pwd = b64decode(self.text).decode('utf-8')

This line of code is decoding a Base64 encoded string (which is stored in the variable `self.text`) and then decoding it into a UTF-8 encoded string. The resulting string is then stored in the variable `pwd`.

Note that `b64decode()` is a function from the `base64` module in Python, which takes a Base64 encoded string as input and returns the decoded bytes. The `decode()` method is then called on these bytes to convert them into a UTF-8 encoded string.

相关问题

from tkinter import * import tkinter.messagebox as messagebox class LoginFrame(Frame): def __init__(self, master=None): super().__init__(master) self.master = master self.master.title('登录') self.master.geometry('300x200') self.create_widgets() def create_widgets(self): self.label_user = Label(self.master, text='用户名:') self.label_user.pack() self.entry_user = Entry(self.master) self.entry_user.pack() self.label_pwd = Label(self.master, text='密码:') self.label_pwd.pack() self.entry_pwd = Entry(self.master, show='*') self.entry_pwd.pack() self.btn_login = Button(self.master, text='登录', command=self.login) self.btn_login.pack() self.btn_register = Button(self.master, text='注册', command=self.register) self.btn_register.pack() def login(self): user = self.entry_user.get() pwd = self.entry_pwd.get() # 在这里可以添加验证逻辑 messagebox.showinfo('登录成功', '欢迎回来，%s' % user) def register(self): # 在这里添加注册逻辑 messagebox.showinfo('注册成功', '注册成功，请登录！') root = Tk() login_frame = LoginFrame(root) login_frame.pack() root.mainloop() 在里面用python加入简单的注册逻辑的

好的，以下是一个集成了注册逻辑的 Python 代码示例：

from tkinter import *
import tkinter.messagebox as messagebox

class LoginFrame(Frame):
    def __init__(self, master=None):
        super().__init__(master)
        self.master = master
        self.master.title('登录')
        self.master.geometry('300x200')
        self.create_widgets()

    def create_widgets(self):
        self.label_user = Label(self.master, text='用户名:')
        self.label_user.pack()
        self.entry_user = Entry(self.master)
        self.entry_user.pack()

        self.label_pwd = Label(self.master, text='密码:')
        self.label_pwd.pack()
        self.entry_pwd = Entry(self.master, show='*')
        self.entry_pwd.pack()

        self.btn_login = Button(self.master, text='登录', command=self.login)
        self.btn_login.pack()

        self.btn_register = Button(self.master, text='注册', command=self.register)
        self.btn_register.pack()

    def login(self):
        user = self.entry_user.get()
        pwd = self.entry_pwd.get()
        # 在这里可以添加验证逻辑
        messagebox.showinfo('登录成功', '欢迎回来，%s' % user)

    def register(self):
        user = self.entry_user.get()
        pwd = self.entry_pwd.get()
        # 在这里添加注册逻辑
        if user.strip() == '' or pwd.strip() == '':
            messagebox.showerror('注册失败', '用户名和密码不能为空！')
        elif user in users:
            messagebox.showerror('注册失败', '该用户名已存在！')
        else:
            users[user] = pwd
            messagebox.showinfo('注册成功', '注册成功，请登录！')

root = Tk()
users = {}  # 存储用户信息的字典，键为用户名，值为密码
login_frame = LoginFrame(root)
login_frame.pack()
root.mainloop()

以上代码中，我们在 `register` 函数中添加了注册逻辑，包括判断用户名和密码是否为空、判断用户名是否已存在、在 `users` 字典中添加新用户等步骤。同时，我们也对注册成功和失败进行了相应的提示。

NpgsqlConnection conn = new NpgsqlConnection(SqlHelper.sqlcon); NpgsqlCommand sqlCmd = new NpgsqlCommand(); //创建执行sql的对象 try { conn.Open(); string sql = "update login set login_no='" + yhbh.Text.Trim() + "',login_name='" + yhmc.Text.Trim() + "',login_pwd='" + yhmm.Text.Trim() + "',login_dept='" + bm.Text.Trim() + "',login_job='" + zw.Text.Trim() + "',login_nation='" + textBox11.Text.Trim() + "',login_birthday='" + dateTimePicker1.Text.Trim() + "',login_phone='" + dh.Text.Trim() + "',login_mail='" + yx.Text.Trim() + "' where login_no='" + dataInfo.No + "'"; sqlCmd = new NpgsqlCommand(sql, conn); sqlCmd.ExecuteNonQuery(); MessageBox.Show("修改成功!", "提示"); } catch (Exception ex2) { MessageBox.Show("连接数据库发生错误：" + ex2.ToString(), "错误！"); } finally { sqlCmd.Dispose(); conn.Close(); button2_Click_1(this, e); }转化

以下是可能的另一种实现方式：

using (NpgsqlConnection conn = new NpgsqlConnection(SqlHelper.sqlcon))
using (NpgsqlCommand sqlCmd = new NpgsqlCommand("UPDATE login SET login_no = @login_no, login_name = @login_name, login_pwd = @login_pwd, login_dept = @login_dept, login_job = @login_job, login_nation = @login_nation, login_birthday = @login_birthday, login_phone = @login_phone, login_mail = @login_mail WHERE login_no = @old_login_no", conn))
{
    sqlCmd.Parameters.AddWithValue("@login_no", yhbh.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_name", yhmc.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_pwd", yhmm.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_dept", bm.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_job", zw.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_nation", textBox11.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_birthday", dateTimePicker1.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_phone", dh.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@login_mail", yx.Text.Trim());
    sqlCmd.Parameters.AddWithValue("@old_login_no", dataInfo.No);
    try
    {
        conn.Open();
        int rowsAffected = sqlCmd.ExecuteNonQuery();
        if (rowsAffected > 0)
        {
            MessageBox.Show("修改成功!", "提示");
            button2_Click_1(this, e);
        }
        else
        {
            MessageBox.Show("未找到对应的用户记录!", "提示");
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show("连接数据库发生错误：" + ex.ToString(), "错误！");
    }
}

该代码片段使用了 `using` 语句块来确保 `NpgsqlConnection` 和 `NpgsqlCommand` 对象被正确释放。另外，该代码片段使用了参数化查询来避免 SQL 注入攻击，并且在执行更新操作后检查受影响的行数，根据情况显示不同的提示信息。