Undefined names

[cclauss]

import curses or import weakref can solve several of these...

flake8 testing of https://github.com/bad-day/TelegramTUI on Python 3.6.3

$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./src/npyscreen/wgmultiselecttree.py:13:21: F821 undefined name 'curses'
                    curses.ascii.SP: self.h_select_toggle,
                    ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:17:34: F821 undefined name 'NPSTree'
            self._myFullValues = NPSTree.NPSTreeData()
                                 ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:18:35: F821 undefined name 'NPSTree'
        elif not isinstance(tree, NPSTree.NPSTreeData):
                                  ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:102:27: F821 undefined name 'weakref'
            self.value = [weakref.proxy(self.values[self.cursor_line]),]
                          ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:111:27: F821 undefined name 'weakref'
            self.value = [weakref.proxy(self.values[self.cursor_line]),]
                          ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:126:13: F821 undefined name 'curses'
            curses.beep()
            ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:142:34: F821 undefined name 'NPSTree'
            self._myFullValues = NPSTree.NPSTreeData()
                                 ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:143:35: F821 undefined name 'NPSTree'
        elif not isinstance(tree, NPSTree.NPSTreeData):
                                  ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:146:37: F821 undefined name 'NPSTree'
            if not isinstance(tree, NPSTree.NPSTreeData):
                                    ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:162:37: F821 undefined name 'weakref'
            if self._cached_tree is weakref.proxy(self._myFullValues) and \
                                    ^
./src/npyscreen/compatibility_code/oldtreeclasses.py:167:29: F821 undefined name 'weakref'
        self._cached_tree = weakref.proxy(self._myFullValues)
                            ^
11    F821 undefined name 'NPSTree'

[vtr0n]

Thanks! Npyscreen library really contains many bugs.

[vtr0n]

So, I fixed

[cclauss]

Proof of fix: https://travis-ci.org/bad-day/TelegramTUI. Nice work!