Question

我正在为一个项目开发一个GUI，一旦我把所有这些都放到一个类中，它就会回来说

    Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python33\lib\tkinter\__init__.py", line 1475, in __call__
    return self.func(*args)
  File "c:\users\ryan\documents\visual studio 2015\Projects\Group_3_Project\Group_3_Project\Group_3_Project.py", line 30, in <lambda>
    b1 = Button(root, text = 'Submit', command = (lambda e = ents: getInfo(e)))
NameError: global name 'getInfo' is not defined

到目前为止，这是我的代码：

from tkinter import*


class GUI:
    fields = 'Last Name', 'First Name', 'Field', 'Phone Number', 'Office number'

    def getInfo(entries):
        for entry in entries:
            field = entry[0]
            text = entry[1].get()
            print('%s: "%s"' % (field, text))

    def makeForm(root, fields):
        entries = []
        for field in fields:
            row = Frame(root)
            lab = Label(row, width = 15, text = field, anchor = 'w')
            ent = Entry(row)
            row.pack(side = TOP, fill = X, padx = 5, pady = 5)
            lab.pack(side = LEFT)
            ent.pack(side = RIGHT, expand = YES, fill = X)
            entries.append((field, ent))
        return entries 

    if __name__ == '__main__':
        root = Tk()
        root.wm_title("HoursWizard")
        ents = makeForm(root, fields)
        root.bind('<Return>', (lambda event, e = ents: getInfo(e)))
        b1 = Button(root, text = 'Submit', command = (lambda e = ents: getInfo(e)))
        b2 = Button(root, text = 'Quit', command = root.quit)
        b1.pack(side = LEFT, padx = 5, pady = 5)
        b2.pack(side = LEFT, padx = 5, pady = 5)
        root.mainloop()

我不知道发生了什么以及它为什么不能正常工作。我确定这是一个简单的解决方案，我只是遗漏了一些东西。任何帮助表示赞赏。谢谢！

Answer 1

您应该查看official Python tutorial并查看有关课程的部分。基本上，您的范围和名称空间不是您认为的那样。每个类方法（除非它被指定为静态）首先传递实例本身，通常用self表示。然后，您将使用self.myattribute引用实例属性。例如，在getInfo中，您所谓的entries根本不是条目，而是已创建的GUI类的实例。

我强烈建议您查看一些有关如何制作OO Tkinter应用程序的教程。它通常是这样的：

class App:
    def __init__(self, parent):
        self.parent = parent
        self.parent.after(5000, self.other_method) # just a demo
        # create buttons, lay out geometry, etc.
    def other_method(self):
        self.do_print()
    def do_print(self):
        print('hello world')

root = Tk()
app = App(root)
root.mainloop()

全球变量＆＃39; getInfo＆＃39;未定义

1 个答案: