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EDITING: PathBrowser.py

import os
import sys
import importlib.machinery

from idlelib.TreeWidget import TreeItem
from idlelib.ClassBrowser import ClassBrowser, ModuleBrowserTreeItem
from idlelib.PyShell import PyShellFileList

class PathBrowser(ClassBrowser):

def __init__(self, flist, _htest=False):
        """
        _htest - bool, change box location when running htest
        """
        self._htest = _htest
        self.init(flist)

def settitle(self):
        "Set window titles."
        self.top.wm_title("Path Browser")
        self.top.wm_iconname("Path Browser")

def rootnode(self):
        return PathBrowserTreeItem()

class PathBrowserTreeItem(TreeItem):

def GetText(self):
        return "sys.path"

def GetSubList(self):
        sublist = []
        for dir in sys.path:
            item = DirBrowserTreeItem(dir)
            sublist.append(item)
        return sublist

class DirBrowserTreeItem(TreeItem):

def __init__(self, dir, packages=[]):
        self.dir = dir
        self.packages = packages

def GetText(self):
        if not self.packages:
            return self.dir
        else:
            return self.packages[-1] + ": package"

def GetSubList(self):
        try:
            names = os.listdir(self.dir or os.curdir)
        except OSError:
            return []
        packages = []
        for name in names:
            file = os.path.join(self.dir, name)
            if self.ispackagedir(file):
                nn = os.path.normcase(name)
                packages.append((nn, name, file))
        packages.sort()
        sublist = []
        for nn, name, file in packages:
            item = DirBrowserTreeItem(file, self.packages + [name])
            sublist.append(item)
        for nn, name in self.listmodules(names):
            item = ModuleBrowserTreeItem(os.path.join(self.dir, name))
            sublist.append(item)
        return sublist

def ispackagedir(self, file):
        " Return true for directories that are packages."
        if not os.path.isdir(file):
            return False
        init = os.path.join(file, "__init__.py")
        return os.path.exists(init)

def listmodules(self, allnames):
        modules = {}
        suffixes = importlib.machinery.EXTENSION_SUFFIXES[:]
        suffixes += importlib.machinery.SOURCE_SUFFIXES
        suffixes += importlib.machinery.BYTECODE_SUFFIXES
        sorted = []
        for suff in suffixes:
            i = -len(suff)
            for name in allnames[:]:
                normed_name = os.path.normcase(name)
                if normed_name[i:] == suff:
                    mod_name = name[:i]
                    if mod_name not in modules:
                        modules[mod_name] = None
                        sorted.append((normed_name, name))
                        allnames.remove(name)
        sorted.sort()
        return sorted

def _path_browser(parent):  # htest #
    flist = PyShellFileList(parent)
    PathBrowser(flist, _htest=True)
    parent.mainloop()

if __name__ == "__main__":
    from unittest import main
    main('idlelib.idle_test.test_pathbrowser', verbosity=2, exit=False)

from idlelib.idle_test.htest import run
    run(_path_browser)