use python3.6+ constructs

docker/api/build.py

@@ -12,7 +12,7 @@
 log = logging.getLogger(__name__)
 
 
-class BuildApiMixin(object):
+class BuildApiMixin:
     def build(self, path=None, tag=None, quiet=False, fileobj=None,
               nocache=False, rm=False, timeout=None,
               custom_context=False, encoding=None, pull=False,
@@ -132,7 +132,7 @@ def build(self, path=None, tag=None, quiet=False, fileobj=None,
         for key in container_limits.keys():
             if key not in constants.CONTAINER_LIMITS_KEYS:
                 raise errors.DockerException(
-                    'Invalid container_limits key {0}'.format(key)
+                    f'Invalid container_limits key {key}'
                 )
 
         if custom_context:
@@ -150,7 +150,7 @@ def build(self, path=None, tag=None, quiet=False, fileobj=None,
             dockerignore = os.path.join(path, '.dockerignore')
             exclude = None
             if os.path.exists(dockerignore):
-                with open(dockerignore, 'r') as f:
+                with open(dockerignore) as f:
                     exclude = list(filter(
                         lambda x: x != '' and x[0] != '#',
                         [l.strip() for l in f.read().splitlines()]
@@ -313,7 +313,7 @@ def _set_auth_headers(self, headers):
                 auth_data[auth.INDEX_URL] = auth_data.get(auth.INDEX_NAME, {})
 
             log.debug(
-                'Sending auth config ({0})'.format(
+                'Sending auth config ({})'.format(
                     ', '.join(repr(k) for k in auth_data.keys())
                 )
             )
@@ -344,9 +344,9 @@ def process_dockerfile(dockerfile, path):
     if (os.path.splitdrive(path)[0] != os.path.splitdrive(abs_dockerfile)[0] or
             os.path.relpath(abs_dockerfile, path).startswith('..')):
         # Dockerfile not in context - read data to insert into tar later
-        with open(abs_dockerfile, 'r') as df:
+        with open(abs_dockerfile) as df:
             return (
-                '.dockerfile.{0:x}'.format(random.getrandbits(160)),
+                f'.dockerfile.{random.getrandbits(160):x}',
                 df.read()
             )
 

docker/api/client.py

@@ -107,7 +107,7 @@ def __init__(self, base_url=None, version=None,
                  user_agent=DEFAULT_USER_AGENT, num_pools=None,
                  credstore_env=None, use_ssh_client=False,
                  max_pool_size=DEFAULT_MAX_POOL_SIZE):
-        super(APIClient, self).__init__()
+        super().__init__()
 
         if tls and not base_url:
             raise TLSParameterError(
@@ -199,7 +199,7 @@ def __init__(self, base_url=None, version=None,
             self._version = version
         if not isinstance(self._version, str):
             raise DockerException(
-                'Version parameter must be a string or None. Found {0}'.format(
+                'Version parameter must be a string or None. Found {}'.format(
                     type(version).__name__
                 )
             )
@@ -219,7 +219,7 @@ def _retrieve_server_version(self):
             )
         except Exception as e:
             raise DockerException(
-                'Error while fetching server API version: {0}'.format(e)
+                f'Error while fetching server API version: {e}'
             )
 
     def _set_request_timeout(self, kwargs):
@@ -248,19 +248,19 @@ def _url(self, pathfmt, *args, **kwargs):
         for arg in args:
             if not isinstance(arg, str):
                 raise ValueError(
-                    'Expected a string but found {0} ({1}) '
+                    'Expected a string but found {} ({}) '
                     'instead'.format(arg, type(arg))
                 )
 
         quote_f = partial(urllib.parse.quote, safe="/:")
         args = map(quote_f, args)
 
         if kwargs.get('versioned_api', True):
-            return '{0}/v{1}{2}'.format(
+            return '{}/v{}{}'.format(
                 self.base_url, self._version, pathfmt.format(*args)
             )
         else:
-            return '{0}{1}'.format(self.base_url, pathfmt.format(*args))
+            return f'{self.base_url}{pathfmt.format(*args)}'
 
     def _raise_for_status(self, response):
         """Raises stored :class:`APIError`, if one occurred."""
@@ -341,8 +341,7 @@ def _stream_helper(self, response, decode=False):
 
         if response.raw._fp.chunked:
             if decode:
-                for chunk in json_stream(self._stream_helper(response, False)):
-                    yield chunk
+                yield from json_stream(self._stream_helper(response, False))
             else:
                 reader = response.raw
                 while not reader.closed:
@@ -398,8 +397,7 @@ def _multiplexed_response_stream_helper(self, response):
     def _stream_raw_result(self, response, chunk_size=1, decode=True):
         ''' Stream result for TTY-enabled container and raw binary data'''
         self._raise_for_status(response)
-        for out in response.iter_content(chunk_size, decode):
-            yield out
+        yield from response.iter_content(chunk_size, decode)
 
     def _read_from_socket(self, response, stream, tty=True, demux=False):
         socket = self._get_raw_response_socket(response)
@@ -477,7 +475,7 @@ def _unmount(self, *args):
 
     def get_adapter(self, url):
         try:
-            return super(APIClient, self).get_adapter(url)
+            return super().get_adapter(url)
         except requests.exceptions.InvalidSchema as e:
             if self._custom_adapter:
                 return self._custom_adapter

docker/api/config.py

@@ -1,11 +1,9 @@
 import base64
 
-import six
-
 from .. import utils
 
 
-class ConfigApiMixin(object):
+class ConfigApiMixin:
     @utils.minimum_version('1.30')
     def create_config(self, name, data, labels=None):
         """
@@ -22,8 +20,7 @@ def create_config(self, name, data, labels=None):
             data = data.encode('utf-8')
 
         data = base64.b64encode(data)
-        if six.PY3:
-            data = data.decode('ascii')
+        data = data.decode('ascii')
         body = {
             'Data': data,
             'Name': name,

docker/api/container.py

@@ -1,7 +1,5 @@
 from datetime import datetime
 
-import six
-
 from .. import errors
 from .. import utils
 from ..constants import DEFAULT_DATA_CHUNK_SIZE
@@ -12,7 +10,7 @@
 from ..types import NetworkingConfig
 
 
-class ContainerApiMixin(object):
+class ContainerApiMixin:
     @utils.check_resource('container')
     def attach(self, container, stdout=True, stderr=True,
                stream=False, logs=False, demux=False):
@@ -408,7 +406,7 @@ def create_container(self, image, command=None, hostname=None, user=None,
             :py:class:`docker.errors.APIError`
                 If the server returns an error.
         """
-        if isinstance(volumes, six.string_types):
+        if isinstance(volumes, str):
             volumes = [volumes, ]
 
         if isinstance(environment, dict):
@@ -790,7 +788,7 @@ def kill(self, container, signal=None):
         url = self._url("/containers/{0}/kill", container)
         params = {}
         if signal is not None:
-            if not isinstance(signal, six.string_types):
+            if not isinstance(signal, str):
                 signal = int(signal)
             params['signal'] = signal
         res = self._post(url, params=params)

docker/api/daemon.py

@@ -4,7 +4,7 @@
 from .. import auth, types, utils
 
 
-class DaemonApiMixin(object):
+class DaemonApiMixin:
     @utils.minimum_version('1.25')
     def df(self):
         """

docker/api/exec_api.py

@@ -1,10 +1,8 @@
-import six
-
 from .. import errors
 from .. import utils
 
 
-class ExecApiMixin(object):
+class ExecApiMixin:
     @utils.check_resource('container')
     def exec_create(self, container, cmd, stdout=True, stderr=True,
                     stdin=False, tty=False, privileged=False, user='',
@@ -45,7 +43,7 @@ def exec_create(self, container, cmd, stdout=True, stderr=True,
                 'Setting environment for exec is not supported in API < 1.25'
             )
 
-        if isinstance(cmd, six.string_types):
+        if isinstance(cmd, str):
             cmd = utils.split_command(cmd)
 
         if isinstance(environment, dict):

docker/api/image.py

@@ -1,15 +1,13 @@
 import logging
 import os
 
-import six
-
 from .. import auth, errors, utils
 from ..constants import DEFAULT_DATA_CHUNK_SIZE
 
 log = logging.getLogger(__name__)
 
 
-class ImageApiMixin(object):
+class ImageApiMixin:
 
     @utils.check_resource('image')
     def get_image(self, image, chunk_size=DEFAULT_DATA_CHUNK_SIZE):
@@ -130,7 +128,7 @@ def import_image(self, src=None, repository=None, tag=None, image=None,
 
         params = _import_image_params(
             repository, tag, image,
-            src=(src if isinstance(src, six.string_types) else None),
+            src=(src if isinstance(src, str) else None),
             changes=changes
         )
         headers = {'Content-Type': 'application/tar'}
@@ -139,7 +137,7 @@ def import_image(self, src=None, repository=None, tag=None, image=None,
             return self._result(
                 self._post(u, data=None, params=params)
             )
-        elif isinstance(src, six.string_types):  # from file path
+        elif isinstance(src, str):  # from file path
             with open(src, 'rb') as f:
                 return self._result(
                     self._post(
@@ -571,7 +569,7 @@ def tag(self, image, repository, tag=None, force=False):
 def is_file(src):
     try:
         return (
-            isinstance(src, six.string_types) and
+            isinstance(src, str) and
             os.path.isfile(src)
         )
     except TypeError:  # a data string will make isfile() raise a TypeError

docker/api/network.py

@@ -4,7 +4,7 @@
 from .. import utils
 
 
-class NetworkApiMixin(object):
+class NetworkApiMixin:
     def networks(self, names=None, ids=None, filters=None):
         """
         List networks. Similar to the ``docker network ls`` command.

docker/api/plugin.py

@@ -1,9 +1,7 @@
-import six
-
 from .. import auth, utils
 
 
-class PluginApiMixin(object):
+class PluginApiMixin:
     @utils.minimum_version('1.25')
     @utils.check_resource('name')
     def configure_plugin(self, name, options):
@@ -21,7 +19,7 @@ def configure_plugin(self, name, options):
         url = self._url('/plugins/{0}/set', name)
         data = options
         if isinstance(data, dict):
-            data = ['{0}={1}'.format(k, v) for k, v in six.iteritems(data)]
+            data = [f'{k}={v}' for k, v in data.items()]
         res = self._post_json(url, data=data)
         self._raise_for_status(res)
         return True

docker/api/secret.py

@@ -1,12 +1,10 @@
 import base64
 
-import six
-
 from .. import errors
 from .. import utils
 
 
-class SecretApiMixin(object):
+class SecretApiMixin:
     @utils.minimum_version('1.25')
     def create_secret(self, name, data, labels=None, driver=None):
         """
@@ -25,8 +23,7 @@ def create_secret(self, name, data, labels=None, driver=None):
             data = data.encode('utf-8')
 
         data = base64.b64encode(data)
-        if six.PY3:
-            data = data.decode('ascii')
+        data = data.decode('ascii')
         body = {
             'Data': data,
             'Name': name,

docker/api/service.py

@@ -45,7 +45,7 @@ def raise_version_error(param, min_version):
     if task_template is not None:
         if 'ForceUpdate' in task_template and utils.version_lt(
                 version, '1.25'):
-                raise_version_error('force_update', '1.25')
+            raise_version_error('force_update', '1.25')
 
         if task_template.get('Placement'):
             if utils.version_lt(version, '1.30'):
@@ -113,7 +113,7 @@ def _merge_task_template(current, override):
     return merged
 
 
-class ServiceApiMixin(object):
+class ServiceApiMixin:
     @utils.minimum_version('1.24')
     def create_service(
             self, task_template, name=None, labels=None, mode=None,

docker/api/swarm.py

@@ -1,5 +1,5 @@
 import logging
-from six.moves import http_client
+import http.client as http_client
 from ..constants import DEFAULT_SWARM_ADDR_POOL, DEFAULT_SWARM_SUBNET_SIZE
 from .. import errors
 from .. import types
@@ -8,7 +8,7 @@
 log = logging.getLogger(__name__)
 
 
-class SwarmApiMixin(object):
+class SwarmApiMixin:
 
     def create_swarm_spec(self, *args, **kwargs):
         """

docker/api/volume.py

@@ -2,7 +2,7 @@
 from .. import utils
 
 
-class VolumeApiMixin(object):
+class VolumeApiMixin:
     def volumes(self, filters=None):
         """
         List volumes currently registered by the docker daemon. Similar to the