fix: pylint fixes

pyzipline/rest_adapter.py

@@ -1,6 +1,5 @@
 """This module contains the RestAdapter class, which is used to make requests to the Zipline server."""""
 import logging
-from typing import Dict
 from json import JSONDecodeError
 
 import requests

pyzipline/utils.py

@@ -1,7 +1,7 @@
 """This is a list of various utility functions used in PyZipline."""
-from datetime import datetime
+from datetime import datetime as dtime
 
-def convert_str_to_datetime(date_string: str) -> datetime:
+def convert_str_to_datetime(date_string: str) -> dtime:
     """Converts a Zipline date string to a datetime object
 
     Args:
@@ -10,9 +10,9 @@ def convert_str_to_datetime(date_string: str) -> datetime:
     Returns:
         datetime: Datetime object
     """
-    return datetime.strptime(date_string, '%Y-%m-%dT%H:%M:%S.%fZ')
+    return dtime.strptime(date_string, '%Y-%m-%dT%H:%M:%S.%fZ')
 
-def convert_datetime_to_str(datetime: datetime) -> str:
+def convert_datetime_to_str(datetime: dtime) -> str:
     """Converts a datetime object to a Zipline (`ISO 8601`) date string
 
     Args: