python变量tkinter

Question

我是一个新的im，刚刚开始学习类和tkinter，所以请原谅我的代码“乱七八糟”。我正在尝试输入一些字符串到字段nr1中，在单击一个按钮后，在控制台中打印这个字符串，并将这个值存储起来供以后使用：

from tkinter import Tk, BOTH, RIGHT, RAISED, BOTTOM, TOP, X, StringVar
from tkinter.ttk import Frame, Button, Entry


class AD(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent, v=None, raw_input=None)
        self.parent = parent
        self.parent.geometry("250x150+300+300")
        self.parent.title("Trolollo")
        self.parent.resizable(False, False)
        self.inp = None
        self.v = StringVar()
        self.raw_input = None

        self.initUI()

    def user_input(self):
        global inp
        a = self.raw_input(self.v.get())
        inp = a
        return inp


    def initUI(self):
        self.pack(fill=BOTH, expand=True)

        frame = Frame(self, relief=RAISED, borderwidth=0)
        frame.pack(fill=BOTH, expand=True)

        self.entry1 = Entry(frame, textvariable=self.v)
        self.entry1.pack(side=TOP, fill=X, expand=False, padx=2, pady=2)
        self.entry1.focus_set()

        rename_button = Button(frame, text="Dispaly text", command =         self.user_input())
        rename_button.pack(side=TOP, expand=False, padx=2, pady=2)

        entry2 = Entry(frame)
        entry2.pack(side=TOP, fill=X, expand=False, padx=2, pady=2)


        quit_button = Button(self, text="Quit", command=self.quit)
        quit_button.pack(side=RIGHT, padx=5, pady=5)

        ok_button = Button(self, text="OK")
        ok_button.pack(side=RIGHT, padx=5, pady=5)


def main():
    root = Tk()


    app = AD(root)
    root.mainloop()


if __name__ == '__main__':
    main()

执行代码后，我得到: TypeError：'NoneType‘对象不可调用

任何帮助我都会感激

Answer 1

问题：

1. 重命名按钮的选项"command=self.user_input()“中的第一个问题。应该命名该函数，而不是执行该函数。放置()符号意味着您在加载代码时执行该函数，即一旦w/o按下重命名按钮即可执行该函数。
2. 第二个问题是函数user_input中的错误代码。这导致了您的错误消息。

答案：代码与建议的更正。

from tkinter import *
from tkinter.ttk import *


class AD(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent, v=None, raw_input=None)
        self.parent = parent
        self.parent.geometry("250x150+300+300")
        self.parent.title("Trolollo")
        self.parent.resizable(False, False)
        self.inp = None
        self.v = StringVar()
        self.raw_input = None

        self.initUI()

    def user_input(self):
        # Get entry1 value, store it as an attribute and print to console
        self.raw_input = self.v.get()
        print(self.raw_input)


    def initUI(self):
        self.frame = Frame(self, relief=RAISED, borderwidth=0)
        self.frame.pack(fill=BOTH, expand=True)

        self.entry1 = Entry(self.frame, textvariable=self.v)
        self.entry1.pack(side=TOP, fill=X, expand=False, padx=2, pady=2)
        self.entry1.focus_set()


        #self.rename_button = Button(self.frame, text="Dispaly text",
        #                            command = self.user_input())
        self.rename_button = Button(self.frame, text="Display text",
                                    command = self.user_input)
        self.rename_button.pack(side=TOP, expand=False, padx=2, pady=2)


        # You can remove the triple quotes to display these widgets 
        """
        self.entry2 = Entry(self.frame)
        self.entry2.pack(side=TOP, fill=X, expand=False, padx=2, pady=2)


        self.quit_button = Button(self.frame, text="Quit", command=self.quit)
        self.quit_button.pack(side=RIGHT, padx=5, pady=5)

        self.ok_button = Button(self.frame, text="OK")
        self.ok_button.pack(side=RIGHT, padx=5, pady=5)

        """

        self.pack(fill=BOTH, expand=True)


def main():
    root = Tk()


    app = AD(root)
    root.mainloop()

您的GUI：

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SUGGESTIONS:

• 别忘了把自己。在你的小工具前面。
• 每次测试一个小部件，以帮助您调试代码。