Type declarations never hurt anybody

lib/nexrad/s3.py

@@ -25,6 +25,9 @@ def key_matches(key: str,
     return date >= start and date <= end
 
 class S3Bucket():
+    name:  str
+    cache: dict
+
     def __init__(self, s3, name: str=S3_BUCKET):
         self.s3    = s3
         self.name  = name