枚举元组列表时，我得到 TypeError: 'type' object has no attribute '__getitem__'

Question

下面的脚本读取一个 CSV 文件并创建一个名为 people 的元组列表。元组是patron_id（唯一的字符串标识符）和person信息的字典。

对于如下所示的数据样本（已删除名称信息进行简化）：

patron_id    show_id
1111MAIN       MW1
2222SCOTT      MW2
1111MAIN       MW1

脚本应该输出一个元组列表，如下所示：

[ ("1111MAIN", {'patron_id': "1111MAIN", 'show_list': ["MW1", "MW2"]}), ("2222SCOTT", {'patron_id': "2222SCOTT", 'show_list': ["MW2"]}) ]

脚本在回溯中引发以下错误：

File "frequency.py", line 75, in <module> main("input.csv") File "frequency.py", line 35, in main person_index = [x for x, y in enumerate[people] if y[0] == patron_id]

当我在 shell 中手动测试这一行时，它会返回我正在搜索的元组的索引。为什么这行在脚本中失败了？

import csv

def main(filename):
    people = [] #list of person tuples
    person = {} #patron info with list of unique shows

    #open csv data
    csv_file = csv.reader(open(filename, 'rb'))

    #read and define CSV data
    for record in csv_file:
        show_list = []

        patron_id = record[0]
        first_name = record[1]
        last_name = record[2]
        show_name = record[3]

        #check if this is the first row
        if len(people) == 0:
            show_list.append(show_name)
            person = (patron_id, {'patron_id': patron_id, 'first_name': first_name, 'last_name': last_name, 'show_list': show_list})
            people.append(person)

        else:

            #if this person IS in the list of people
            if any(patron_id in person for person in people) == True:
                #retrieve this person from people by finding its index          
                person_index = [x for x, y in enumerate[people] if y[0] == patron_id][0]

Answer 1

好吧，正如我的评论中所说，问题是您尝试使用方括号调用enumerate 的__getitem__ 方法，这必然会失败，因为它没有这个方法。要构造枚举对象，请使用括号。

尝试密切注意错误消息，它们通常很有帮助。我不需要阅读您的整个代码即可找到错误。

Answer 2

您需要将enumerate[people] 更改为enumerate(people)。当你使用方括号时，python 认为你试图在位置people 访问enumerate。相反，您需要调用它。