Python 用Tkinter实现密码对话框

我正在尝试实现一个获取用户密码的对话框。我创建了类

PasswordDiaglog

，该类继承自

tk.Toplevel

，但这会导致问题，即它的执行是父帧的非阻塞

import Tkinter as tk

class PasswordDialog(tk.Toplevel):
    def __init__(self, parent):
        tk.Toplevel.__init__(self)
        self.password = None
        self.entry = tk.Entry(self, show='*')
        self.entry.pack()
        self.button = tk.Button(self)
        self.button["text"] = "Submit"
        self.button["command"] = self.StorePass
        self.button.pack()

    def StorePass(self):
        self.password = self.entry.get()
        self.destroy()
        print '1: Password was', self.password

class MainApplication(tk.Frame):
    def __init__(self, root):
        tk.Frame.__init__(self, root)
        self.button = tk.Button(self)
        self.button["text"] = "Password"
        self.button["command"] = self.GetPassword
        self.button.pack()

    def GetPassword(self):
        passwd = PasswordDialog(self)
        # HALT HERE 
        print '2: Password was', passwd.password

if __name__ == "__main__":
    root = tk.Tk()
    MainApplication(root).pack(side="top", fill="both", expand=True)
    root.mainloop()

通过将my code a作为密码运行，可以在终端中看到以下输出：

2: Password was None
1: Password was foobar

预期产出应为：

1: Password was foobar
2: Password was foobar

关于如何解决这个问题，或者如何实现密码对话框，您有什么想法吗

---

在输入

条目后点击回车键调用
StoredPass（）
，
将密码存储为
MainAplication
类的属性，并使用传入的
parent
作为
PasswordDialog
类的句柄，这意味着您可以使用
self.wait\u窗口（PasswordDialog（self））
要阻止执行，直到销毁
PasswordDialog
：

import Tkinter as tk

class PasswordDialog(tk.Toplevel):
    def __init__(self, parent):
        tk.Toplevel.__init__(self)
        self.parent = parent
        self.entry = tk.Entry(self, show='*')
        self.entry.bind("<KeyRelease-Return>", self.StorePassEvent)
        self.entry.pack()
        self.button = tk.Button(self)
        self.button["text"] = "Submit"
        self.button["command"] = self.StorePass
        self.button.pack()

    def StorePassEvent(self, event):
        self.StorePass()

    def StorePass(self):
        self.parent.password = self.entry.get()
        self.destroy()
        print '1: Password was', self.parent.password

class MainApplication(tk.Frame):
    def __init__(self, root):
        tk.Frame.__init__(self, root)
        self.password = None
        self.button = tk.Button(self)
        self.button["text"] = "Password"
        self.button["command"] = self.GetPassword
        self.button.pack()

    def GetPassword(self):
        self.wait_window(PasswordDialog(self))
        print '2: Password was', self.password

if __name__ == "__main__":
    root = tk.Tk()
    MainApplication(root).pack(side="top", fill="both", expand=True)
    root.mainloop()


要绑定返回键，可以使用：

self.entry.bind("<KeyRelease-Return>", self.StorePassEvent)

您也可以改用
lambda
：

self.entry.bind("<KeyRelease-Return>", lambda x: self.StorePass())

self.entry.bind（“，lambda x:self.StorePass（））

def StorePassEvent(self, event):
    self.StorePass()

self.entry.bind("<KeyRelease-Return>", lambda x: self.StorePass())