python - 为什么 tempfile 似乎在 with 语句中删除了自身？

Question

该程序是一个旨在规避代理设置的浏览器。正如您所看到的，当数据被处理时，它被放入一个文件中并在默认浏览器中打开。然而，当我在 chrome 中打开它时(我不知道这是否重要)，它说:

找不到该网页

未找到该网址的网页: file:///C:/Users/Thornton/appdata/local/temp/tmpreb9zp.html

错误代码:ERR_FILE_NOT_FOUND

这是代码:

import urllib.request
import webbrowser
import tempfile
from tkinter import *


class Browser:

    def __init__(self, master):
        global e1

        self.proxy_handler = urllib.request.ProxyHandler(proxies=None)
        self.opener = urllib.request.build_opener(self.proxy_handler)

        Label(master, text='Full Path').grid(row=0)
        e1 = Entry(master)
        e1.grid(row=0, column=1)
        Button(master, text='Go', command=self.browse).grid(row=0, column=2)
        root.bind('<Return>', self.browse)

    @staticmethod
    def parsed(data):
        initial = str(data)[2:-1]
        lines = initial.split('\\n')
        return lines

    def navigate(self, query):
        response = self.opener.open(query)
        html = self.parsed(response.read())
        return html

    def browse(self):
        raw_data = self.navigate(e1.get())
        clean_data = self.parsed(raw_data)

        with tempfile.NamedTemporaryFile(suffix='.html') as cache:
            cache.writelines(line.encode('UTF-8') for line in clean_data)
            webbrowser.open_new_tab(cache.name)

root = Tk()
root.wm_attributes('-topmost', 1)
app = Browser(root)
root.mainloop()

Answer 1

因为临时文件是 deleted when closed ，并且 with 语句正是这样做的，并且 webbrowser 模块不会等待完成。来自 documentation :

For non-Unix platforms, or when a remote browser is available on Unix, the controlling process will not wait for the user to finish with the browser