try user input, prefill with known type, else next choice

if not encpick and self.savesAskUser:
self.update() # else dialog doesn't appear in rare cases
askuser = askstring('PyEdit', 'Enter Unicode encoding for save',
initialvalue=(self.knownEncoding or
self.savesEncoding or
sys.getdefaultencoding() or ''))
if askuser:
try:
text.encode(askuser)
encpick = askuser
except (UnicodeError, LookupError): # LookupError: bad name
pass # UnicodeError: can't encode

try config file

if not encpick and self.savesEncoding:
try:
text.encode(self.savesEncoding)
encpick = self.savesEncoding
except (UnicodeError, LookupError):
pass

try platform default (utf8 on windows)

if not encpick:
try:
text.encode(sys.getdefaultencoding())
encpick = sys.getdefaultencoding()
except (UnicodeError, LookupError):
pass

open in text mode for endlines + encoding

if not encpick:
showerror('PyEdit', 'Could not encode for file ' + filename)
else:
try:
file = open(filename, 'w', encoding=encpick)
file.write(text)
file.close()
except:
showerror('PyEdit', 'Could not write file ' + filename)
else:
self.setFileName(filename) # may be newly created
self.text.edit_modified(0) # 2.0: clear modified flag
self.knownEncoding = encpick # 2.1: keep enc for next save

don't clear undo/redo stks!

def onNew(self):
"""
start editing a new file from scratch in current window;
see onClone to pop-up a new independent edit window instead;
"""
if self.text_edit_modified(): # 2.0
if not askyesno('PyEdit', 'Text has changed: discard changes?'):
return
self.setFileName(None)

704 | Chapter 11: Complete GUI Programs