[英]Python: parse JSON in loop
我有一個功能,可以從數據庫中提取Country,City,Latitude,Longitude
,並在Yelp API上搜索特定業務。
一切正常:
def get_movietheaters_for(country, city, latitude, longitude):
connection2 = pyodbc.connect('DRIVER={SQL Server};'
'SERVER=ASPIRES3;'
'DATABASE=worldcitiespop;'
'UID=sqlninja;'
'PWD=sqlninja')
cursor2 = connection2.cursor()
# Call Yelp API to pull business data
# (Yelp v3 API: https://nz.yelp.com/developers/documentation/v3)
url = 'https://api.yelp.com/v3/businesses/search'
params = {'cc': country,
'location': city,
'cll': "%s,%s" % (latitude, longitude),
'categories': args.category,
'limit': args.limit}
response = requests.get(url = url, headers = headers, params=params)
# if response.status_code == 200:
response_data = response.json()
sqlStatement = "INSERT INTO VistaYelp (ID, Name, City, Zip_code, Country, State, Address1, Address2, Address3, Latitude, Longitude, Phone, Yelp_URL, Review_Count, Rating) values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)" # Query
# Here we go to store JSON elements for SQL
for SQL_element in response_data['businesses']:
SQL_ID = SQL_element['id']
SQL_Name = SQL_element['name']
SQL_City = SQL_element['location']['city']
SQL_Zip_code = SQL_element['location']['zip_code']
SQL_Country = SQL_element['location']['country']
SQL_State = SQL_element['location']['state']
SQL_Address1 = SQL_element['location']['address1']
SQL_Address2 = SQL_element['location']['address2']
SQL_Address3 = SQL_element['location']['address3']
SQL_Latitude = SQL_element['coordinates']['latitude']
SQL_Longitude = SQL_element['coordinates']['longitude']
SQL_Phone = SQL_element['phone']
SQL_YelpURL = SQL_element['url']
SQL_Review = SQL_element['review_count']
SQL_Rating = SQL_element['rating']
if args.do == 'show':
print (SQL_ID,SQL_Name,SQL_City,SQL_Zip_code,SQL_Country,SQL_State,
SQL_Address1,SQL_Address2,SQL_Address3,SQL_Latitude,SQL_Longitude,SQL_Phone)
elif args.do == 'save':
cursor2.execute(sqlStatement, SQL_ID,SQL_Name,SQL_City,SQL_Zip_code,SQL_Country,SQL_State,SQL_Address1,SQL_Address2,SQL_Address3,SQL_Latitude,SQL_Longitude,SQL_Phone,SQL_YelpURL,SQL_Review,SQL_Rating)
connection2.commit()
if args.do == 'show':
print ('\nTotal Cinemas found: ' , len(response_data['businesses']),' for Latitude and Longitude ', latitude, longitude)
elif args.do == 'save':
print ('\nTotal Cinemas found and saved in database: ' , len(response_data['businesses']),' for', latitude, longitude)
問題開始於腳本搜索不存在或不在Yelp數據庫中的城鎮時,因此JSON調用返回我:
{
"error": {
"code": "LOCATION_NOT_FOUND",
"description": "Could not execute search, try specifying a more exact location."
}
}
劇本死於可怕的痛苦(實際上是我的痛苦):
對我來說,Python在說:
for SQL_element in response_data['businesses']:
KeyError: 'businesses'
翻譯的意思是:“伙計,您知道'businesses'JSON元素,響應中沒有這樣的元素,所以我不知道該怎么做,所以我就在這里停止。”
我該如何構建這樣的結構:繼續工作, if response_data['error']['code'] == 'LOCATION_NOT_FOUND':
什么都不做?
if 'businesses' in response_data:
for SQL_element in response_data['businesses']:
…
response_data = response.json()
if response_data['error']['code'] == 'LOCATION_NOT_FOUND':
# if nothing found, print a message and terminate the function
print('No cinemas found.')
return
# otherwise keep on going
sqlStatement = "INSERT INTO ..."
response_data = response.json()
if response_data.get('error'):
return # Do nothing and return
在response_data = response.json()之后
驗證response_data
是否具有businesses
密鑰
If `businesses` in response_data.keys():
# Do the code
您可能應該嘗試捕獲該錯誤並中止該函數的進一步執行。
if "error" in response_data:
return #Function will stop on a return call
您甚至可以根據需要返回類似狀態的信息,例如
return True
return False
有關return命令的更多信息,請參見此問題 。
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