Python 函数中未检测到全局变量

Question

我正在做一个程序，所以当我在 tkinter 制作的界面上按下按钮时，我可以执行 selenium 脚本，但是我遇到了问题，当我运行ned 将执行 webdriver 的函数时，它告诉我运行ning 是一个局部变量，我在分配它之前调用它，尽管我将它作为一个全局变量。

from selenium import webdriver
from time import sleep
from tkinter import *

root = Tk()

running = False

def start():
    if running == False:
        running = True
        browser = webdriver.Chrome("E:\webdrivers\chromedriver")
        browser.maximize_window()
        browser.get("https://google.com")
        print("The program is running")
    else:
        print("The program is already running")

def stop():
    if running == False:
        print("The program is not running")
    else:
        running = False
        browser.quit()
        print("Program killed")

startButton = Button(root, text="Start", padx=80, pady=80, command=start, fg="#ff0066", bg="#1a1a1a")
stopButton = Button(root, text="Stop", padx=80, pady=80, command=stop, fg="#1a1a1a", bg="#ff0066")

startButton.pack()
stopButton.pack()

root.mainloop()

然后我尝试将运行ning 作为参数传递，但错误是当我使用该函数并更改值时它会在局部级别发生变化，而当我运行下一个函数时使用该变量的它具有错误的值。我想知道如何使函数将该变量识别为全局变量。谢谢大家

Answer 1

正如@formicaman 告诉我的那样，我解决了在运行之前添加全局的问题，如果有人需要它，它看起来像这样

from selenium import webdriver
from time import sleep
from tkinter import *

root = Tk()

running = False

def start():
    global running
    if running == False:
        running = True
        browser = webdriver.Chrome("E:\webdrivers\chromedriver")
        browser.maximize_window()
        browser.get("https://google.com")
        print("The program is running")
    else:
        print("The program is already running")

def stop():
    global running
    if running == False:
        print("The program is not running")
    else:
        running = False
        browser.quit()
        print("Program killed")

startButton = Button(root, text="Start", padx=80, pady=80, command=start, fg="#ff0066", bg="#1a1a1a")
stopButton = Button(root, text="Stop", padx=80, pady=80, command=stop, fg="#1a1a1a", bg="#ff0066")

startButton.pack()
stopButton.pack()

root.mainloop()

Python 函数中未检测到全局变量

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