嗨,我收到此代码未定义StringVar()的错误,这可能是一件小事,但我对tkinter并不了解,希望获得一些帮助,谢谢.

这是我的代码：

import tkinter as tk


class Converter1(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.entry = tk.Entry(self)
        self.variable = StringVar()
        self.variable.set("Miles to Kilometers") # default dropdown menu value
        self.menu = tk.OptionMenu(self, variable, "Miles to Kilometers", "Kilometers to Miles")
        self.button = tk.Button(self, text="Convert!", command=self.convertMK)
        self.button.pack()
        self.menu.pack()
        self.button.pack()
        self.entry.pack()

    def convtertMK(self): # converts the miles and kilometers using the dropdown menu
        if var.get() == "Miles to Kilometers":
            print(int(self.entry.get()) * 1.6093)
        else:
            print(int(self.entry.get()) / 1.6093)        



converter = Converter1()

这是错误：

Traceback (most recent call last):
  File "/Users/MaxBookPro/Desktop/test.py", line 25, in <module>
    converter = Converter1()
  File "/Users/MaxBookPro/Desktop/test.py", line 8, in __init__
    self.variable = Variable1
NameError: global name 'Variable1' is not defined

再次感谢.

解决方法:

您需要指定tk.StringVar(),就像您对指定的其他所有tk函数一样.

self.variable = tk.StringVar()

这是因为您刚刚导入了tk.或者,您可以通过以下两行之一导入所需的功能,甚至全部导入：

from tk import StringVar
from tk import *