我正在Kivy中创建一个允许用户登录或创建新帐户的Python程序。我有一个Python程序引用的MySQL用户名和密码表(通过PyMySQL)。当新用户输入已存在的用户名时,Python会遍历MySQL表中的每个用户名,如果用户名已经存在,Python会要求用户输入新密码。问题是,当用户尝试输入新用户名并且Python再次运行代码时,我得到“TypeError:'unicode'对象不可调用”。我很困惑,因为如果用户第一次输入一个尚未存在的用户名,我就没有错误。当他们再次尝试输入用户名时,我收到错误消息。
这是我的.py主文件代码块,它给我带来了问题:
#Select all usernames from the database with the execute method
cur.execute("""SELECT username FROM patient_login""")
#Use the fetchall() method to get a list dictionary of all usernames
self.usernames_from_db = cur.fetchall()
#For each of the names in the list/dict of usernames
for names in self.usernames_from_db:
#If the names username is equal to the username the user created
if names['username'] == self.new_patient_username:
#Display an error if username exists
self.root.ids.new_username_error_box.text = 'Username taken'
#Empty the username TextInput box
self.root.ids.new_patient_username.text = ''
#Empty the password TextInput box
self.root.ids.new_patient_password.text = ''
#Else store the username
else:
cur.execute("""INSERT INTO patient_login (username,
password) VALUES ("%s", "%s")"""
%s(self.new_patient_username,
self.new_patient_password))
#Commit to database
user_db_conn.commit()#Commit it to the database
#Select the ID for the username with the execute method
cur.execute("""SELECT ID FROM patient_login WHERE username="%s"
"""%(self.new_patient_username))
#Use the fetchall() method to get the ID stored into a list dict
self.user_id_dict = cur.fetchall()
#Get the 0 (first) index in the dictionary of ID's.
self.user_id_index = self.user_id_dict[0]
#Get the 'ID' VALUE in the key value pair of the ID dict. Make
self.user_id_string = str(self.user_id_index['ID'])
#Get the integer value of the user id as well
self.user_id_integer = int(self.user_id_string)
#Display the ID in a TextInput Box so that the user knows their
self.root.ids.new_username_error_box.text = self.user_id_string
这是我的.kv代码:
Screen:
name: 'Create_Username'
GridLayout:
rows: 4
columns: 2
spacing: 2
padding: 2
Label:
text: 'Username'
TextInput:
text:''
id: new_patient_username
Label:
text:'Password'
TextInput:
text:''
id: new_patient_password
TextInput:
text:''
id:new_username_error_box
Button:
text: 'Enter Data'
on_release: app.new_patient_username()
background_normal: 'red_button_background.jpg'
Button:
text:'Continue'
on_release: root.current = 'Create_Account'
background_normal: 'red_button_background.jpg'
Button:
text: 'Back'
on_release: root.current = 'Sign_In_To_Account'
background_normal: 'red_button_background.jpg'
当他们输入新用户名时,这是我得到的回溯:
on_release: app.new_patient_username()
TypeError: 'unicode' object is not callable
如您所见,当用户第二次按下“存储数据”按钮时,会发生一个跟踪簿。但是,当他们第一次按下按钮并尝试存储用户名和密码时,不会发生错误。
答案 0 :(得分:2)
踢自己。我的函数名称与我函数中的变量名称相匹配。当我调用函数时,它调用变量(不能调用字符串/ Unicode对象),而不是调用函数。我只是更改了函数的名称,代码运行正常。