Use [a, b, *c] instead of [a, b] + c when building listbschubert/more-pythonic-list-concat

This pattern is available from python3.5 and provides a simpler
understanding of what is going on

18 files changed, 37 insertions, 34 deletions

diff --git a/buildstream/_gitsourcebase.py b/buildstream/_gitsourcebase.py
index b986f7543..c0913409c 100644
--- a/buildstream/_gitsourcebase.py
+++ b/buildstream/_gitsourcebase.py
@@ -171,7 +171,7 @@ class GitMirror(SourceFetcher):
         tags = set()
         for options in [[], ['--first-parent'], ['--tags'], ['--tags', '--first-parent']]:
             exit_code, output = self.source.check_output(
-                [self.source.host_git, 'describe', '--abbrev=0', ref] + options,
+                [self.source.host_git, 'describe', '--abbrev=0', ref, *options],
                 cwd=self.mirror)
             if exit_code == 0:
                 tag = output.strip()
diff --git a/buildstream/plugins/sources/bzr.py b/buildstream/plugins/sources/bzr.py
index de5dbdcc7..e59986da6 100644
--- a/buildstream/plugins/sources/bzr.py
+++ b/buildstream/plugins/sources/bzr.py
@@ -67,7 +67,7 @@ class BzrSource(Source):
     # pylint: disable=attribute-defined-outside-init
 
     def configure(self, node):
-        self.node_validate(node, ['url', 'track', 'ref'] + Source.COMMON_CONFIG_KEYS)
+        self.node_validate(node, ['url', 'track', 'ref', *Source.COMMON_CONFIG_KEYS])
 
         self.original_url = self.node_get_member(node, str, 'url')
         self.tracking = self.node_get_member(node, str, 'track')
diff --git a/buildstream/plugins/sources/local.py b/buildstream/plugins/sources/local.py
index bdda91e2f..50df85427 100644
--- a/buildstream/plugins/sources/local.py
+++ b/buildstream/plugins/sources/local.py
@@ -52,7 +52,7 @@ class LocalSource(Source):
         self.__unique_key = None
 
     def configure(self, node):
-        self.node_validate(node, ['path'] + Source.COMMON_CONFIG_KEYS)
+        self.node_validate(node, ['path', *Source.COMMON_CONFIG_KEYS])
         self.path = self.node_get_project_path(node, 'path')
         self.fullpath = os.path.join(self.get_project_directory(), self.path)
 
diff --git a/buildstream/plugins/sources/ostree.py b/buildstream/plugins/sources/ostree.py
index 770cfd55f..23115090f 100644
--- a/buildstream/plugins/sources/ostree.py
+++ b/buildstream/plugins/sources/ostree.py
@@ -64,7 +64,7 @@ class OSTreeSource(Source):
 
     def configure(self, node):
 
-        self.node_validate(node, ['url', 'ref', 'track', 'gpg-key'] + Source.COMMON_CONFIG_KEYS)
+        self.node_validate(node, ['url', 'ref', 'track', 'gpg-key', *Source.COMMON_CONFIG_KEYS])
 
         self.original_url = self.node_get_member(node, str, 'url')
         self.url = self.translate_url(self.original_url)
diff --git a/buildstream/plugins/sources/pip.py b/buildstream/plugins/sources/pip.py
index abef1fd0d..9d6c40d74 100644
--- a/buildstream/plugins/sources/pip.py
+++ b/buildstream/plugins/sources/pip.py
@@ -182,10 +182,12 @@ class PipSource(Source):
             packages = self.ref.strip().split('\n')
             package_dir = os.path.join(tmpdir, 'packages')
             os.makedirs(package_dir)
-            self.call(self.host_pip + ['download',
-                                       '--no-binary', ':all:',
-                                       '--index-url', self.index_url,
-                                       '--dest', package_dir] + packages,
+            self.call([*self.host_pip,
+                       'download',
+                       '--no-binary', ':all:',
+                       '--index-url', self.index_url,
+                       '--dest', package_dir,
+                       *packages],
                       fail="Failed to install python packages: {}".format(packages))
 
             # If the mirror directory already exists, assume that some other
diff --git a/buildstream/plugintestutils/runcli.py b/buildstream/plugintestutils/runcli.py
index 79d42ec1f..5dbecdd60 100644
--- a/buildstream/plugintestutils/runcli.py
+++ b/buildstream/plugintestutils/runcli.py
@@ -433,7 +433,8 @@ class Cli():
             'show',
             '--deps', deps,
             '--format', '%{name}||%{state}',
-        ] + targets)
+            *targets
+        ])
         result.assert_success()
         lines = result.output.splitlines()
         states = {}
diff --git a/buildstream/sandbox/_sandboxremote.py b/buildstream/sandbox/_sandboxremote.py
index 81702743a..38fc170f4 100644
--- a/buildstream/sandbox/_sandboxremote.py
+++ b/buildstream/sandbox/_sandboxremote.py
@@ -123,7 +123,7 @@ class SandboxRemote(Sandbox):
 
         service_keys = ['execution-service', 'storage-service', 'action-cache-service']
 
-        _yaml.node_validate(remote_config, ['url'] + service_keys)
+        _yaml.node_validate(remote_config, ['url', *service_keys])
 
         exec_config = require_node(remote_config, 'execution-service')
         storage_config = require_node(remote_config, 'storage-service')
@@ -131,10 +131,10 @@ class SandboxRemote(Sandbox):
 
         tls_keys = ['client-key', 'client-cert', 'server-cert']
 
-        _yaml.node_validate(exec_config, ['url', 'instance-name'] + tls_keys)
-        _yaml.node_validate(storage_config, ['url', 'instance-name'] + tls_keys)
+        _yaml.node_validate(exec_config, ['url', 'instance-name', *tls_keys])
+        _yaml.node_validate(storage_config, ['url', 'instance-name', *tls_keys])
         if action_config:
-            _yaml.node_validate(action_config, ['url', 'instance-name'] + tls_keys)
+            _yaml.node_validate(action_config, ['url', 'instance-name', *tls_keys])
 
         # Maintain some backwards compatibility with older configs, in which
         # 'url' was the only valid key for remote-execution:
diff --git a/tests/frontend/buildcheckout.py b/tests/frontend/buildcheckout.py
index e7f67fa91..af34e6d67 100644
--- a/tests/frontend/buildcheckout.py
+++ b/tests/frontend/buildcheckout.py
@@ -21,7 +21,7 @@ DATA_DIR = os.path.join(
 
 def strict_args(args, strict):
     if strict != "strict":
-        return ['--no-strict'] + args
+        return ['--no-strict', *args]
     return args
 
 
diff --git a/tests/frontend/logging.py b/tests/frontend/logging.py
index 17d925cd1..58ac4eeba 100644
--- a/tests/frontend/logging.py
+++ b/tests/frontend/logging.py
@@ -101,7 +101,7 @@ def test_failed_build_listing(cli, tmpdir, datafiles):
         }
         _yaml.dump(element, os.path.join(project, element_path))
         element_names.append(element_name)
-    result = cli.run(project=project, args=['--on-error=continue', 'build'] + element_names)
+    result = cli.run(project=project, args=['--on-error=continue', 'build', *element_names])
     result.assert_main_error(ErrorDomain.STREAM, None)
 
     failure_heading_pos = re.search(r'^Failure Summary$', result.stderr, re.MULTILINE).start()
diff --git a/tests/frontend/rebuild.py b/tests/frontend/rebuild.py
index 6a46e855e..21f21fae3 100644
--- a/tests/frontend/rebuild.py
+++ b/tests/frontend/rebuild.py
@@ -11,7 +11,7 @@ DATA_DIR = os.path.join(
 
 def strict_args(args, strict):
     if strict != "strict":
-        return ['--no-strict'] + args
+        return ['--no-strict', *args]
     return args
 
 
diff --git a/tests/frontend/show.py b/tests/frontend/show.py
index ac1edebd6..73cda9108 100644
--- a/tests/frontend/show.py
+++ b/tests/frontend/show.py
@@ -181,7 +181,7 @@ def test_parallel_order(cli, tmpdir, datafiles):
     elements = ['multiple_targets/order/0.bst',
                 'multiple_targets/order/1.bst']
 
-    args = ['show', '-d', 'plan', '-f', '%{name}'] + elements
+    args = ['show', '-d', 'plan', '-f', '%{name}', *elements]
     result = cli.run(project=project, args=args)
 
     result.assert_success()
@@ -210,7 +210,7 @@ def test_target_is_dependency(cli, tmpdir, datafiles):
     elements = ['multiple_targets/dependency/zebry.bst',
                 'multiple_targets/dependency/horsey.bst']
 
-    args = ['show', '-d', 'plan', '-f', '%{name}'] + elements
+    args = ['show', '-d', 'plan', '-f', '%{name}', *elements]
     result = cli.run(project=project, args=args)
 
     result.assert_success()
diff --git a/tests/frontend/source_checkout.py b/tests/frontend/source_checkout.py
index b41d32491..1a83ba76e 100644
--- a/tests/frontend/source_checkout.py
+++ b/tests/frontend/source_checkout.py
@@ -50,7 +50,7 @@ def test_source_checkout(datafiles, cli, tmpdir_factory, with_workspace, guess_e
     else:
         ws_cmd = []
 
-    args = ws_cmd + ['source', 'checkout', '--deps', 'none'] + elm_cmd + [checkout]
+    args = ws_cmd + ['source', 'checkout', '--deps', 'none', *elm_cmd, checkout]
     result = cli.run(project=project, args=args)
     result.assert_success()
 
diff --git a/tests/frontend/workspace.py b/tests/frontend/workspace.py
index 91004b9f4..7ca8064b8 100644
--- a/tests/frontend/workspace.py
+++ b/tests/frontend/workspace.py
@@ -657,14 +657,14 @@ def test_build(cli, tmpdir_factory, datafiles, kind, strict, from_workspace, gue
     # Build modified workspace
     assert cli.get_element_state(project, element_name) == 'buildable'
     assert cli.get_element_key(project, element_name) == "{:?<64}".format('')
-    result = cli.run(project=project, args=args_dir + ['build'] + args_elm)
+    result = cli.run(project=project, args=args_dir + ['build', *args_elm])
     result.assert_success()
     assert cli.get_element_state(project, element_name) == 'cached'
     assert cli.get_element_key(project, element_name) != "{:?<64}".format('')
 
     # Checkout the result
     result = cli.run(project=project,
-                     args=args_dir + ['artifact', 'checkout', '--directory', checkout] + args_elm)
+                     args=args_dir + ['artifact', 'checkout', '--directory', checkout, *args_elm])
     result.assert_success()
 
     # Check that the pony.conf from the modified workspace exists
@@ -1101,7 +1101,7 @@ def test_external_fetch(cli, datafiles, tmpdir_factory, subdir, guess_element):
     assert cli.get_element_state(str(datafiles), depend_element) == 'fetch needed'
 
     # Fetch the workspaced element
-    result = cli.run(project=project, args=['-C', call_dir, 'source', 'fetch'] + arg_elm)
+    result = cli.run(project=project, args=['-C', call_dir, 'source', 'fetch', *arg_elm])
     result.assert_success()
 
     # Assert that the depended element has now been fetched
@@ -1124,10 +1124,10 @@ def test_external_push_pull(cli, datafiles, tmpdir_factory, guess_element):
             'artifacts': {'url': share.repo, 'push': True}
         })
 
-        result = cli.run(project=project, args=['-C', workspace, 'artifact', 'push'] + arg_elm)
+        result = cli.run(project=project, args=['-C', workspace, 'artifact', 'push', *arg_elm])
         result.assert_success()
 
-        result = cli.run(project=project, args=['-C', workspace, 'artifact', 'pull', '--deps', 'all'] + arg_elm)
+        result = cli.run(project=project, args=['-C', workspace, 'artifact', 'pull', '--deps', 'all', *arg_elm])
         result.assert_success()
 
 
@@ -1145,7 +1145,7 @@ def test_external_track(cli, datafiles, tmpdir_factory, guess_element):
     del element_contents['sources'][0]['ref']
     _yaml.dump(_yaml.node_sanitize(element_contents), element_file)
 
-    result = cli.run(project=project, args=['-C', workspace, 'source', 'track'] + arg_elm)
+    result = cli.run(project=project, args=['-C', workspace, 'source', 'track', *arg_elm])
     result.assert_success()
 
     # Element is tracked now
@@ -1198,7 +1198,7 @@ def test_external_close_self(cli, datafiles, tmpdir_factory, guess_element):
     beta_element, _, beta_workspace = open_workspace(cli, tmpdir2, datafiles, "git", False, suffix="-beta")
     arg_elm = [alpha_element] if not guess_element else []
 
-    result = cli.run(project=project, args=['-C', alpha_workspace, 'workspace', 'close'] + arg_elm)
+    result = cli.run(project=project, args=['-C', alpha_workspace, 'workspace', 'close', *arg_elm])
     result.assert_success()
     assert 'you can no longer run BuildStream' in result.stderr
 
@@ -1222,7 +1222,7 @@ def test_external_reset_self(cli, datafiles, tmpdir, guess_element):
     arg_elm = [element] if not guess_element else []
 
     # Command succeeds
-    result = cli.run(project=project, args=['-C', workspace, 'workspace', 'reset'] + arg_elm)
+    result = cli.run(project=project, args=['-C', workspace, 'workspace', 'reset', *arg_elm])
     result.assert_success()
 
     # Successive commands still work (i.e. .bstproject.yaml hasn't been deleted)
diff --git a/tests/integration/shell.py b/tests/integration/shell.py
index 97c4d0cad..c4fb4e961 100644
--- a/tests/integration/shell.py
+++ b/tests/integration/shell.py
@@ -40,7 +40,7 @@ def execute_shell(cli, project, command, *, config=None, mount=None, element='ba
     if mount is not None:
         host_path, target_path = mount
         args += ['--mount', host_path, target_path]
-    args += [element, '--'] + command
+    args += [element, '--', *command]
 
     return cli.run(project=project, project_config=config, args=args)
 
diff --git a/tests/integration/source-determinism.py b/tests/integration/source-determinism.py
index 0b69346cd..8ab11615a 100644
--- a/tests/integration/source-determinism.py
+++ b/tests/integration/source-determinism.py
@@ -29,7 +29,7 @@ def create_test_directory(*path, mode=0o644):
 
 @pytest.mark.integration
 @pytest.mark.datafiles(DATA_DIR)
-@pytest.mark.parametrize("kind", [(kind) for kind in ALL_REPO_KINDS] + ['local'])
+@pytest.mark.parametrize("kind", ['local', *ALL_REPO_KINDS])
 @pytest.mark.skipif(not HAVE_SANDBOX, reason='Only available with a functioning sandbox')
 def test_deterministic_source_umask(cli, tmpdir, datafiles, kind):
     project = str(datafiles)
diff --git a/tests/sources/git.py b/tests/sources/git.py
index f3d2e2809..98891a9af 100644
--- a/tests/sources/git.py
+++ b/tests/sources/git.py
@@ -869,11 +869,11 @@ def test_git_describe(cli, tmpdir, datafiles, ref_storage, tag_type):
         options = []
     else:
         options = ['--tags']
-    describe = subprocess.check_output(['git', 'describe'] + options,
+    describe = subprocess.check_output(['git', 'describe', *options],
                                        cwd=checkout).decode('ascii')
     assert describe.startswith('tag2-2-')
 
-    describe_fp = subprocess.check_output(['git', 'describe', '--first-parent'] + options,
+    describe_fp = subprocess.check_output(['git', 'describe', '--first-parent', *options],
                                           cwd=checkout).decode('ascii')
     assert describe_fp.startswith('tag1-2-')
 
@@ -979,7 +979,7 @@ def test_git_describe_head_is_tagged(cli, tmpdir, datafiles, ref_storage, tag_ty
         options = []
     else:
         options = ['--tags']
-    describe = subprocess.check_output(['git', 'describe'] + options,
+    describe = subprocess.check_output(['git', 'describe', *options],
                                        cwd=checkout).decode('ascii')
     assert describe.startswith('tag')
 
diff --git a/tests/sources/previous_source_access/plugins/sources/foo_transform.py b/tests/sources/previous_source_access/plugins/sources/foo_transform.py
index 7101bfd24..820946454 100644
--- a/tests/sources/previous_source_access/plugins/sources/foo_transform.py
+++ b/tests/sources/previous_source_access/plugins/sources/foo_transform.py
@@ -30,7 +30,7 @@ class FooTransformSource(Source):
         return path
 
     def configure(self, node):
-        self.node_validate(node, ['ref'] + Source.COMMON_CONFIG_KEYS)
+        self.node_validate(node, ['ref', *Source.COMMON_CONFIG_KEYS])
         self.ref = self.node_get_member(node, str, 'ref', None)
 
     def preflight(self):
diff --git a/tests/sources/tar.py b/tests/sources/tar.py
index 959ff890c..9284a25a3 100644
--- a/tests/sources/tar.py
+++ b/tests/sources/tar.py
@@ -377,7 +377,7 @@ def test_netrc_already_specified_user(cli, datafiles, server_type, tmpdir):
     with create_file_server(server_type) as server:
         server.add_user('otheruser', '12345', file_server_files)
         parts = urllib.parse.urlsplit(server.base_url())
-        base_url = urllib.parse.urlunsplit([parts[0]] + ['otheruser@{}'.format(parts[1])] + list(parts[2:]))
+        base_url = urllib.parse.urlunsplit([parts[0], 'otheruser@{}'.format(parts[1]), *parts[2:]])
         generate_project_file_server(base_url, project)
 
         src_tar = os.path.join(file_server_files, 'a.tar.gz')