update (frameworks/fastapi): two versions and documentation

frameworks/fastapi/README.md

@@ -1,5 +1,22 @@
 # FastAPI
+https://fastapi.tiangolo.com/
+
+# Installing
+
+This statement forces a specific version of FastAPI installation when the default is not the latest.
 
 ~~~
 pip3 install "fastapi[standard]"==0.112.0
+~~~
+
+# Simple Example
+
+* Version for Python 3.7+ using `Union[ ]` for optional fields:
+~~~
+fastapi dev main_3_07.py
+~~~
+
+* Version for Python 3.10+ using `type | None` for optional fields:
+~~~
+fastapi dev main_3_10.py
 ~~~

frameworks/fastapi/basic/main.py → frameworks/fastapi/basic/main_3_07.py

@@ -4,12 +4,10 @@
 
 app = FastAPI()
 
-
 @app.get("/")
 def read_root():
     return {"Hello": "World"}
 
-
 @app.get("/items/{item_id}")
 def read_item(item_id: int, q: Union[str, None] = None):
-    return {"item_id": item_id, "q": q}
+    return {"item_id": item_id, "q": q}

frameworks/fastapi/basic/main_3_10.py

@@ -0,0 +1,11 @@
+from fastapi import FastAPI
+
+app = FastAPI()
+
+@app.get("/")
+def read_root():
+    return {"Hello": "World"}
+
+@app.get("/items/{item_id}")
+def read_item(item_id: int, q: str | None = None):
+    return {"item_id": item_id, "q": q}