Question

我从API导入了数据，需要帮助来获取一组特定的数据。每当我尝试打印一组特定的数据并测试代码时，我都会收到KeyError消息，并想知道如何解决它。

到目前为止，我已经尝试过print（“这是公共汽车1号线目前前往“ + resp ['departures'] ['line'] ['direction']的预计出发时间），但仍然没有工作。

from urllib.request import urlopen
import json 

def askbot(bus_stop):

    if bus_stop == "CU2":
        url =  urlopen("https://transportapi.com/v3/uk/bus/stop/43001053801/live.json? [app_id]&[app_key]&group=route&nextbuses=yes")
        data = json.loads(url.read().decode())
        json_str=json.dumps(data)
        resp=json.loads(json_str)  
        which_line = input("Which bus line would you like to know? ")
        if which_line == "1":
           print("Here is the current expected departure time for bus line  1 heading to " + resp['departures']['line']['direction'])
        else:
            print("That is not a valid line!")
    else:
        print("That bus stop does not exist!")

which_stop = input("Which bus stop timetable would you like to know? ")
askbot(which_stop)

此代码当前仅在测试特定的公交车站，但是，当第二个输入输入“ 1”时，会显示一条错误消息，提示

File "c:/Users/[Name]/Desktop/[Folder]/Test 2.py", line 23, in <module>
askbot(which_stop)
  File "c:/Users/[Name]/Desktop/[Folder]/Test 2.py", line 14, in askbot
print("Here is the current expected departure time for bus line 1 heading to " + resp['departures']['line']['direction'])
KeyError: 'line'

我不确定这意味着什么，我还要指出，API会实时更新，并且信息可能会发生变化。

Answer 1

与大多数API问题一样，最好的起点通常是文档。 This is the API endpoint in question. 考虑到这一点，我们可以看到预期的响应结构。

有了您的代码，您就快到了。您需要进一步检查响应结构。 “出发地”是一种以行号为键（例如“ 1”）而不是单词“ line”的字典。请牢记这一点，将print语句更改为如下所示：

x %>% dplyr::group_by(year) %>% dplyr::summarise(number = sum(number))

我是编码新手，无法将数据导入python

1 个答案: