Generates set.json files from Scryfall

I should have done this in the first place instead of figuring out how
to use MTGJSON files. Scryfall structures its data a bit differently and
notably includes a list of keywords for each card.

Having these set.json files enables easier analysis of the keyword
content of each set.

scryfall_requests.py

@@ -0,0 +1,40 @@
+import requests
+import json
+import time
+
+
+# Requests card objects from each set from Scryfall.com
+# Takes a few seconds and creates a ~1 MB json file per set
+# Reads set codes on separate lines in set_codes.txt
+
+def request_set(code):
+    time.sleep(0.1)  # Scryfall asks for 50-100 ms delay between requests
+    # Scryfall query is "set:code in:booster"
+    url = f'https://api.scryfall.com/cards/search?q=set%3A{code}+in%3Dbooster'
+    print(f'Requesting {code}')
+    response = requests.get(url)
+    d = response.json()
+    cards = []
+    cards += d['data']
+    while d['has_more']:
+        time.sleep(0.1)
+        print(f'Requesting {code} next page')
+        response = requests.get(d['next_page'])
+        d = response.json()
+        cards += d['data']
+    output_cards = json.dumps(cards)
+    if code == 'CON':
+        code = 'CON_'
+    f = open(f'scryfall/sets/{code}.json', 'w+')
+    f.write(output_cards)
+    f.close()
+
+
+sets = []
+set_file = open('set_codes.txt')
+for line in set_file:
+    sets += [line.strip()]
+set_file.close()
+
+for code in sets:
+    request_set(code)