use requests instead of curl

optlib/api.py

@@ -1,5 +1,4 @@
-from subprocess import check_output
-import json
+import requests
 import os
 
 import logging
@@ -43,10 +42,9 @@ def _get(endpoint, *args, **kwargs):
     url = "?".join([endpoint, "&".join(f"{k}={v}" for k, v in kwargs.items())])
     logger.debug("GET", url)
 
-    if (resp := json.loads(check_output(["curl", "-gs", url]))).get("error"):
-        raise API_InputError("{0}".format(resp["error"]))
-
-    return resp
+    r = requests.get(url)
+    r.raise_for_status()
+    return r.json()
 
 def get_chain(*args, **kwargs):
     """Request an option chain from TDAmeritrade's API.