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Каролина
Asked:2020-04-06 03:26:06 +0000 UTC2020-04-06 03:26:06 +0000 UTC

为什么 Python 字典函数可以在不调用它们的情况下工作

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我正在为我在 tkinter 和 python 中的需要编写一个程序。单击按钮时，getParameters 函数应在循环中将数组的值与字典进行比较。如果数组的某个值与字典的键匹配，则从字典中调用该键的函数。但事实上，程序的工作方式是程序调用字典中的所有函数，而不需要循环参与。请告诉我如何解决它。请不要注意程序界面稀少的事实。这是故意这样做的，以便可以看到问题的本质。

 from tkinter import *
    win2 = Tk()

    def receive_of_word():
        param = "55"
        return param

    def word(param):
        x = 5
        print(x)
        return x

    def word_2(param):
        y = 10
        print(y)
        return y

    def getParameters():
        ex ={
          "xx": word(receive_of_word()),
          "yy": word_2(receive_of_word()),
          }

        a = ["xx", "zz"]

        for i in a:
            if i in ex:
                ex[i]


    win2.title('Программа')
    win2.minsize(width = 600, height = 600)
    win2.maxsize(width = 600, height = 600)

    button2 = Button(win2, text = "Считать текст", command = getParameters, width = 20, height = 3, font = "Arial 8", bg = "#edf3fc", foreground = "#000000", activebackground = "#ffffff", relief = RAISED)
    button2.place(relx = 0.35, rely = 0.56)
    button2.bind()

    mainloop()
python

1 个回答

  1. Best Answer

    这是因为在您声明字典的地方，您已经在调用这些函数。为了不调用函数，而是将它们转移到某个地方，不带括号，只写名字。在需要调用它们的地方 - 已经写了括号。并且由于param某种原因，您的参数根本没有在wordand函数中使用word_2，但在这种情况下它不会影响结果。

    from tkinter import *
win2 = Tk()

def receive_of_word():
    param = "55"
    return param

def word(param):
    x = 5
    print(x)
    return x

def word_2(param):
    y = 10
    print(y)
    return y

def getParameters():
    ex ={
      "xx": (word,receive_of_word),
      "yy": (word_2,receive_of_word),
    }

    a = ["xx", "zz"]

    for i in a:
        if i in ex:
            f1,f2 = ex[i]
            f1(f2())


win2.title('Программа')
win2.minsize(width = 600, height = 600)
win2.maxsize(width = 600, height = 600)

button2 = Button(win2, text = "Считать текст", command = getParameters, width = 20, height = 3, font = "Arial 8", bg = "#edf3fc", foreground = "#000000", activebackground = "#ffffff", relief = RAISED)
button2.place(relx = 0.35, rely = 0.56)
button2.bind()

mainloop()
    • 2

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