Reformat code with new single elem tuple unpack syntax

refs psf/black#1108

Author: dhimmel

.travis.yml

@@ -15,7 +15,9 @@ install:
   - python setup.py sdist bdist_wheel
 script:
   - pytest --verbose --color=yes
-  # if the following command fails, run `black .` locally to reformat the code
+  # if the following command fails, run `black .` locally to reformat the code.
+  # ensure your local version of black matches the version installed on Travis,
+  # which will usually be the latest version from https://pypi.org/project/black/
   - black --check --diff .
   # temporary workaround for portray "Module not found" error https://git.io/JeR9C
   - export PYTHONPATH=.

manubot/cite/arxiv.py

@@ -36,7 +36,7 @@ def get_arxiv_csl_item(arxiv_id):
 
     # Parse XML
     xml_tree = xml.etree.ElementTree.fromstring(response.text)
-    entry, = xml_tree.findall(prefix + "entry")
+    (entry,) = xml_tree.findall(prefix + "entry")
 
     # Create dictionary for CSL Item
     csl_item = collections.OrderedDict()

manubot/cite/csl_item.py

@@ -115,7 +115,7 @@ def prune_against_schema(self):
         """
         from .citeproc import remove_jsonschema_errors
 
-        csl_item, = remove_jsonschema_errors([self], in_place=True)
+        (csl_item,) = remove_jsonschema_errors([self], in_place=True)
         assert csl_item is self
         return self
 

manubot/cite/isbn.py

@@ -57,7 +57,7 @@ def get_isbn_csl_item_citoid(isbn):
                 f"Unable to extract CSL from JSON metadata for ISBN {isbn}:\n"
                 f"{json.dumps(result.text)}"
             )
-    mediawiki, = result
+    (mediawiki,) = result
     csl_item = collections.OrderedDict()
     csl_item["type"] = mediawiki.get("itemType", "book")
     if "title" in mediawiki:

manubot/cite/pubmed.py

@@ -81,7 +81,7 @@ def get_pubmed_csl_item(pmid):
         response = requests.get(url, params, headers=headers)
     try:
         element_tree = xml.etree.ElementTree.fromstring(response.text)
-        element_tree, = list(element_tree)
+        (element_tree,) = list(element_tree)
     except Exception as error:
         logging.error(
             f"Error fetching PubMed metadata for {pmid}.\n"
@@ -248,7 +248,7 @@ def get_pmcid_and_pmid_for_doi(doi):
             f"Response from {response.url}:\n{response.text}"
         )
         return {}
-    record, = records
+    (record,) = records
     if record.findtext("status", default="okay") == "error":
         return {}
     id_dict = {}
@@ -288,7 +288,7 @@ def get_pmid_for_doi(doi):
             f"Response from {response.url}:\n{response.text}"
         )
         return None
-    id_elem, = id_elems
+    (id_elem,) = id_elems
     return id_elem.text
 
 

manubot/cite/tests/test_cite_command.py

@@ -30,7 +30,7 @@ def test_cite_command_stdout():
     )
     print(process.stderr)
     assert process.returncode == 0
-    csl, = json.loads(process.stdout)
+    (csl,) = json.loads(process.stdout)
     assert csl["URL"] == "https://arxiv.org/abs/1806.05726v1"
 
 
@@ -44,7 +44,7 @@ def test_cite_command_file(tmpdir):
     print(process.stderr.decode())
     assert process.returncode == 0
     with path.open() as read_file:
-        csl, = json.load(read_file)
+        (csl,) = json.load(read_file)
     assert csl["URL"] == "https://arxiv.org/abs/1806.05726v1"
 
 

manubot/cite/tests/test_zotero.py

@@ -71,7 +71,7 @@ def test_web_query_returns_single_result_legacy_manubot_url():
     zotero_metadata = web_query(url)
     assert isinstance(zotero_metadata, list)
     assert len(zotero_metadata) == 1
-    zotero_metadata, = zotero_metadata
+    (zotero_metadata,) = zotero_metadata
     assert (
         zotero_metadata["title"]
         == "Sci-Hub provides access to nearly all scholarly literature"
@@ -92,7 +92,7 @@ def test_web_query_returns_single_result_pubmed_url():
     zotero_metadata = web_query(url)
     assert isinstance(zotero_metadata, list)
     assert len(zotero_metadata) == 1
-    zotero_metadata, = zotero_metadata
+    (zotero_metadata,) = zotero_metadata
     assert zotero_metadata["title"] == "sci-hub[title] - PubMed - NCBI"
 
 

manubot/cite/url.py

@@ -32,7 +32,7 @@ def get_url_csl_item_zotero(url):
 
     zotero_data = web_query(url)
     csl_data = export_as_csl(zotero_data)
-    csl_item, = csl_data
+    (csl_item,) = csl_data
     return csl_item
 
 

manubot/cite/zotero.py

@@ -112,5 +112,5 @@ def get_csl_item(identifier: str):
     """
     zotero_data = search_query(identifier)
     csl_data = export_as_csl(zotero_data)
-    csl_item, = csl_data
+    (csl_item,) = csl_data
     return csl_item