TypeError: unhashable 'list'

Question

我正在构建一个程序，用于将列表中的每个促销代码（可能包含 ocr 错误）与另一个列表（正确的促销代码列表）中的所有促销代码进行比较

预期输出是编辑距离和与正在比较的代码距离最小的促销代码。

我的代码

import csv
from nltk.metrics import distance

with open("all_correct_promo.csv","rb") as file1:
    reader1 = csv.reader(file1)
    correctPromoList = list(reader1)
    #print correctPromoList

with open("all_extracted_promo.csv","rb") as file2:
    reader2 = csv.reader(file2)
    extractedPromoList = list(reader2)
    #print extractedPromoList

def find_min_edit(str_,list_):
    nearest_correct_promos = []
    distances = {}
    min_dist = 100 # arbitrary large assignment
    for correct_promo in list_:
        dist = distance.edit_distance(extracted,correct_promo,True) # compute Levenshtein distance
        distances[correct_promo] = dist # store each score for real promo codes
        if dist<min_dist:
            min_dist = dist # store min distance
    # extract all real promo codes with minimum Levenshtein distance
    nearest_correct_promos.append(','.join([i[0] for i in distances.items() if i[1]==min_dist])) 
    return ','.join(nearest_correct_promos) # return a comma separated string of nearest real promo codes

incorrectPromo = {}
count = 0
for extracted in extractedPromoList:
    print 'Computing %dth promo code...' % count
    incorrectPromo[extracted] =  find_min_edit(extracted,correctPromoList) # get comma separated str of real promo codes nearest to extracted
    count+=1
print incorrectPromo

预期输出

Computing 0th promo code...
Computing 1th promo code...
Computing 2th promo code...
{'abc': 'abc', 'abd': 'abx,aba,abz,abc', 'acd': 'abx,aba,abz,abc'}

但是，我的代码显示以下错误

Computing 0th promo code...

Traceback (most recent call last):

  File "correctpromo_test4.py", line 31, in <module>

    incorrectPromo[extracted] =  find_min_edit(extracted,correctPromoList) # get 
comma separated str of real promo codes nearest to extracted

 File "correctpromo_test4.py", line 20, in find_min_edit

    distances[correct_promo] = dist # store each score for real promo codes

TypeError: unhashable type: 'list'

Answer 1

您正在以列表列表的形式阅读 CSV - 函数 find_min_edit() 需要一个字符串列表作为它的第二个参数；您传递的是字符串列表的列表。

更改您读取 csv 文件的方式，将这些内容分类 -

而不是

with open("all_correct_promo.csv","rb") as file1:
    reader1 = csv.reader(file1)
    correctPromoList = list(reader1)

就用这个

with open("all_correct_promo.csv","rb") as file1:
    reader1 = csv.reader(file1)
    correctPromoList = [''.join(i) for i in reader1]
    print correctPromoList

对两个 CSV 都执行此操作，这将解决问题...

TypeError: unhashable 'list'

TypeError: unhashable 'list'

python

python-2.7

analytics

levenshtein-distance

edit-distance