构建字典时元组索引必须是整数

Question

我正在参加 Udacity 编程课程并且已经在同一个问题上坐了一个星期了。我终于认为我接近正确了，但我没有得到最后的反对意见。这是我的代码：

def process_file(f):
    # This is example of the datastructure you should return
    # Each item in the list should be a dictionary containing all the relevant data
    # Note - year, month, and the flight data should be integers
    # You should skip the rows that contain the TOTAL data for a year
    # data = [{"courier": "FL",
    #          "airport": "ATL",
    #          "year": 2012,
    #          "month": 12,
    #          "flights": {"domestic": 100,
    #                      "international": 100}
    #         },
    #         {"courier": "..."}
    # ]
    data = []
    info = {}
    info["courier"], info["airport"] = f[:6].split("-")

    with open("{}/{}".format(datadir, f), "r") as html:     
        soup = BeautifulSoup(html)
        car = str(html)[17:19]
        airp = str(html)[20:23]
        mydict = {}
        x = 0
        table = soup.find("table", {"class": "dataTDRight"})
        rows = table.find_all('tr')

        for row in rows:
            cells = row.find_all('td')
            year = cells[0].get_text()
            year = (year.encode('ascii'))

            Month = cells[1].get_text()
            Month = (Month.encode('ascii'))
            domestic = cells[2].get_text()
            domestic = (domestic.encode('ascii'))

            international = cells[3].get_text()
            international = (international.encode('ascii'))

            if Month != "Month" and Month != "TOTAL":
                Month = int(Month)
                year = int(year)
                domestic = int(domestic.replace(',', ''))
                international = int(international.replace(',', ''))

                mydict['courier'] = car
                mydict['airport'] = airp
                mydict['year'] = year
                mydict['month'] = Month
                mydict['flights'] = (domestic, international)
                data.append(mydict.copy())
                #print type(domestic)
            #print mydict
    print data        
    return data
def test():
print "Running a simple test..."
open_zip(datadir)
files = process_all(datadir)
data = []
for f in files:
    data += process_file(f)
assert len(data) == 399
for entry in data[:3]:
    assert type(entry["year"]) == int
    assert type(entry["month"]) == int
    assert type(entry["flights"]["domestic"]) == int
    assert len(entry["airport"]) == 3
    assert len(entry["courier"]) == 2
assert data[-1]["airport"] == "ATL"
assert data[-1]["flights"] == {'international': 108289, 'domestic': 701425}

print "... success!"

我收到的错误信息是：

Traceback (most recent call last):
  File "vm_main.py", line 33, in <module>
    import main
  File "/tmp/vmuser_elbzlfkcpw/main.py", line 2, in <module>
    import studentMain
  File "/tmp/vmuser_elbzlfkcpw/studentMain.py", line 2, in <module>
    process.test()
  File "/tmp/vmuser_elbzlfkcpw/process.py", line 114, in test
    assert type(entry["flights"]["domestic"]) == int
TypeError: tuple indices must be integers, not str

我完全是初学者，我检查了domestic和international的类型，它们都是int。

任何人都可以告诉我在哪里可以查找或我做错了什么吗？

Answer 1

您在这里创建了一个元组：

mydict['flights'] = (domestic, international)

所以mydict['flights']是一个元组。但是你在这里尝试把它当作字典：

assert type(entry["flights"]["domestic"]) == int

那不行；您需要在此处使用整数索引：

assert type(entry["flights"][0]) == int

或者更好的是，使用 isinstance() 来测试类型：

assert isinstance(entry["flights"][0], int)

Answer 2

在这里，您将数据 mydict['flights'] 分配为 tuple。

def process_file(f):
    # Omitted code...
    mydict['flights'] = (domestic, international)

那么您的错误来自对该数据类型的非法访问。您正在尝试通过您在赋值中使用的变量名称访问 tuple 的第一项：

assert type(entry["flights"]["domestic"]) == int

您要么需要通过整数索引访问您的数据：

assert type(entry["flights"][0]) == int

或者您需要将作业更改为：

mydict['flights'] = {"domestic":domestic, "international":international}

tuples 是不可变数据类型，由整数索引。您尝试的访问类型是典型的 dictionary，其中索引可以是任何类型。

构建字典时元组索引必须是整数

Tuple indices must be integers when building a dictionary

python

tuples