adding get_leaderboard for crypto tournament

numerapi/cryptoapi.py

@@ -1,10 +1,49 @@
 """API for Numerai Crypto"""
 
+from typing import List, Dict
 from numerapi import base_api
+from numerapi import utils
+
 
 class CryptoAPI(base_api.Api):
     """"API for Numerai Crypto"""
 
     def __init__(self, *args, **kwargs):
         base_api.Api.__init__(self, *args, **kwargs)
         self.tournament_id = 12
+
+    def get_leaderboard(self, limit: int = 50, offset: int = 0) -> List[Dict]:
+        """Get the current Numerai Crypto leaderboard with a reduced set of fields.
+
+        Returns:
+            list of dicts: each dict contains only the requested fields:
+                - nmrStaked
+                - rank
+                - username
+                - corrRep
+                - mmcRep
+                - return_1_day
+                - return_52_weeks
+                - return_13_weeks
+        """
+        query = '''
+            query($limit: Int!
+                  $offset: Int!) {
+              cryptosignalsLeaderboard(limit: $limit
+                            offset: $offset) {
+                nmrStaked
+                rank
+                username
+                corrRep
+                mmcRep
+                return_1_day
+                return_52_weeks
+                return_13_weeks
+              }
+            }
+        '''
+        arguments = {'limit': limit, 'offset': offset}
+        data = self.raw_query(query, arguments)['data']['cryptosignalsLeaderboard']
+        for item in data:
+            utils.replace(item, "nmrStaked", utils.parse_float_string)
+        return data