我有从 postcodes.io 检索的邮政编码数据 - 我正在开发一些 Python 代码来将此数据读入 JSON 结构。然后，我希望仅打印此结构中的国家和地区项目。
{
"status": 200,
"result": {
"eastings": 536500,
"outcode": "SG8",
"admin_county": "Hertfordshire",
"postcode": "SG8 7XU",
"incode": "7XU",
"codes": {
"parliamentary_constituency": "E14000845",
"admin_district": "E07000099",
"parish": "E04004793",
"nuts": "UKH23",
"admin_county": "E10000015",
"ccg": "E38000026",
"admin_ward": "E05004782"
},
"parliamentary_constituency": "North East Hertfordshire",
"quality": 1,
"parish": "Royston",
"nuts": "Hertfordshire",
"european_electoral_region": "Eastern",
"latitude": 52.0578463413646,
"msoa": "North Hertfordshire 002",
"nhs_ha": "East of England",
"primary_care_trust": "Hertfordshire",
"admin_ward": "Royston Meridian",
"admin_district": "North Hertfordshire",
"country": "England",
"region": "East of England",
"longitude": -0.010476012290143,
"ccg": "NHS Cambridgeshire and Peterborough",
"lsoa": "North Hertfordshire 002D",
"northings": 241808
}
} 这是我的代码:
import sys
import json
import urllib
def main(argv):
print ("PCinfo Postcode Search")
# Check program invocation is correct
if len(argv) == 2:
searchterm = argv[1]
else:
print("Incorrect program call. Usage: PCinfo.py [POSTCODE]")
sys.exit(0)
url = 'http://api.postcodes.io/postcodes/'
print ("Calling API with URL " + url + searchterm)
try:
# For Python 3.0 and later
from urllib.request import urlopen
url = url + urllib.parse.quote(searchterm)
response = urlopen(url).readall().decode('utf-8')
print("I did 3.0 read")
except ImportError:
# Fall back to Python 2
from urllib import urlopen
url = url + urllib.quote(searchterm)
response = urlopen(url).read()
print("I did 2.0 read")
structure = json.loads(response)
print(json.dumps(structure, indent=2))
print(structure["country"])
if __name__== "__main__":
from sys import argv
main(argv)
这是程序的输出。第一个打印工作正常并显示整个 JSON 列表，但在尝试仅打印国家/地区时出现“关键错误”？花了好几个小时才看完!请帮忙!
sh-4.4$ python PCinfo7.py SG87XU
PCinfo Postcode Search
Calling API with URL http://api.postcodes.io/postcodes/SG87XU
I did 2.0 read
{
"status": 200,
"result": {
"eastings": 536500,
"outcode": "SG8",
"admin_county": "Hertfordshire",
"postcode": "SG8 7XU",
"incode": "7XU",
"codes": {
"parliamentary_constituency": "E14000845",
"admin_district": "E07000099",
"parish": "E04004793",
"nuts": "UKH23",
"admin_county": "E10000015",
"ccg": "E38000026",
"admin_ward": "E05004782"
},
"parliamentary_constituency": "North East Hertfordshire",
"quality": 1,
"parish": "Royston",
"nuts": "Hertfordshire",
"european_electoral_region": "Eastern",
"latitude": 52.0578463413646,
"msoa": "North Hertfordshire 002",
"nhs_ha": "East of England",
"primary_care_trust": "Hertfordshire",
"admin_ward": "Royston Meridian",
"admin_district": "North Hertfordshire",
"country": "England",
"region": "East of England",
"longitude": -0.010476012290143,
"ccg": "NHS Cambridgeshire and Peterborough",
"lsoa": "North Hertfordshire 002D",
"northings": 241808
}
}
Traceback (most recent call last):
File "PCinfo7.py", line 45, in <module>
main(argv)
File "PCinfo7.py", line 40, in main
print(structure["country"])
最佳答案
这是因为 country 不存在于 struct json 中。
结构有结果，而结果又包含国家/地区
使用访问它
print(structure['result']['country'])
关于python - 尝试从 JSON 列表打印元素时出现关键错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48528109/