 @@
+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+class InputData(BaseModel):
+    x: float
+
+@app.post("/square")
+def double_number(data: InputData):
+    return {"result": data.x * data.x}