diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 8b13789..e69de29 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -1 +0,0 @@
-
diff --git a/doc/source/conf.py b/doc/source/conf.py
index d8fda09..ae98f81 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -19,7 +19,8 @@
 #
 import os
 import sys
-sys.path.insert(0, os.path.abspath('vendor'))
+
+sys.path.insert(0, os.path.abspath("vendor"))
 
 
 # -- General configuration ------------------------------------------------
@@ -32,18 +33,18 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.autosummary',
-    'sphinx.ext.githubpages',
-    'sphinx.ext.intersphinx',
-    'sphinx.ext.mathjax',
-    'sphinx.ext.viewcode',
-    'youtube',
-    'IPython.sphinxext.ipython_directive',
-    'IPython.sphinxext.ipython_console_highlighting',
-    'matplotlib.sphinxext.plot_directive',
-    'numpydoc',
-    'sphinx_copybutton',
+    "sphinx.ext.autodoc",
+    "sphinx.ext.autosummary",
+    "sphinx.ext.githubpages",
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.mathjax",
+    "sphinx.ext.viewcode",
+    "youtube",
+    "IPython.sphinxext.ipython_directive",
+    "IPython.sphinxext.ipython_console_highlighting",
+    "matplotlib.sphinxext.plot_directive",
+    "numpydoc",
+    "sphinx_copybutton",
 ]
 
 # Configuration options for plot_directive. See:
@@ -56,37 +57,37 @@
 numpydoc_show_class_members = False
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 #
 # source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+source_suffix = ".rst"
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # General information about the project.
-project = 'Scientific Python Cookiecutter'
-copyright = '2018, Contributors'
-author = 'Contributors'
+project = "Scientific Python Cookiecutter"
+copyright = "2018, Contributors"
+author = "Contributors"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = '0.1'
+version = "0.1"
 # The full version, including alpha/beta/rc tags.
-release = '0.1'
+release = "0.1"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #
 # 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.
@@ -94,7 +95,7 @@
 exclude_patterns = []
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = "sphinx"
 
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
@@ -105,8 +106,9 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'sphinx_rtd_theme'
+html_theme = "sphinx_rtd_theme"
 import sphinx_rtd_theme
+
 html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 # Theme options are theme-specific and customize the look and feel of a theme
@@ -118,7 +120,7 @@
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ["_static"]
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.
@@ -126,9 +128,9 @@
 # This is required for the alabaster theme
 # refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars
 html_sidebars = {
-    '**': [
-        'relations.html',  # needs 'show_related': True theme option to display
-        'searchbox.html',
+    "**": [
+        "relations.html",  # needs 'show_related': True theme option to display
+        "searchbox.html",
     ]
 }
 
@@ -136,7 +138,7 @@
 # -- Options for HTMLHelp output ------------------------------------------
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'ScientificPythonCookiecutterdoc'
+htmlhelp_basename = "ScientificPythonCookiecutterdoc"
 
 
 # -- Options for LaTeX output ---------------------------------------------
@@ -145,15 +147,12 @@
     # The paper size ('letterpaper' or 'a4paper').
     #
     # 'papersize': 'letterpaper',
-
     # The font size ('10pt', '11pt' or '12pt').
     #
     # 'pointsize': '10pt',
-
     # Additional stuff for the LaTeX preamble.
     #
     # 'preamble': '',
-
     # Latex figure (float) alignment
     #
     # 'figure_align': 'htbp',
@@ -163,8 +162,13 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, 'ScientificPythonCookiecutter.tex', 'Scientific Python Cookiecutter Documentation',
-     'Contributors', 'manual'),
+    (
+        master_doc,
+        "ScientificPythonCookiecutter.tex",
+        "Scientific Python Cookiecutter Documentation",
+        "Contributors",
+        "manual",
+    ),
 ]
 
 
@@ -173,8 +177,13 @@
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    (master_doc, 'scientificpythoncookiecutter', 'Scientific Python Cookiecutter Documentation',
-     [author], 1)
+    (
+        master_doc,
+        "scientificpythoncookiecutter",
+        "Scientific Python Cookiecutter Documentation",
+        [author],
+        1,
+    )
 ]
 
 
@@ -184,19 +193,23 @@
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, 'ScientificPythonCookiecutter', 'Scientific Python Cookiecutter Documentation',
-     author, 'ScientificPythonCookiecutter', 'One line description of project.',
-     'Miscellaneous'),
+    (
+        master_doc,
+        "ScientificPythonCookiecutter",
+        "Scientific Python Cookiecutter Documentation",
+        author,
+        "ScientificPythonCookiecutter",
+        "One line description of project.",
+        "Miscellaneous",
+    ),
 ]
 
 
-
-
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    'python': ('https://docs.python.org/3/', None),
-    'numpy': ('https://docs.scipy.org/doc/numpy/', None),
-    'scipy': ('https://docs.scipy.org/doc/scipy/reference/', None),
-    'pandas': ('https://pandas.pydata.org/pandas-docs/stable', None),
-    'matplotlib': ('https://matplotlib.org', None),
+    "python": ("https://docs.python.org/3/", None),
+    "numpy": ("https://docs.scipy.org/doc/numpy/", None),
+    "scipy": ("https://docs.scipy.org/doc/scipy/reference/", None),
+    "pandas": ("https://pandas.pydata.org/pandas-docs/stable", None),
+    "matplotlib": ("https://matplotlib.org", None),
 }
diff --git a/doc/source/test_examples.py b/doc/source/test_examples.py
index 7c92510..8f78209 100644
--- a/doc/source/test_examples.py
+++ b/doc/source/test_examples.py
@@ -1,7 +1,9 @@
 # example/tests/test_examples.py
 
 import numpy as np
+
 from ..refraction import snell
+
 # (The above is equivalent to `from example.refraction import snell`.
 # Read on for why.)
 
@@ -21,6 +23,6 @@ def test_perpendicular():
 
 def test_air_water():
     n_air, n_water = 1.00, 1.33
-    actual = snell(np.pi/4, n_air, n_water)
+    actual = snell(np.pi / 4, n_air, n_water)
     expected = 0.5605584137424605
     assert np.allclose(actual, expected)
diff --git a/doc/source/vendor/youtube.py b/doc/source/vendor/youtube.py
index a42a47d..10bbc8f 100644
--- a/doc/source/vendor/youtube.py
+++ b/doc/source/vendor/youtube.py
@@ -7,11 +7,13 @@
 from __future__ import division
 
 import re
+
 from docutils import nodes
-from docutils.parsers.rst import directives, Directive
+from docutils.parsers.rst import Directive, directives
 
 CONTROL_HEIGHT = 30
 
+
 def get_size(d, key):
     if key not in d:
         return None
@@ -20,10 +22,14 @@ def get_size(d, key):
         raise ValueError("invalid size %r" % d[key])
     return int(m.group(1)), m.group(2) or "px"
 
+
 def css(d):
     return "; ".join(sorted("%s: %s" % kv for kv in d.items()))
 
-class youtube(nodes.General, nodes.Element): pass
+
+class youtube(nodes.General, nodes.Element):
+    pass
+
 
 def visit_youtube_node(self, node):
     aspect = node["aspect"]
@@ -75,11 +81,16 @@ def visit_youtube_node(self, node):
         self.body.append(self.starttag(node, "iframe", **attrs))
         self.body.append("</iframe>")
 
+
 def depart_youtube_node(self, node):
     pass
 
-def visit_youtube_node_latex(self,node):
-    self.body.append(r'\begin{quote}\begin{center}\fbox{\url{https://www.youtu.be/%s}}\end{center}\end{quote}'%node['id'])
+
+def visit_youtube_node_latex(self, node):
+    self.body.append(
+        r"\begin{quote}\begin{center}\fbox{\url{https://www.youtu.be/%s}}\end{center}\end{quote}"
+        % node["id"]
+    )
 
 
 class YouTube(Directive):
@@ -104,20 +115,22 @@ def run(self):
             aspect = None
         width = get_size(self.options, "width")
         height = get_size(self.options, "height")
-        return [youtube(id=self.arguments[0], aspect=aspect, width=width, height=height)]
+        return [
+            youtube(id=self.arguments[0], aspect=aspect, width=width, height=height)
+        ]
 
 
 def unsupported_visit_youtube(self, node):
-    self.builder.warn('youtube: unsupported output format (node skipped)')
+    self.builder.warn("youtube: unsupported output format (node skipped)")
     raise nodes.SkipNode
 
 
 _NODE_VISITORS = {
-    'html': (visit_youtube_node, depart_youtube_node),
-    'latex': (visit_youtube_node_latex, depart_youtube_node),
-    'man': (unsupported_visit_youtube, None),
-    'texinfo': (unsupported_visit_youtube, None),
-    'text': (unsupported_visit_youtube, None)
+    "html": (visit_youtube_node, depart_youtube_node),
+    "latex": (visit_youtube_node_latex, depart_youtube_node),
+    "man": (unsupported_visit_youtube, None),
+    "texinfo": (unsupported_visit_youtube, None),
+    "text": (unsupported_visit_youtube, None),
 }
 
 
diff --git a/run_cookiecutter_example.py b/run_cookiecutter_example.py
index b991e83..37816c6 100644
--- a/run_cookiecutter_example.py
+++ b/run_cookiecutter_example.py
@@ -1,34 +1,34 @@
 #!/usr/bin/env python3
 import pexpect
 
-p = pexpect.spawn('cookiecutter .')
+p = pexpect.spawn("cookiecutter .")
 
-p.expect('full_name .*')
-p.sendline('Brookhaven National Lab')
+p.expect("full_name .*")
+p.sendline("Brookhaven National Lab")
 
-p.expect('email .*')
-p.sendline('dallan@bnl.gov')
+p.expect("email .*")
+p.sendline("dallan@bnl.gov")
 
-p.expect('github_username .*')
-p.sendline('danielballan')
+p.expect("github_username .*")
+p.sendline("danielballan")
 
-p.expect('project_name .*')
-p.sendline('Example')
+p.expect("project_name .*")
+p.sendline("Example")
 
-p.expect('package_dist_name .*')
-p.sendline('')
+p.expect("package_dist_name .*")
+p.sendline("")
 
-p.expect('package_dir_name .*')
-p.sendline('')
+p.expect("package_dir_name .*")
+p.sendline("")
 
-p.expect('repo_name .*')
-p.sendline('')
+p.expect("repo_name .*")
+p.sendline("")
 
-p.expect('project_short_description .*')
-p.sendline('')
+p.expect("project_short_description .*")
+p.sendline("")
 
-p.expect('Select minimum_supported_python_version.*')
-p.sendline('')
+p.expect("Select minimum_supported_python_version.*")
+p.sendline("")
 
 # Runs until the cookiecutter is done; then exits.
 p.interact()
diff --git a/{{ cookiecutter.repo_name }}/setup.py b/{{ cookiecutter.repo_name }}/setup.py
index 00d4663..e7cf5af 100644
--- a/{{ cookiecutter.repo_name }}/setup.py	
+++ b/{{ cookiecutter.repo_name }}/setup.py	
@@ -1,16 +1,15 @@
 import sys
 from os import path
 
-from setuptools import find_packages, setup
-
 import versioneer
+from setuptools import find_packages, setup
 
 # NOTE: This file must remain Python 2 compatible for the foreseeable future,
 # to ensure that we error out properly for people with outdated setuptools
 # and/or pip.
 min_version = (
-    {{ cookiecutter.minimum_supported_python_version[0] }},
-    {{ cookiecutter.minimum_supported_python_version[2] }},
+    {{cookiecutter.minimum_supported_python_version[0]}},
+    {{cookiecutter.minimum_supported_python_version[2]}},
 )
 if sys.version_info < min_version:
     error = """
@@ -35,7 +34,11 @@
 
 with open(path.join(here, "requirements.txt")) as requirements_file:
     # Parse requirements.txt, ignoring any commented-out lines.
-    requirements = [line for line in requirements_file.read().splitlines() if not line.startswith("#")]
+    requirements = [
+        line
+        for line in requirements_file.read().splitlines()
+        if not line.startswith("#")
+    ]
 
 
 setup(
diff --git a/{{ cookiecutter.repo_name }}/src/diffpy/{{ cookiecutter.package_dir_name }}/version.py b/{{ cookiecutter.repo_name }}/src/diffpy/{{ cookiecutter.package_dir_name }}/version.py
index 15488a1..29026d6 100644
--- a/{{ cookiecutter.repo_name }}/src/diffpy/{{ cookiecutter.package_dir_name }}/version.py	
+++ b/{{ cookiecutter.repo_name }}/src/diffpy/{{ cookiecutter.package_dir_name }}/version.py	
@@ -131,7 +131,10 @@ def versions_from_parentdir(parentdir_prefix, root, verbose):
             root = os.path.dirname(root)  # up a level
 
     if verbose:
-        print("Tried directories %s but none started with prefix %s" % (str(rootdirs), parentdir_prefix))
+        print(
+            "Tried directories %s but none started with prefix %s"
+            % (str(rootdirs), parentdir_prefix)
+        )
     raise NotThisMethod("rootdir doesn't start with parentdir_prefix")
 
 
@@ -319,7 +322,9 @@ def git_pieces_from_vcs(tag_prefix, root, verbose, run_command=run_command):
         pieces["distance"] = int(count_out)  # total number of commits
 
     # commit date: see ISO-8601 comment in git_versions_from_keywords()
-    date = run_command(GITS, ["show", "-s", "--format=%ci", "HEAD"], cwd=root)[0].strip()
+    date = run_command(GITS, ["show", "-s", "--format=%ci", "HEAD"], cwd=root)[
+        0
+    ].strip()
     pieces["date"] = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
 
     return pieces