Question

当我运行附加到CSV的此代码时，URL位于columnA [1]和在A [2]处插入名称会出现以下错误：

IndexError：列表索引超出范围

目标是通过以CSV格式提供名称来提取位置。

# importing the requests library
import requests
import csv

# api-endpoint
URL = "http://maps.googleapis.com/maps/api/geocode/json"

f = open("z1.csv")
reader = csv.DictReader(f)

for row in reader:
    print(row["URL"])

# location given here
location = row["URL"]

records = location.splitlines()
myreader = csv.reader(records)

for row in myreader:
    print('Location', row[0])

# Defining a params dict for the parameters to be sent to the API
PARAMS = {'address':location}

# Sending get request and saving the response as response object
r = requests.get(url = URL, params = PARAMS)

# Extracting data in json format
data = r.json()


# Extracting latitude, longitude and formatted address 
# of the first matching location
latitude = data['results'][0]['geometry']['location']['lat']
longitude = data['results'][0]['geometry']['location']['lng']
formatted_address = data['results'][0]['formatted_address']

# Printing the output
print("Latitude:%s\nLongitude:%s\nFormatted Address:%s"
%(latitude, longitude,formatted_address))

Answer 1

在访问第一个元素之前，您必须确保列表data['results']不为空。如果它是一个空数组，那么它将引发异常IndexError : List index Out of range

还有一条建议，您需要确保字段results中存在字段data。否则，对data["results"]的调用将引发KeyError例外。在你的测试中并非如此。但使用get函数而不是括号dict.get(key) instead of dict[key]通常是一种很好的做法。

您的代码的修复程序是：

# importing the requests library
import requests
import csv

# api-endpoint
URL = "http://maps.googleapis.com/maps/api/geocode/json"

f = open("z1.csv")
reader = csv.DictReader(f)

for row in reader:
    print(row["URL"])

# location given here
location = row["URL"]

records = location.splitlines()
myreader = csv.reader(records)

for row in myreader:
    print('Location', row[0])

# Defining a params dict for the parameters to be sent to the API
PARAMS = {'address':location}

# Sending get request and saving the response as response object
# Make sure that you had a successful request
r = requests.get(url = URL, params = PARAMS)
if r.status_code == 200:
    # Extracting data in json format
    data = r.json()


    if data.get("results", []):
        # Extracting latitude, longitude and formatted address 
        # of the first matching location
        latitude = data['results'][0]['geometry']['location']['lat']
        longitude = data['results'][0]['geometry']['location']['lng']
        formatted_address = data['results'][0]['formatted_address']

        # Printing the output
        print("Latitude:%s\nLongitude:%s\nFormatted Address:%s"
        %(latitude, longitude,formatted_address))

IndexError：列表索引超出范围

1 个答案: