Python "with" 语句中的变量范围

Question

我的代码中有一个 with 语句：

@app.route('/users', methods = ['POST'])
def registerUser():

    ....

    if email is None:
        errorsList.append(Error("email","Email address not entered"))
    else:       
        # Check if email address is already in database
        with contextlib.closing(DBSession()) as session:        
            if session.query(USER).filter_by(USEREMAIL=email).count():
                errorsList.append(Error("email","This email address already exists"))

    # Add user to database
    user = USER(email,password)
    session.add(user)
    session.commit()

当我运行这段代码时，它工作正常。但是，我预计会发生错误，因为我认为 session 会超出 with 语句的范围，因此 undefined?

我没有在此函数内或全局范围内的其他任何地方定义 session。

Answer 1

Python 变量保持在范围内，直到方法结束。 python

范围内没有 'blocks'

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