def deleteMailFile(self, msgnums):

run in a thread while GUI active

indexed = enumerate(self.msglist)
keepers = [msg for (ix, msg) in indexed if ix+1 not in msgnums]
allmsgs = saveMailSeparator.join([''] + keepers)
file = open(self.filename, 'w', encoding=mailconfig.fetchEncoding) # 3.0
file.write(allmsgs)
self.msglist = keepers
self.hdrlist = list(map(self.parseHeaders, self.msglist))

def onDeleteMailFileExit(self, savetitle):
self.title(savetitle)
self.fillIndex() # updates GUI: do in main thread
self.lift() # reset my title, raise my window
self.openFileBusy.decr()

def onDeleteMailFileFail(self, exc_info, savetitle):
showerror(appname, 'Error deleting "%s"\n%s\n%s' %
((self.filename,) + exc_info[:2]))
printStack(exc_info)
self.destroy() # always close my window?
self.openFileBusy.decr() # not needed if destroy

def getMessages(self, msgnums, after):
"""
used by view,save,reply,fwd: file load and delete
threads may change the msg and hdr lists, so disable
all other operations that depend on them to be safe;
this test is for self: saves also test target file;
"""
if self.openFileBusy:
errmsg = 'Cannot fetch, file is busy:\n"%s"' % self.filename
showerror(appname, errmsg)
else:
after() # mail already loaded

def getMessage(self, msgnum):
return self.msglist[msgnum-1] # full text of 1 mail

def headersMaps(self):
return self.hdrlist # email.message.Message objects

def mailSize(self, msgnum):
return len(self.msglist[msgnum-1])

def quit(self):

don't destroy during update: fillIndex next

if self.openFileBusy:
showerror(appname, 'Cannot quit during load or delete')
else:
if askyesno(appname, 'Verify Quit Window?'):

delete file from open list

del openSaveFiles[self.filename]
Toplevel.destroy(self)

1080 | Chapter 14: The PyMailGUI Client