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import random

from fastapi import Depends, FastAPI

async def dependency_a():

session_a = random.randint(1, 100)

try:

yield session_a

finally:

del session_a

async def dependency_b(dep_a=Depends(dependency_a)):

session_b_with_a = f"{dep_a}_{random.randint(1, 100)}"

try:

yield session_b_with_a

finally:

del session_b_with_a

async def dependency_c(dep_b=Depends(dependency_b)):

session_c_with_b = f"{dep_b}_{random.randint(1, 100)}"

try:

yield session_c_with_b

finally:

del session_c_with_b

app = FastAPI()

@app.get("/items/")

async def read_items(c_value: str = Depends(dependency_c)):

return [

{"c_value": c_value},

]

# PYTHONPATH=module_fastapi uvicorn fastapi_di_yield:app --reload