不能从一种方法返回布尔值

Question

我有一个方法，我检查用户是否存在于数据库中，我想将该方法结果传递给另一个方法，但无法这样做，错误我看到的是“类型错误：‘布尔’对象不是可调用的”

这里是我的代码：

def userInDb(username, email, password): 
    cursor = mysql.get_db().cursor() 
    cursor.execute('SELECT userID from user WHERE userName = %s and email = %s and password = %s', [username, email, password]) 
    data = cursor.fetchone() 

    if data is None: 
     return False 
    else: 
     True 

而这正是我试图调用aboves方法结果

@app.route('/showSignIn', methods=["POST"]) 
def showSignInPost(): 
    username = request.form['inputUserName'] # values received from the UI input by users 
    email = request.form['inputEmail'] 
    password = request.form['inputPassword'] 

    inDB == userInDb(username, email, password) 

    if inDB is True: 
     return render_template('signin.html', signInHeader = "User doesn't exist, please try again") 
    else: 
     return render_template('signin.html', signInHeader = "Welcome " + username) 

非常感谢即

Answer 1

你忘记返回True

def userInDb(username, email, password): 
    cursor = mysql.get_db().cursor() 
    cursor.execute('SELECT userID from user WHERE userName = %s and email = %s and password = %s', [username, email, password]) 
    data = cursor.fetchone() 

    if data is None: 
     return False 
    else: 
     return True #you forgot return 

你正在测试inDB == userInDb(...)而不是分配inDB = userInDb(...)

你也可以做if inDB:代替if inDB is True:

如果你这样做

def userInDb(username, email, password): 
    cursor = mysql.get_db().cursor() 
    cursor.execute('SELECT userID from user WHERE userName = %s and email = %s and password = %s', [username, email, password]) 
    data = cursor.fetchone() 

    return bool(data) # just return bool of data 

将会更清洁