Remove boto as a dependency

Fixes:
- piskvorky#391
- piskvorky#409

Related to:
- piskvorky#413
- piskvorky#468
- piskvorky#408

setup.py

@@ -41,6 +41,7 @@ def read(fname):
     'moto[server]',
     'pathlib2',
     'responses',
+    'boto',
     'boto3',
     # Not used directly but allows boto GCE plugins to load.
     # https://github.com/GoogleCloudPlatform/compute-image-packages/issues/262
@@ -55,7 +56,7 @@ def read(fname):
     'requests',
 ]
 
-aws_deps = ['boto', 'boto3']
+aws_deps = ['boto3']
 gcp_deps = ['google-cloud-storage']
 azure_deps = ['azure-storage-blob', 'azure-common', 'azure-core']
 

smart_open/s3.py

@@ -12,7 +12,6 @@
 import logging
 import time
 
-import boto
 import boto3
 import botocore.client
 import botocore.exceptions
@@ -63,7 +62,7 @@ def parse_uri(uri_as_string):
     assert split_uri.scheme in SCHEMES
 
     port = DEFAULT_PORT
-    host = boto.config.get('s3', 'host', DEFAULT_HOST)
+    host = DEFAULT_HOST
     ordinary_calling_format = False
     #
     # These defaults tell boto3 to look for credentials elsewhere