问重现句子时的错误

EN

import json
import os.path

def InputFile():
    global compfilename
    compfilename = input("Please enter an existing compressed file to be decompressed: ")

def Validation2():
    if compfilename == (""):
        print ("Nothing was entered for the filename. Please re-enter a valid filename.")
        Error()
    if os.path.exists(compfilename + ".txt") == False:
        print ("No such file exists. Please enter a valid existing file.")
        Error()

def OutputDecompressed():
    global words
    global orgsentence
    newfile = open((compfilename)+'.txt', 'r')
    saveddata = json.load(newfile)
    orgsentence = saveddata
    words = orgsentence.split(' ')
    print ("Words in the sentence: " + str(words))

def Uniquewords():
    for i in range(len(words)):
        if words[i] not in unilist:
            unilist.append(words[i])
    print ("Unique words: " + str(unilist))

def PosText():
    global pos
    find = dict((sentence, words.index(sentence)+1) for sentence in list(words))
    pos = (list(map(lambda sentence: find [sentence], words)))
    return (pos)

def Error():
    MainCompression()

def OutputDecompressed2():
    for number in pos:
    decompression.append(orgsentence[int(number)-1])
    finalsentence = (" ".join(decompression))
    print ("Original sentence from file: " + finalsentence)

def OutputText():
    print ("The positions of the word(s) in the sentence are: " + str(pos))

def MainCompression():
    global decompression
    decompression = []
    global unilist
    unilist = []
    InputFile()
    Validation2()
    OutputDecompressed()
    Uniquewords()
    PosText()
    OutputText()
    OutputDecompressed2()

MainCompression()

Please enter an existing compressed file to be decompressed: ohdear
Words in the sentence: ['hello', 'hello', 'hello', 'hello']
Unique words: ['hello']
The positions of the word(s) in the sentence are: [1, 1, 1, 1]
Original sentence from file: h h h h