Question

我是Tkinter的新手，我在While-loop导入数据def save.时遇到问题这是一个例子。我有两个数字变量Variable 1和Variable 2，它们需要是：

numeric（空和字符串无效）。当V1或V2不是有效的消息窗口出现。
当变量2大于80时，会出现一条消息并询问a 确认。

我有问题要了解这是否是最好的方法以及如何定位休息

from Tkinter import *
import tkMessageBox


class MainWindow(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.master.title("input")
        self.master.minsize(250, 150)
        self.grid(sticky=E+W+N+S)

        self.res=StringVar()
        self.res.set("---")

        top=self.winfo_toplevel()
        top.rowconfigure(0, weight=1)
        top.columnconfigure(0, weight=1)

        for i in range(4):self.rowconfigure(i, weight=1)
        self.columnconfigure(1, weight=1)

        self.label0 = Label(self, text="value 1   ")
        self.label0.grid(row=0, column=0, padx=2)

        self.entry0 = Entry(self)
        self.entry0.grid(row=0, column=1, pady=2, padx=2, sticky=E+W+N+S)

        self.label1 = Label(self, text="value 2   ")
        self.label1.grid(row=1, column=0, padx=2)

        self.entry1 = Entry(self)
        self.entry1.grid(row=1, column=1, pady=2, padx=2, sticky=E+W+N+S)

        self.button1 = Button(self, text="Save", command=self.save)
        self.button1.grid(row=2, column=0, columnspan=2, pady=2, padx=2, sticky=E+W+N+S)

        self.result = Label(self, textvariable=self.res)
        self.result.grid(row=3, column=0, columnspan=2, pady=2, padx=2, sticky=E+W+N+S)

    def save(self):
        while True:
            v1 = self.entry0.get()
            if not v1:
                tkMessageBox.showwarning(title="Warning message box", message="The Value 1 is empty")
            else:
                try:
                    v1 = float(v1)
                    break
                except:
                    tkMessageBox.showwarning(title="Warning message box", message="The value 1 is not a numeric value")
        while True:
            v2 = self.entry1.get()
            if not v2:
                tkMessageBox.showwarning(title="Warning message box", message="The Value 2 is empty")
            else:
                try:
                    v2 = float(v2)
                    if v2 >= 80:
                        if tkMessageBox.askyesno(title="Value 2",message="The value 2 is %s. Are you sure?" % v2) == 1:
                            v2 = v2
                            break
                    else:
                        break
                except:
                    tkMessageBox.showwarning(title="Warning message box", message="The value 2 is not a numeric value")
        self.res.set(str(v1 * v2))

if __name__=="__main__":
   d=MainWindow()
   d.mainloop()

Answer 1

删除while循环。
由于现在没有循环，请删除break。
相应地缩进。

您的最终代码可能如下所示：

from Tkinter import *
import tkMessageBox


class MainWindow(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.master.title("input")
        self.master.minsize(250, 150)
        self.grid(sticky=E+W+N+S)

        self.res=StringVar()
        self.res.set("---")

        top=self.winfo_toplevel()
        top.rowconfigure(0, weight=1)
        top.columnconfigure(0, weight=1)

        for i in range(4):self.rowconfigure(i, weight=1)
        self.columnconfigure(1, weight=1)

        self.label0 = Label(self, text="value 1   ")
        self.label0.grid(row=0, column=0, padx=2)

        self.entry0 = Entry(self)
        self.entry0.grid(row=0, column=1, pady=2, padx=2, sticky=E+W+N+S)

        self.label1 = Label(self, text="value 2   ")
        self.label1.grid(row=1, column=0, padx=2)

        self.entry1 = Entry(self)
        self.entry1.grid(row=1, column=1, pady=2, padx=2, sticky=E+W+N+S)

        self.button1 = Button(self, text="Save", command=self.save)
        self.button1.grid(row=2, column=0, columnspan=2, pady=2, padx=2, sticky=E+W+N+S)

        self.result = Label(self, textvariable=self.res)
        self.result.grid(row=3, column=0, columnspan=2, pady=2, padx=2, sticky=E+W+N+S)

    def save(self):
            v1 = self.entry0.get()
            if not v1:
                tkMessageBox.showwarning(title="Warning message box", message="The Value 1 is empty")
            else:
                try:
                    v1 = float(v1)
                except:
                    tkMessageBox.showwarning(title="Warning message box", message="The value 1 is not a numeric value")

            v2 = self.entry1.get()
            if not v2:
                tkMessageBox.showwarning(title="Warning message box", message="The Value 2 is empty")
            else:
                try:
                    v2 = float(v2)
                    if v2 >= 80:
                        if tkMessageBox.askyesno(title="Value 2",message="The value 2 is %s. Are you sure?" % v2) == 1:
                            v2 = v2
                    else:
                        pass
                except:
                    tkMessageBox.showwarning(title="Warning message box", message="The value 2 is not a numeric value")
            self.res.set(str(v1 * v2))

if __name__=="__main__":
    d=MainWindow()
    d.mainloop()

Answer 2

我不会在save（）函数中使用While循环。 mainloop（）使表单保持打开状态。摆脱那些While循环，它们不是必需的，当你单击没有值的按钮时它会在无限循环中运行。此外，您可以使用IntVar（）而不是StringVar（）来避免转换浮动然后转换为字符串。

while循环在Tkinter中用Python插入数据

2 个答案: