Question

我有以下OptionMenu：

    self.wcartsn = StringVar(self.frame1)                                                  
    self.e1 = OptionMenu(self.frame1, self.wcartsn, *watercarts, command=(self.wcart, lambda selection:self.other_entry(selection,'wcartsn',10,6)))   
    self.e1.grid(row=10, column=5, stick=E+W)

这实际上不起作用，但它使我的问题清楚。 如何（如果可能的话）从一个OptionMenu调用多个函数？此函数提供错误TypeError: 'tuple' object is not callable

Answer 1

你可以创建一个函数来依次调用你的多个函数：

def compose(functions):
    """
    returns a single function composed from multiple functions.
    calling the returned function will execute each of the functions in the order you gave them.
    """
    def f(*args, **kargs):
        for function in functions:
            function(*args, **kargs)
    return f


self.e1 = OptionMenu(self.frame1, self.wcartsn, *watercarts, command=compose(self.wcart, lambda selection:self.other_entry(selection,'wcartsn',10,6)))

Answer 2

最简单的解决方案 - 也是最容易维护的解决方案 - 是创建一个调用其他函数的函数：

def __init__(self):
    ...
    self.wcartsn = StringVar(self.frame1)                                                  
    self.e1 = OptionMenu(self.frame1, self.wcartsn, *watercarts, command=self.wcartsnCallback)   
    ...

def wcartsnCallback(self, selection):
    self.wcart()
    self.other_entry(selection,'wcartsn',10,6)

你能为Tkinter OptionMenu分配多个命令吗？

2 个答案: