modified | modified BaseStructure class to use lazy import on urandom…

… and SeCo library to resolve the dependency issue, modified HyperLogLog to do the same with redis ResponseError.

redistr/BaseStructure.py

@@ -1,7 +1,5 @@
 # Author: Hansheng Zhao <zhaohans@msu.edu> (https://www.zhs.me)
 
-from os import urandom
-
 
 class BaseStructure(object):
   """ Redis interfaces base structure """
@@ -18,7 +16,8 @@ def __init__(self, redis, token = None):
     :param redis: redis, the redis instance
     :param token: mixed, the access token
     """
-    # import SeCo serializer
+    # import urandom and SeCo
+    from os import urandom
     from seco import SeCo
     # set the default type
     self._type = b'none'

redistr/HyperLogLog.py

@@ -2,13 +2,6 @@
 
 from .BaseStructure import BaseStructure
 
-try:
-  # attempts to import redis error
-  from redis import ResponseError
-except ImportError:
-  # use general exception instead
-  ResponseError = Exception
-
 
 __all__ = ('HyperLogLog', )
 
@@ -23,6 +16,8 @@ def __init__(self, redis, token = None):
     :param redis: redis, the instance
     :param token: mixed, access token
     """
+    # import redis ResponseError
+    from redis import ResponseError
     super(HyperLogLog, self).__init__(redis, token)
     # set the default data type
     self._type = b'string'