structural pattern matching of a map

map_pattern_match.py

# Simplified example of how to handle throttling of requests returned from the Shopify API
import json
import time
# The web API (GraphQL API) returns a JSON string similar to this: 
content = b'{"throttleStatus":{"maximumAvailable":1000.0,"currentlyAvailable":990,"restoreRate":50.0}}'
obj = json.loads(content) # Convert it to a Python object (a map)
# Actual code to retrieve part of the object from the full JSON from the Shopify GraphQL API:
# throttleStatus = js["extensions"]["cost"]["throttleStatus"]
# Simplified:
throttleStatus = obj["throttleStatus"]
match throttleStatus:
    case {  "maximumAvailable":     maximumAvailable,
            "currentlyAvailable":   currentlyAvailable,
            "restoreRate":          restoreRate }:
        delay = (maximumAvailable - currentlyAvailable) / restoreRate
        print("sleeping:",delay,"seconds")
        time.sleep(delay)

# Can also match the whole object, so this is equivalent:
match obj:
    case { "throttleStatus" : 
            {   "maximumAvailable":     maximumAvailable,
                "currentlyAvailable":   currentlyAvailable,
                "restoreRate":          restoreRate } }:
        delay = (maximumAvailable - currentlyAvailable) / restoreRate
        print("sleeping:",delay,"seconds")
        time.sleep(delay)
    case { "errors": errors}:
        print("something went wrong", str(errors))