Circular import error python – Stack Overflow en español

estoy aprendiendo a usar Flask y Sqlalchemy y haciendo unas pruebas me sale este error: Traceback (most recent call last):
File “C:UsersUsuarioPycharmProjectspythonProjectvenvmain.py”, line 3, in
from sqlalchemy.ext.declarative import declarative_base
File “C:UsersUsuarioPycharmProjectspythonProjectvenvsqlalchemy.py”, line 1, in
from sqlalchemy import create_engine
ImportError: cannot import name ‘create_engine’ from partially initialized module ‘sqlalchemy’ (most likely due to a circular import) (C:UsersUsuarioPycharmProjectspythonProjectvenvsqlalchemy.py)

from datetime import datetime

from sqlalchemy.ext.declarative import declarative_base

from sqlalchemy.orm import sessionMaker

from sqlalchemy import Column, Integer, String, DataTime

Base = declarative_base()

class User(Base):
tablename = ‘users’

id = Column(Integer(), primary_key=True)
username = Column(String(50), nullable=False, unique=True)
email = Column(String(50), nullable=False, unique=True)
created_at = Column(DateTime(), default=datetime.now())

def __str__(self):
    return self.username

Session = sessionmaker(engine)
Session = Session()

if name == ‘main‘:

Base.metadata.drop_all(engine)
Base.metadata.create_all(engine)