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import os
import os.path
import filecmp

allfiles = {}
doublefiles = []

def scandirectory(path):
    for root,dirs,files in os.walk(path):
        for file in files:
            if os.path.splitext(file)[1] not in allfiles.keys():
                allfiles[os.path.splitext(file)[1]] = []
            allfiles[os.path.splitext(file)[1]].append([os.path.getsize(os.path.join(root, file)), os.path.join(root, file)])

def finddoublefiles():
    run_again = False
    for filetype in allfiles:
        for file in allfiles[filetype]:
            to_check_file = file
            for i in range(len(allfiles[filetype])):
                file = allfiles[filetype][i]
                if not to_check_file == file and to_check_file[0] == file[0]:
                    if filecmp.cmp(to_check_file[1], file[1]):
                        doublefiles.append(file[1])
                        allfiles[filetype].remove(file)
                        run_again = True
                        break
            if run_again:
                break
        if run_again:
            break
    if run_again:
        finddoublefiles()

def deletedoublefiles():
    for file in doublefiles:
        os.remove(file)

def resetfilelist():
    global allfiles, doublefiles
    allfiles = {}
    doublefiles = []

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import tkinter
import tkinter.filedialog as filedialog
import tkinter.messagebox as messagebox
import memorymaker
import os

window = tkinter.Tk()
window.title('Memory Maker')

tkinter.Label(window, text='Startus:').grid(row=0, column=0, sticky='e')
startuslabel = tkinter.Label(window, text='Keine Aktionen verbleibend', width=50, fg='black', bg='#00ffff', font=('bold'))
startuslabel.grid(row=0, column=1, sticky='w')
infolabel = tkinter.Label(window, text='Alles OK', width=50, fg='black', bg='green', font=('bold'))
infolabel.grid(row=0, column=1, sticky='e')
tkinter.Label(window, text='Info:').grid(row=0, column=1)

doublefile_listbox = tkinter.Listbox(window, width=157, height=47)
doublefile_listbox.grid(row=1, column=1)
scrollbar = tkinter.Scrollbar(window)
scrollbar.grid(row=1, column=2, sticky='S'+'N')
doublefile_listbox.config(yscrollcommand=scrollbar.set)
scrollbar.config(command=doublefile_listbox.yview)

def appendpath():
    path = filedialog.askdirectory()
    if path != '':
        startuslabel.config(text='Verzeichnis wird gescannt.')
        window.update_idletasks()
        memorymaker.scandirectory(path)
        startuslabel.config(text='Keine Aktionen verbleibend')
        infolabel.config(text='Es wurde noch nicht nach Doppelten Dateien Gesucht.', bg='#ffff00')

def finddoublefiles():
    startuslabel.config(text='Suche nach Doppelten Dateien.')
    window.update_idletasks()
    memorymaker.doublefiles = []      #notwendig um die listbox nicht löschen zu müssen.
    try:
        memorymaker.finddoublefiles()
        for path in memorymaker.doublefiles:
            doublefile_listbox.insert('end', path)
    except IOError:
        infolabel.config(text='Datei Zugriffs Fehler', bg='#ff0000')
    else:
        startuslabel.config(text='Keine Aktionen verbleibend')
        infolabel.config(text='Alles OK', bg='#00ff00')

def resetall():
    if messagebox.askyesno('Memory Maker', 'Alle Datei-Informationen gehen verlorren!'):
        memorymaker.resetfilelist()
        doublefile_listbox.delete(0, 'end')

def deletedoublefiles():
    if messagebox.askyesno('Memory Maker', 'Dateien wirklich löschen?'):
        try:
            for path in doublefile_listbox.get(0, 'end'):
                os.remove(path)
        except:
            infolabel.config(text='Datei Zugriffs Fehler', bg='#ff0000')
        else:
            doublefile_listbox.delete(0, 'end')         

def clearmessagelabel():
    infolabel.config(text='Alles OK', bg='#00ff00')

tkinter.Button(window, text='Entfernen',
               command=lambda doublefile_listbox=doublefile_listbox: \
               doublefile_listbox.delete(tkinter.ANCHOR)).grid(row=1, column=0, sticky='s'+'n'+'e'+'w')

menubar = tkinter.Menu(window)
filemenu = tkinter.Menu(menubar)
filemenu.add_command(label='Verzeichnis Scannen', command=appendpath)
filemenu.add_command(label='Doppelte Dateien Suchen', command=finddoublefiles)
filemenu.add_separator()
filemenu.add_command(label='Zurücksetzen', command=resetall)
filemenu.add_separator()
filemenu.add_command(label='Doppelte Dateien Löschen', command=deletedoublefiles)
filemenu.add_separator()
filemenu.add_command(label='Beenden', command=window.destroy)

menubar.add_cascade(label='Datei', menu=filemenu)
menubar.add_command(label='Nachricht gelessen', command=clearmessagelabel)
window.config(menu=menubar)

tkinter.mainloop()

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from collections import defaultdict
files = defaultdict(list)
for filename in ...:
  files[os.path.getsize(filename)].append((filename, None))

def find_duplicate(filename, filehash):
  size = os.path.getsize(filename)
  possible_duplicates = files.get(size)
  if possible_duplicates is None:
    return False
  for index, (name, hashsum) in enumerate(possible_duplicates):
    if hashsum is None:
      hashsum = calculate_file_hash(filename)
      possible_duplicates[index] = (name, hashsum)
    if hashsum == filehash:
      yield name

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with ...:
  with ....:

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with ..., ...:

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def finddoublefiles():
    run_again = False
    for filetype in allfiles:
        for to_check_file in allfiles[filetype]:
            for file in allfiles[filetype]:
                if not to_check_file == file and to_check_file[0] == file[0]:
                    if filecmp.cmp(to_check_file[1], file[1]):
                        doublefiles.append(file[1])
                        allfiles[filetype].remove(file)
                        run_again = True
                        break
            if run_again:
                break
        if run_again:
            break
    if run_again:
        finddoublefiles()