PythonAnywhere：尝试使用 easygui 模块时出现 Tkinter.py 错误

Posted 2023-03-13

【中文标题】PythonAnywhere：尝试使用 easygui 模块时出现 Tkinter.py 错误

【英文标题】：PythonAnywhere: Tkinter.py error when trying to use easygui module

【发布时间】：2016-03-22 00:35:28

【问题描述】：

我儿子正在尝试使用 pythonAnywhere 执行一个小程序。

import random, easygui
secret = random.randint(1,99)
guess = 0
tries = 0
easygui.msgbox ("AHOY! I'm the Dread Pirate Roberts, and I have a    secret!\n"
"It is a number from 1 to 99. I'll give ye 6 tries.")
while guess != secret and tries < 6:
    guess = easygui.integerbox ("What's yer guess, matey?")
    if not guess: break
    if guess < secret:
        easygui.msgbox (str(guess) + "is too low, ye scurvy dog!")
    elif guess > secret:
        easygui.msgbox (str(guess) + "is too high, landlubber!" )
    tries = tries + 1
if guess == secret:
    easygui.msgbox ("Avast! Ye got it! Found me secret, ye did!" )
else:
    easygui.msgbox ("No more guesses! The number was" + str(secret))

从 bash 控制台运行代码时，会抛出以下错误：

File "NumGuess.py", line 6, in <module>
    It is a number from 1 to 99. I'll give ye 6 tries.""")
  File "/home/016646/.local/lib/python2.7/site-    packages/easygui/boxes/derived_boxes.py", line 216, in msgbox
    cancel_choice=ok_button)
  File "/home/016646/.local/lib/python2.7/site-packages/easygui/boxes/base_boxes.py", line 66, in buttonbox
    boxRoot = Tk()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1767, in __init__
    self.tk = _tkinter.create(screenName, baseName, className,     interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable

按照 PythonAnywhere 论坛上的建议，使用 pip install --user easygui 安装了模块 easygui。

由于 PA 是基于 Web 的环境，我不确定是否有一些额外的细微差别。在 ssh 进入系统时，网上有一些关于此错误的建议。但是，PA 是通过 Web 登录访问的，因此可能不适用。

【参考方案1】：

Tkinter（因此，easygui）需要一个实际的屏幕来绘制。该错误告诉您它找不到屏幕。 Tkinter 根本不是为在基于 Web 的环境中运行而设计的。

更多信息请访问this pythonanywhere help page on tkinter and other gui libraries。