golden hour

/opt/alt/python37/lib64/python3.7/idlelib

File/Folder	Size	Actions
CREDITS.txt	1.82 KB
ChangeLog	55.04 KB
HISTORY.txt	10.07 KB
Icons	-
NEWS.txt	47.65 KB
NEWS2x.txt	26.54 KB
README.txt	9.37 KB
TODO.txt	8.28 KB
__init__.py	396 B
__main__.py	159 B
__pycache__	-
autocomplete.py	8.74 KB
autocomplete_w.py	19.64 KB
autoexpand.py	3.14 KB
browser.py	8.12 KB
calltip.py	6.17 KB
calltip_w.py	6.99 KB
codecontext.py	11.06 KB
colorizer.py	12.69 KB
config-extensions.def	2.21 KB
config-highlight.def	2.8 KB
config-keys.def	10.65 KB
config-main.def	3.09 KB
config.py	37.28 KB
config_key.py	14.13 KB
configdialog.py	102.07 KB
debugger.py	18.66 KB
debugger_r.py	11.86 KB
debugobj.py	3.96 KB
debugobj_r.py	1.06 KB
delegator.py	1.02 KB
dynoption.py	1.97 KB
editor.py	64.08 KB
extend.txt	3.56 KB
filelist.py	3.8 KB
format.py	15.41 KB
grep.py	7.3 KB
help.html	60.76 KB
help.py	11.46 KB
help_about.py	8.77 KB
history.py	3.95 KB
hyperparser.py	12.58 KB
idle.py	454 B
idle.pyw	570 B
idle_test	-
iomenu.py	20.15 KB
macosx.py	9.44 KB
mainmenu.py	3.83 KB
multicall.py	18.21 KB
outwin.py	5.65 KB
parenmatch.py	7.04 KB
pathbrowser.py	3.12 KB
percolator.py	3.06 KB
pyparse.py	19.48 KB
pyshell.py	55.91 KB
query.py	14.55 KB
redirector.py	6.71 KB
replace.py	9.66 KB
rpc.py	20.64 KB
run.py	19.82 KB
runscript.py	8.58 KB
scrolledlist.py	4.36 KB
search.py	5.44 KB
searchbase.py	7.36 KB
searchengine.py	7.3 KB
sidebar.py	13.27 KB
squeezer.py	12.54 KB
stackviewer.py	4.35 KB
statusbar.py	1.41 KB
textview.py	6.65 KB
tooltip.py	6.41 KB
tree.py	15.97 KB
undo.py	10.79 KB
window.py	2.55 KB
zoomheight.py	4.1 KB
zzdummy.py	961 B

Edit: filelist.py

"idlelib.filelist"

import os
from tkinter import messagebox as tkMessageBox

class FileList:

# N.B. this import overridden in PyShellFileList.
    from idlelib.editor import EditorWindow

def __init__(self, root):
        self.root = root
        self.dict = {}
        self.inversedict = {}
        self.vars = {} # For EditorWindow.getrawvar (shared Tcl variables)

def open(self, filename, action=None):
        assert filename
        filename = self.canonize(filename)
        if os.path.isdir(filename):
            # This can happen when bad filename is passed on command line:
            tkMessageBox.showerror(
                "File Error",
                "%r is a directory." % (filename,),
                master=self.root)
            return None
        key = os.path.normcase(filename)
        if key in self.dict:
            edit = self.dict[key]
            edit.top.wakeup()
            return edit
        if action:
            # Don't create window, perform 'action', e.g. open in same window
            return action(filename)
        else:
            edit = self.EditorWindow(self, filename, key)
            if edit.good_load:
                return edit
            else:
                edit._close()
                return None

def gotofileline(self, filename, lineno=None):
        edit = self.open(filename)
        if edit is not None and lineno is not None:
            edit.gotoline(lineno)

def new(self, filename=None):
        return self.EditorWindow(self, filename)

def close_all_callback(self, *args, **kwds):
        for edit in list(self.inversedict):
            reply = edit.close()
            if reply == "cancel":
                break
        return "break"

def unregister_maybe_terminate(self, edit):
        try:
            key = self.inversedict[edit]
        except KeyError:
            print("Don't know this EditorWindow object.  (close)")
            return
        if key:
            del self.dict[key]
        del self.inversedict[edit]
        if not self.inversedict:
            self.root.quit()

def filename_changed_edit(self, edit):
        edit.saved_change_hook()
        try:
            key = self.inversedict[edit]
        except KeyError:
            print("Don't know this EditorWindow object.  (rename)")
            return
        filename = edit.io.filename
        if not filename:
            if key:
                del self.dict[key]
            self.inversedict[edit] = None
            return
        filename = self.canonize(filename)
        newkey = os.path.normcase(filename)
        if newkey == key:
            return
        if newkey in self.dict:
            conflict = self.dict[newkey]
            self.inversedict[conflict] = None
            tkMessageBox.showerror(
                "Name Conflict",
                "You now have multiple edit windows open for %r" % (filename,),
                master=self.root)
        self.dict[newkey] = edit
        self.inversedict[edit] = newkey
        if key:
            try:
                del self.dict[key]
            except KeyError:
                pass

def canonize(self, filename):
        if not os.path.isabs(filename):
            try:
                pwd = os.getcwd()
            except OSError:
                pass
            else:
                filename = os.path.join(pwd, filename)
        return os.path.normpath(filename)

def _test():  # TODO check and convert to htest
    from tkinter import Tk
    from idlelib.editor import fixwordbreaks
    from idlelib.run import fix_scaling
    root = Tk()
    fix_scaling(root)
    fixwordbreaks(root)
    root.withdraw()
    flist = FileList(root)
    flist.new()
    if flist.inversedict:
        root.mainloop()

if __name__ == '__main__':
    from unittest import main
    main('idlelib.idle_test.test_filelist', verbosity=2)

#    _test()