TypeError例外は： 'NoneType' オブジェクトは、

Question

が、私はエラーを生成しますPythonプログラムを持っているunsubscriptableです：

def update_ranges(phonemelist) : 
    """ updating the rows and columns of the list of input phonemes""" 
    # make a copy of the list as we're going to modify it (optional) 
    phonlist = phonemelist[:] 
    # we don't need the row titles, they just complicate things 
    rowtitles, phonlist = zip(*phonlist) 
    rows = len(phonlist) 
    columns = range(len(phonlist[0])) 

    # for each row except the last 
    for i in xrange(rows - 1): 
     # update it by going down all the rows below it 
     for k in xrange(i+1, rows): 
      # for both columns 
      for j in columns: 
       update(phonlist, i, j, k, j) 

    # put the row titles back in (optional) 
    phonlist = zip(rowtitles, phonlist) 
    return phonlist 

def update(phonlist, curr_row, curr_col, next_row, next_col) : 
    """ applying co-articulation rules for comparing the ranges """ 
    curr_low, curr_high = phonlist[curr_row][curr_col] 
    next_low, next_high = phonlist[next_row][next_col] 

    # Rule 1: when one of the ranges is (-1,-1) 
    # replace the current range if it's (-1, -1) as its empty 
    if (curr_low, curr_high) == (-1, -1) : 
     phonlist[curr_row][curr_col] = next_low, next_high 
     return 
    # do nothing if the next range is (-1,-1) 
    if (next_low, next_high) == (-1, -1) : 
     return 

    # Rule 2: when ranges don't overlap 
    # replace the lowest value of current range when the next range is lower than the current range 
    elif curr_low > next_high : 
     phonlist[curr_row][curr_col] = curr_low, curr_low 
     return 
    # replace the highest values of current range when the next range is higher than the current range 
    elif next_low > curr_high : 
     phonlist[curr_row][curr_col] = curr_high, curr_high 
     return 

    # Rule 3: when ranges completely overlap 
    elif curr_low <= next_low and next_high <= curr_high or curr_low >= next_low and next_high >= curr_high : 
     # replace the values of the next range when the next range completely lies in the current range 
     if curr_high - curr_low > next_high - next_low : 
      phonlist[curr_row][curr_col] = next_low, next_high 
      return 
     # replace the values of the current range when the current range completely lies in the next range 
     else : 
      phonlist[curr_row][curr_col] = curr_low, curr_high 
      return 

    # Rule 4: when the ranges partially overlap 
    else : 
     # replace the values that is common to both ranges when next range is further ahead of the current 
     if curr_low < next_low and curr_high < next_high : 
      phonlist[curr_row][curr_col] = next_low, curr_high 
      return 
     # replace the values that is common to both ranges when current range is further ahead of the next 
     else : 
      phonlist[curr_row][curr_col] = curr_low, next_high 
      return 

エラー：

File "coarticulation.py", line 217, in update 
    next_low, next_high = phonlist[next_row][next_col] 
TypeError: 'NoneType' object is unsubscriptable 

エラーが何を意味していると私はそれをどのように修正するのですか？

Answer 1

このコード部分では問題ありません。これは、いずれか

phonlist 

又は

phonlist[next_row] 

がlist（又はsubscritableタイプ）、Noneないことを意味します。リストを作成する場所を探します。

編集：

curr_low, curr_high = phonlist[curr_row][curr_col] 
next_low, next_high = phonlist[next_row][next_col] 

エラーが2行目にあるので、私はphonlist[next_row]がNoneだと思います。

Answer 2

これは、PythonはあなたがNone値（Pythonのnull相当）からの添字（インデックス化）値にアクセスしようとすると、返すことのエラーです：

>>> a = None 
>>> a[0] 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
TypeError: 'NoneType' object is not subscriptable