python多个bind在同一函数中怎么实现

我想将多个bind事件在同一个函数中实现，但是不知道怎么使用。

代码如下：

import tkinter

class Example(tkinter.Frame):
    def __init__(self, *args, **kwargs):
        tkinter.Frame.__init__(self, *args, **kwargs)
        self.l1 = tkinter.Label(self, text="Enter name")
        self.l2 = tkinter.Label(self, text="", width=40)
        self.l1.pack(side="top")
        self.l2.pack(side="top", fill="x")

        self.b1 = tkinter.Button(root, text="Ok")
        self.b2 = tkinter.Button(root, text="Ok2")
        self.b1.bind("", self.on_enter)
        self.b1.bind("", self.on_leave)
        self.b2.bind("", self.on_enter)
        self.b2.bind("", self.on_leave)
        self.b1.pack()
        self.b2.pack()

    def on_enter(self, event):
        if self.b1.bind:
            self.l2.configure(text="Check details filled before pressing Ok")
        if self.b2.bind:
            self.l2.configure(text="Check details filled before pressing Ok2")

    def on_leave(self, enter):
        if self.b1.bind:
            self.l2.configure(text="")
        if self.b2.bind:
            self.l2.configure(text="")


if __name__ =="__main__":
    root = tkinter.Tk()
    Example(root).pack(side="top", fill="both", expand="true")
    root.mainloop()

运行结果：

import tkinter

class Example(tkinter.Frame):
    def __init__(self, *args, **kwargs):
        tkinter.Frame.__init__(self, *args, **kwargs)
        self.l1 = tkinter.Label(self, text="Enter name")
        self.l2 = tkinter.Label(self, text="", width=40)
        self.l1.pack(side="top")
        self.l2.pack(side="top", fill="x")
        self.b1 = tkinter.Button(root, text="Ok")
        self.b2 = tkinter.Button(root, text="Ok2")
        self.b1.bind("<Enter>", self.on_enter)
        self.b1.bind("<Leave>", self.on_leave)
        self.b2.bind("<Enter>", self.on_enter)
        self.b2.bind("<Leave>", self.on_leave)
        self.b1.pack()
        self.b2.pack()
    def on_enter(self, event):
        if event.widget == self.b1:
            self.l2.configure(text="Check details filled before pressing Ok")
        elif event.widget == self.b2:
            self.l2.configure(text="Check details filled before pressing Ok2")
    def on_leave(self, enter):
        if event.widget == self.b1:
            self.l2.configure(text="")
        elif event.widget == self.b2:
            self.l2.configure(text="")

if __name__ == "__main__":
    root = tkinter.Tk()
    Example(root).pack(side="top", fill="both", expand="true")
    root.mainloop()