sublimeText3配置浏览器预览路径localhost

import sublime, sublime_plugin
import webbrowser

url_map = {
    'E:\phpStudy\WWW' : 'http://localhost',
}

class OpenBrowserCommand(sublime_plugin.TextCommand):
    def run(self,edit):
        window = sublime.active_window()
        window.run_command('save')
        url = self.view.file_name()
        flag = False
        for path, domain in url_map.items():
            if url.startswith(path):
                url = url.replace(path, domain).replace('\\', '/')
                flag = True
                break
        if not flag:
            url = 'file://' + url
        webbrowser.open_new(url)