diff --git a/docs/conf.py b/docs/conf.py
index ea40908..be4a3c6 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -90,7 +90,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = 'en'
+language = "en"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
diff --git a/giddy/ergodic.py b/giddy/ergodic.py
index 74a2b08..73d91ff 100644
--- a/giddy/ergodic.py
+++ b/giddy/ergodic.py
@@ -148,8 +148,11 @@ def steady_state(P, fill_empty_classes=False):
 
 
 def _fmpt_ergodic(P):
-    warn('_fmpt_ergodic is deprecated. It will be replaced in giddy 2.5 with _mfpt_',
-         DeprecationWarning, stacklevel=2)
+    warn(
+        "_fmpt_ergodic is deprecated. It will be replaced in giddy 2.5 with _mfpt_",
+        DeprecationWarning,
+        stacklevel=2,
+    )
     return _mfpt_ergodic(P)
 
 
@@ -213,8 +216,11 @@ def _mfpt_ergodic(P):
 
 
 def fmpt(P, fill_empty_classes=False):
-    warn('fmpt is deprecated. It will be replaced in giddy 2.5 with mfpt',
-         DeprecationWarning, stacklevel=2)
+    warn(
+        "fmpt is deprecated. It will be replaced in giddy 2.5 with mfpt",
+        DeprecationWarning,
+        stacklevel=2,
+    )
     return mfpt(P, fill_empty_classes)
 
 
@@ -346,8 +352,11 @@ def mfpt(P, fill_empty_classes=False):
 
 
 def var_fmpt_ergodic(p):
-    warn('var_fmpt_ergodic is deprecated. It will be replaced in giddy 2.5 with var_fmpt_ergodic',
-         DeprecationWarning, stacklevel=2)
+    warn(
+        "var_fmpt_ergodic is deprecated. It will be replaced in giddy 2.5 with var_fmpt_ergodic",
+        DeprecationWarning,
+        stacklevel=2,
+    )
     return var_mfpt_ergodic(p)
 
 
diff --git a/giddy/markov.py b/giddy/markov.py
index 431afac..6876613 100644
--- a/giddy/markov.py
+++ b/giddy/markov.py
@@ -284,7 +284,7 @@ def __init__(self, class_ids, classes=None, fill_empty_classes=False, summary=Tr
 
     @property
     def mfpt(self):
-        warn('self._mfpt is deprecated. Please use self._mfpt')
+        warn("self._mfpt is deprecated. Please use self._mfpt")
         if not hasattr(self, "_mfpt"):
             self._mfpt = mfpt(self.p, fill_empty_classes=True)
         return self._mfpt
@@ -800,7 +800,6 @@ def __init__(
         variable_name=None,
         fill_empty_classes=False,
     ):
-
         y = np.asarray(y)
         self.fixed = fixed
         self.discrete = discrete
@@ -2038,7 +2037,6 @@ class FullRank_Markov(Markov):
     """
 
     def __init__(self, y, fill_empty_classes=False, summary=True):
-
         y = np.asarray(y)
         # resolve ties: All values are given a distinct rank, corresponding
         # to the order that the values occur in each cross section.
diff --git a/giddy/rank.py b/giddy/rank.py
index 076f2a7..d89fff9 100644
--- a/giddy/rank.py
+++ b/giddy/rank.py
@@ -351,7 +351,6 @@ class SpatialTau(object):
     """
 
     def __init__(self, x, y, w, permutations=0):
-
         w.transform = "b"
         self.n = len(x)
         res = Tau(x, y)
@@ -478,7 +477,6 @@ class Tau_Local:
     """
 
     def __init__(self, x, y):
-
         self.n = len(x)
         x = np.asarray(x)
         y = np.asarray(y)
@@ -596,7 +594,6 @@ class Tau_Local_Neighbor:
     """
 
     def __init__(self, x, y, w, permutations=0):
-
         x = np.asarray(x)
         y = np.asarray(y)
         self.n = len(x)
@@ -751,7 +748,6 @@ class Tau_Local_Neighborhood:
     """
 
     def __init__(self, x, y, w, permutations=0):
-
         x = np.asarray(x)
         y = np.asarray(y)
         res = Tau_Local(x, y)
@@ -885,7 +881,6 @@ class Tau_Regional:
     """
 
     def __init__(self, x, y, regime, permutations=0):
-
         x = np.asarray(x)
         y = np.asarray(y)
         res = Tau_Local(x, y)
@@ -926,7 +921,6 @@ def __init__(self, x, y, regime, permutations=0):
             self.tau_reg_pvalues = pvalues
 
     def _calc(self, W, WH, P, S):
-
         nomi = np.dot(P, np.dot(S, P.T))
         denomi = np.dot(P, np.dot(W, P.T)) + np.dot(P, np.dot(WH, P.T))
         T = nomi / denomi
diff --git a/giddy/sequence.py b/giddy/sequence.py
index 768fd81..4eb3ccd 100644
--- a/giddy/sequence.py
+++ b/giddy/sequence.py
@@ -11,6 +11,7 @@
 import scipy.spatial.distance as d
 from .markov import Markov
 
+
 class Sequence(object):
     """
     Pairwise sequence analysis.
@@ -153,7 +154,6 @@ class Sequence(object):
     """
 
     def __init__(self, y, subs_mat=None, dist_type=None, indel=None, cluster_type=None):
-
         y = np.asarray(y)
         merged = list(itertools.chain.from_iterable(y))
         self.classes = np.unique(merged)
@@ -192,7 +192,9 @@ def __init__(self, y, subs_mat=None, dist_type=None, indel=None, cluster_type=No
                             "sequences of unequal lengths!"
                         )
 
-                    hamming_dist = d.pdist(y_int.astype(int), metric="hamming") * y_int.shape[1]
+                    hamming_dist = (
+                        d.pdist(y_int.astype(int), metric="hamming") * y_int.shape[1]
+                    )
                     self.seq_dis_mat = d.squareform(hamming_dist)
 
                 elif dist_type.lower() == "arbitrary":
diff --git a/notebooks/RankBasedMethods.ipynb b/notebooks/RankBasedMethods.ipynb
index da5781c..9b43b7e 100644
--- a/notebooks/RankBasedMethods.ipynb
+++ b/notebooks/RankBasedMethods.ipynb
@@ -968,11 +968,15 @@
     "from libpysal.weights import block_weights\n",
     "\n",
     "with warnings.catch_warnings():\n",
-    "    warnings.filterwarnings(\"ignore\", message=\"The weights matrix is not fully connected\")\n",
+    "    warnings.filterwarnings(\n",
+    "        \"ignore\", message=\"The weights matrix is not fully connected\"\n",
+    "    )\n",
     "\n",
     "    w = block_weights(complete_table[\"BEA region\"])\n",
     "    np.random.seed(12345)\n",
-    "    tau_w = giddy.rank.SpatialTau(complete_table[\"1929\"], complete_table[\"2009\"], w, 999)"
+    "    tau_w = giddy.rank.SpatialTau(\n",
+    "        complete_table[\"1929\"], complete_table[\"2009\"], w, 999\n",
+    "    )"
    ]
   },
   {
@@ -1244,11 +1248,16 @@
    "outputs": [],
    "source": [
     "with warnings.catch_warnings():\n",
-    "    warnings.filterwarnings(\"ignore\", message=\"The weights matrix is not fully connected\")\n",
+    "    warnings.filterwarnings(\n",
+    "        \"ignore\", message=\"The weights matrix is not fully connected\"\n",
+    "    )\n",
     "    np.random.seed(12345)\n",
-    "    \n",
+    "\n",
     "    tau_w = giddy.rank.Tau_Regional(\n",
-    "        complete_table[\"1929\"], complete_table[\"2009\"], complete_table[\"BEA region\"], 999\n",
+    "        complete_table[\"1929\"],\n",
+    "        complete_table[\"2009\"],\n",
+    "        complete_table[\"BEA region\"],\n",
+    "        999,\n",
     "    )"
    ]
   },
diff --git a/requirements_docs.txt b/requirements_docs.txt
index 7134d48..e2e48c6 100644
--- a/requirements_docs.txt
+++ b/requirements_docs.txt
@@ -1,5 +1,4 @@
 nbsphinx
-nbsphinx-link
 numpydoc
 sphinx>=1.4.3
 sphinxcontrib-bibtex
diff --git a/tools/gitcount.ipynb b/tools/gitcount.ipynb
index ffc28d3..ed19906 100644
--- a/tools/gitcount.ipynb
+++ b/tools/gitcount.ipynb
@@ -27,8 +27,15 @@
    "source": [
     "#  get date of last tag\n",
     "from subprocess import Popen, PIPE\n",
-    "x, err = Popen('git log -1 --tags --simplify-by-decoration --pretty=\"%ai\"| cat', stdin=PIPE, stdout=PIPE, stderr=PIPE, shell=True).communicate()\n",
-    "start_date = x.split()[0].decode('utf-8')\n",
+    "\n",
+    "x, err = Popen(\n",
+    "    'git log -1 --tags --simplify-by-decoration --pretty=\"%ai\"| cat',\n",
+    "    stdin=PIPE,\n",
+    "    stdout=PIPE,\n",
+    "    stderr=PIPE,\n",
+    "    shell=True,\n",
+    ").communicate()\n",
+    "start_date = x.split()[0].decode(\"utf-8\")\n",
     "start_date"
    ]
   },
@@ -40,6 +47,7 @@
    "source": [
     "#  today's date\n",
     "import datetime\n",
+    "\n",
     "release_date = str(datetime.datetime.today()).split()[0]\n",
     "release_date"
    ]
@@ -50,7 +58,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "package_name = 'giddy'\n",
+    "package_name = \"giddy\"\n",
     "# release_date = '2019-12-20'\n",
     "# start_date = '2019-12-20'"
    ]
@@ -78,6 +86,7 @@
     "from datetime import datetime, timedelta\n",
     "from time import sleep\n",
     "from subprocess import check_output\n",
+    "\n",
     "try:\n",
     "    from urllib import urlopen\n",
     "except:\n",
@@ -86,7 +95,7 @@
     "import ssl\n",
     "import yaml\n",
     "\n",
-    "context = ssl._create_unverified_context()\n"
+    "context = ssl._create_unverified_context()"
    ]
   },
   {
@@ -115,7 +124,7 @@
    "source": [
     "since_date = '--since=\"{start}\"'.format(start=start_date)\n",
     "since_date\n",
-    "since = datetime.strptime(start_date+\" 0:0:0\", \"%Y-%m-%d %H:%M:%S\")\n",
+    "since = datetime.strptime(start_date + \" 0:0:0\", \"%Y-%m-%d %H:%M:%S\")\n",
     "since"
    ]
   },
@@ -128,9 +137,8 @@
     "# get __version__\n",
     "f = \"../{package}/__init__.py\".format(package=package_name)\n",
     "\n",
-    "with open(f, 'r') as initfile:\n",
-    "     exec(initfile.readline())\n",
-    "   "
+    "with open(f, \"r\") as initfile:\n",
+    "    exec(initfile.readline())"
    ]
   },
   {
@@ -146,7 +154,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "cmd = ['git', 'log', '--oneline', since_date]\n",
+    "cmd = [\"git\", \"log\", \"--oneline\", since_date]\n",
     "ncommits = len(check_output(cmd).splitlines())"
    ]
   },
@@ -179,21 +187,23 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "identities = {'Levi John Wolf': ('ljwolf', 'Levi John Wolf'),\n",
-    "              'Serge Rey': ('Serge Rey', 'Sergio Rey', 'sjsrey', 'serge'),\n",
-    "              'Wei Kang': ('Wei Kang', 'weikang9009'),\n",
-    "              'Dani Arribas-Bel': ('Dani Arribas-Bel', 'darribas')\n",
+    "identities = {\n",
+    "    \"Levi John Wolf\": (\"ljwolf\", \"Levi John Wolf\"),\n",
+    "    \"Serge Rey\": (\"Serge Rey\", \"Sergio Rey\", \"sjsrey\", \"serge\"),\n",
+    "    \"Wei Kang\": (\"Wei Kang\", \"weikang9009\"),\n",
+    "    \"Dani Arribas-Bel\": (\"Dani Arribas-Bel\", \"darribas\"),\n",
     "}\n",
     "\n",
+    "\n",
     "def regularize_identity(string):\n",
     "    string = string.decode()\n",
     "    for name, aliases in identities.items():\n",
     "        for alias in aliases:\n",
     "            if alias in string:\n",
     "                string = string.replace(alias, name)\n",
-    "    if len(string.split(' '))>1:\n",
+    "    if len(string.split(\" \")) > 1:\n",
     "        string = string.title()\n",
-    "    return string.lstrip('* ')"
+    "    return string.lstrip(\"* \")"
    ]
   },
   {
@@ -202,7 +212,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "author_cmd = ['git', 'log', '--format=* %aN', since_date]"
+    "author_cmd = [\"git\", \"log\", \"--format=* %aN\", since_date]"
    ]
   },
   {
@@ -220,13 +230,12 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "\n",
     "ncommits = len(check_output(cmd).splitlines())\n",
     "all_authors = check_output(author_cmd).splitlines()\n",
     "counter = Counter([regularize_identity(author) for author in all_authors])\n",
     "#        global_counter += counter\n",
     "#        counters.update({'.'.join((package,subpackage)): counter})\n",
-    "unique_authors = sorted(set(all_authors))\n"
+    "unique_authors = sorted(set(all_authors))"
    ]
   },
   {
@@ -261,10 +270,11 @@
    "outputs": [],
    "source": [
     "from datetime import datetime, timedelta\n",
+    "\n",
     "ISO8601 = \"%Y-%m-%dT%H:%M:%SZ\"\n",
     "PER_PAGE = 100\n",
-    "element_pat = re.compile(r'<(.+?)>')\n",
-    "rel_pat = re.compile(r'rel=[\\'\"](\\w+)[\\'\"]')\n"
+    "element_pat = re.compile(r\"<(.+?)>\")\n",
+    "rel_pat = re.compile(r'rel=[\\'\"](\\w+)[\\'\"]')"
    ]
   },
   {
@@ -273,31 +283,37 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "\n",
     "def parse_link_header(headers):\n",
-    "    link_s = headers.get('link', '')\n",
+    "    link_s = headers.get(\"link\", \"\")\n",
     "    urls = element_pat.findall(link_s)\n",
     "    rels = rel_pat.findall(link_s)\n",
     "    d = {}\n",
-    "    for rel,url in zip(rels, urls):\n",
+    "    for rel, url in zip(rels, urls):\n",
     "        d[rel] = url\n",
     "    return d\n",
     "\n",
+    "\n",
     "def get_paged_request(url):\n",
     "    \"\"\"get a full list, handling APIv3's paging\"\"\"\n",
     "    results = []\n",
     "    while url:\n",
-    "        #print(\"fetching %s\" % url, file=sys.stderr)\n",
+    "        # print(\"fetching %s\" % url, file=sys.stderr)\n",
     "        f = urlopen(url)\n",
     "        results.extend(json.load(f))\n",
     "        links = parse_link_header(f.headers)\n",
-    "        url = links.get('next')\n",
+    "        url = links.get(\"next\")\n",
     "    return results\n",
     "\n",
+    "\n",
     "def get_issues(project=\"pysal/giddy\", state=\"closed\", pulls=False):\n",
     "    \"\"\"Get a list of the issues from the Github API.\"\"\"\n",
-    "    which = 'pulls' if pulls else 'issues'\n",
-    "    url = \"https://api.github.com/repos/%s/%s?state=%s&per_page=%i\" % (project, which, state, PER_PAGE)\n",
+    "    which = \"pulls\" if pulls else \"issues\"\n",
+    "    url = \"https://api.github.com/repos/%s/%s?state=%s&per_page=%i\" % (\n",
+    "        project,\n",
+    "        which,\n",
+    "        state,\n",
+    "        PER_PAGE,\n",
+    "    )\n",
     "    return get_paged_request(url)\n",
     "\n",
     "\n",
@@ -313,54 +329,54 @@
     "    \"\"\"Convert a list of issues to a dict, keyed by issue number.\"\"\"\n",
     "    idict = {}\n",
     "    for i in issues:\n",
-    "        idict[i['number']] = i\n",
+    "        idict[i[\"number\"]] = i\n",
     "    return idict\n",
     "\n",
     "\n",
     "def is_pull_request(issue):\n",
     "    \"\"\"Return True if the given issue is a pull request.\"\"\"\n",
-    "    return 'pull_request_url' in issue\n",
+    "    return \"pull_request_url\" in issue\n",
     "\n",
     "\n",
     "def issues_closed_since(period=timedelta(days=365), project=\"pysal/pysal\", pulls=False):\n",
     "    \"\"\"Get all issues closed since a particular point in time. period\n",
-    "can either be a datetime object, or a timedelta object. In the\n",
-    "latter case, it is used as a time before the present.\"\"\"\n",
+    "    can either be a datetime object, or a timedelta object. In the\n",
+    "    latter case, it is used as a time before the present.\"\"\"\n",
     "\n",
-    "    which = 'pulls' if pulls else 'issues'\n",
+    "    which = \"pulls\" if pulls else \"issues\"\n",
     "\n",
     "    if isinstance(period, timedelta):\n",
     "        period = datetime.now() - period\n",
-    "    url = \"https://api.github.com/repos/%s/%s?state=closed&sort=updated&since=%s&per_page=%i\" % (project, which, period.strftime(ISO8601), PER_PAGE)\n",
+    "    url = (\n",
+    "        \"https://api.github.com/repos/%s/%s?state=closed&sort=updated&since=%s&per_page=%i\"\n",
+    "        % (project, which, period.strftime(ISO8601), PER_PAGE)\n",
+    "    )\n",
     "    allclosed = get_paged_request(url)\n",
     "    # allclosed = get_issues(project=project, state='closed', pulls=pulls, since=period)\n",
-    "    filtered = [i for i in allclosed if _parse_datetime(i['closed_at']) > period]\n",
+    "    filtered = [i for i in allclosed if _parse_datetime(i[\"closed_at\"]) > period]\n",
     "\n",
     "    # exclude rejected PRs\n",
     "    if pulls:\n",
-    "        filtered = [ pr for pr in filtered if pr['merged_at'] ]\n",
+    "        filtered = [pr for pr in filtered if pr[\"merged_at\"]]\n",
     "\n",
     "    return filtered\n",
     "\n",
     "\n",
-    "def sorted_by_field(issues, field='closed_at', reverse=False):\n",
+    "def sorted_by_field(issues, field=\"closed_at\", reverse=False):\n",
     "    \"\"\"Return a list of issues sorted by closing date date.\"\"\"\n",
-    "    return sorted(issues, key = lambda i:i[field], reverse=reverse)\n",
+    "    return sorted(issues, key=lambda i: i[field], reverse=reverse)\n",
     "\n",
     "\n",
     "def report(issues, show_urls=False):\n",
-    "    \"\"\"Summary report about a list of issues, printing number and title.\n",
-    "    \"\"\"\n",
+    "    \"\"\"Summary report about a list of issues, printing number and title.\"\"\"\n",
     "    # titles may have unicode in them, so we must encode everything below\n",
     "    if show_urls:\n",
     "        for i in issues:\n",
-    "            role = 'ghpull' if 'merged_at' in i else 'ghissue'\n",
-    "            print('* :%s:`%d`: %s' % (role, i['number'],\n",
-    "                                        i['title'].encode('utf-8')))\n",
+    "            role = \"ghpull\" if \"merged_at\" in i else \"ghissue\"\n",
+    "            print(\"* :%s:`%d`: %s\" % (role, i[\"number\"], i[\"title\"].encode(\"utf-8\")))\n",
     "    else:\n",
     "        for i in issues:\n",
-    "            print('* %d: %s' % (i['number'], i['title'].encode('utf-8')))\n",
-    "\n"
+    "            print(\"* %d: %s\" % (i[\"number\"], i[\"title\"].encode(\"utf-8\")))"
    ]
   },
   {
@@ -369,18 +385,17 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "\n",
     "all_issues = {}\n",
     "all_pulls = {}\n",
     "total_commits = 0\n",
-    "#prj='pysal/libpysal'\n",
-    "prj = 'pysal/{package}'.format(package=package_name)\n",
-    "issues = issues_closed_since(since, project=prj,pulls=False)\n",
-    "pulls = issues_closed_since(since, project=prj,pulls=True)\n",
+    "# prj='pysal/libpysal'\n",
+    "prj = \"pysal/{package}\".format(package=package_name)\n",
+    "issues = issues_closed_since(since, project=prj, pulls=False)\n",
+    "pulls = issues_closed_since(since, project=prj, pulls=True)\n",
     "issues = sorted_by_field(issues, reverse=True)\n",
     "pulls = sorted_by_field(pulls, reverse=True)\n",
     "n_issues, n_pulls = map(len, (issues, pulls))\n",
-    "n_total = n_issues + n_pulls\n"
+    "n_total = n_issues + n_pulls"
    ]
   },
   {
@@ -391,7 +406,7 @@
    "source": [
     "issue_listing = []\n",
     "for issue in issues:\n",
-    "    entry = \"{title} (#{number})\".format(title=issue['title'],number=issue['number'])\n",
+    "    entry = \"{title} (#{number})\".format(title=issue[\"title\"], number=issue[\"number\"])\n",
     "    issue_listing.append(entry)"
    ]
   },
@@ -403,7 +418,7 @@
    "source": [
     "pull_listing = []\n",
     "for pull in pulls:\n",
-    "    entry = \"{title} (#{number})\".format(title=pull['title'],number=pull['number'])\n",
+    "    entry = \"{title} (#{number})\".format(title=pull[\"title\"], number=pull[\"number\"])\n",
     "    pull_listing.append(entry)"
    ]
   },
@@ -422,7 +437,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "message = \"We closed a total of {total} issues (enhancements and bug fixes) through {pr} pull requests\".format(total=n_total, pr=n_pulls)"
+    "message = \"We closed a total of {total} issues (enhancements and bug fixes) through {pr} pull requests\".format(\n",
+    "    total=n_total, pr=n_pulls\n",
+    ")"
    ]
   },
   {
@@ -431,7 +448,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "message = \"{msg}, since our last release on {previous}.\".format(msg=message, previous=str(start_date))\n"
+    "message = \"{msg}, since our last release on {previous}.\".format(\n",
+    "    msg=message, previous=str(start_date)\n",
+    ")"
    ]
   },
   {
@@ -467,10 +486,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "issues = \"\\n\".join([\"  - \"+issue for issue in issue_listing])\n",
+    "issues = \"\\n\".join([\"  - \" + issue for issue in issue_listing])\n",
     "message += issues\n",
     "message += \"\\n\\n## Pull Requests\\n\"\n",
-    "pulls = \"\\n\".join([\"  - \"+pull for pull in pull_listing])\n",
+    "pulls = \"\\n\".join([\"  - \" + pull for pull in pull_listing])\n",
     "message += pulls"
    ]
   },
@@ -489,7 +508,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "people = \"\\n\".join([\"  - \"+person for person in unique_authors])"
+    "people = \"\\n\".join([\"  - \" + person for person in unique_authors])"
    ]
   },
   {
@@ -507,7 +526,11 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "message +=\"\\n\\nThe following individuals contributed to this release:\\n\\n{people}\".format(people=people)"
+    "message += (\n",
+    "    \"\\n\\nThe following individuals contributed to this release:\\n\\n{people}\".format(\n",
+    "        people=people\n",
+    "    )\n",
+    ")"
    ]
   },
   {
@@ -525,7 +548,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "head = \"# Version {version} ({release_date})\\n\\n\".format(version=__version__, release_date=release_date)"
+    "head = \"# Version {version} ({release_date})\\n\\n\".format(\n",
+    "    version=__version__, release_date=release_date\n",
+    ")"
    ]
   },
   {
@@ -544,7 +569,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# #insert the new changes in the begining of CHANGELOG.md \n",
+    "# #insert the new changes in the begining of CHANGELOG.md\n",
     "# with open(\"../CHANGELOG.md\", 'r+') as file:\n",
     "#     content = file.read()\n",
     "#     file.seek(0, 0)\n",
@@ -558,9 +583,9 @@
    "outputs": [],
    "source": [
     "# outfile = 'changelog_{version}.md'.format(version=__version__)\n",
-    "outfile = 'changelog.md'\n",
-    "with open(outfile, 'w') as of:\n",
-    "    of.write(head+message)"
+    "outfile = \"changelog.md\"\n",
+    "with open(outfile, \"w\") as of:\n",
+    "    of.write(head + message)"
    ]
   },
   {