There are times that you noway but getting data from a third part library and that library has rate limit on their endpoints. For example I have recently used geopy python library to get latitude and longitude by giving city name to the function:

from geopy.geocoders import Nominatim

 city_name = 'Tehran'
 geolocator = Nominatim()
 location = geolocator.geocode(city_name)
 print location.latitude, location.longitude

This library by default sends its requests to https://nominatim.openstreetmap.org/search to get geo location data. It's rate limit is 1 request per second. To circumvent these problems and limitations use redis to cache results in your server and read cached result from your own system:

self.redis.hset(city_name, 'lat', lat)
 self.redis.hset(city_name, 'long', longitude)

Now read from cache in case it exists:

if self.redis.hexists(city_name, 'lat'):
     location = self.redis.hgetall(city_name)

Make sure to put sleep(1) when reading from Nominatim in order to by pass its limitation.


NOTE: instead of Nominatim other 3rd parties can be used.

#python #geopy #geo #latitude #longitude #Nominatim #redis #hset #geocoders