尝试合并，所有代码需要调整from后文件路径。

students/api/students_api.py

@@ -6,9 +6,9 @@ from students.model.students_model import *
 from students.schema.students_request import *
 from students.databases import *
 
-students_api = APIRouter()
+s_api = APIRouter()
 
-@students_api.get("/students"
+@s_api.get("/students"
     ,summary='学生资料查询'
     ,description=f'筛选条件全为空即查询所有学生资料，输入薪资会查询大于输入薪资以上的学生。\n '
                  f'时间格式：YYYY-MM-DD'
@@ -24,7 +24,7 @@ def get_students( stu:StudentsQuery = Depends()
     raise HTTPException(status_code=404, detail="没有找到符合条件的学生")
 
 
-@students_api.post("/students"
+@s_api.post("/students"
     ,summary='新增学生资料'
     ,description=f'学生ID自动分配，学生姓名、学生手机号和班级是必填项，不能为空。\n '
                  f'时间格式：YYYY-MM-DD'
@@ -38,7 +38,7 @@ def add_student( stu:StudentsResponse = Depends()
         raise HTTPException(status_code=500, detail='手机号已有学生使用或必填项为空。')
     return result
 
-@students_api.put("/students"
+@s_api.put("/students"
     ,summary='学生资料更新'
     ,description=f'请输入需要更新信息的学生ID，学生手机号不可重复，填写即更新，为空即不更新。\n '
                  f'时间格式：YYYY-MM-DD'
@@ -52,7 +52,7 @@ def get_students( stu:StudentsUpdate = Depends()
         raise HTTPException(status_code=500, detail='手机号已有学生使用。')
     return result
 
-@students_api.delete("/students"
+@s_api.delete("/students"
     ,summary='删除学生资料'
     ,description=f'输入需要删除的学生信息，删除条件任选，但不可全为空，工资筛选能删除大于等于输入工资的所有人。\n '
                  f'时间格式：YYYY-MM-DD'

students/databases.py

@@ -3,7 +3,17 @@
 from sqlalchemy import *
 from sqlalchemy.orm import sessionmaker,declarative_base
 
-db_url = "mysql+pymysql://root:420821@localhost:3306/student_manage_system?charset=utf8mb4"
+# 导入.env参数
+import os
+from dotenv import load_dotenv
+load_dotenv( )
+DB_USER = os.getenv("DB_USER", "root")
+DB_PASSWORD = os.getenv("DB_PASSWORD", "")
+DB_HOST = os.getenv("DB_HOST", "localhost")
+DB_PORT = os.getenv("DB_PORT", "3306")
+DB_NAME = os.getenv("DB_NAME", "student_manage_system")
+
+db_url = f"mysql+pymysql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}?charset=utf8mb4"
 
 engine1 = create_engine(db_url)
 

students/main.py

@@ -1,9 +1,11 @@
-from fastapi import FastAPI
-from students.api.students_api import students_api
+from fastapi import FastAPI,APIRouter
+from students.api.students_api import s_api
 from students.databases import *
 from students.model import students_model
 from contextlib import asynccontextmanager
 
+Students_API = APIRouter()
+
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     Base.metadata.create_all(engine1)
@@ -12,14 +14,13 @@ async def lifespan(app: FastAPI):
 
 app = FastAPI(title="学生管理系统",lifespan=lifespan) # 这里必须把上面写的加上
 
-app.include_router(students_api,tags=["students"])
-
-
-def main():
-    print("Hello from student-manage-system!")
+app.include_router(s_api,tags=["students"])
 
 
 if __name__ == "__main__":
+    def main():
+        print("Hello from student-manage-system!")
+
     import uvicorn
     uvicorn.run("main:app", host="0.0.0.0", port=51000)