diff --git a/Makefile b/Makefile
index 5f078ed..594b4de 100644
--- a/Makefile
+++ b/Makefile
@@ -120,7 +120,7 @@ watch-$(SPHINX_SOURCEDIR):   ##
 	$(SPHINX_AUTOBUILD) $(SPHINX_SOURCEDIR) $(shell mktemp -d)
 
 format:   ## Reformats the whole codebase using our standards (requires black and isort).
-	black -l 120 --skip-string-normalization .
+	black -l 120 .
 	isort -rc -o mondrian -o whistle -y .
 
 medikit:   # Checks installed medikit version and updates it if it is outdated.
diff --git a/Projectfile b/Projectfile
index 0355430..590f670 100644
--- a/Projectfile
+++ b/Projectfile
@@ -87,7 +87,7 @@ def on_make_generate(event):
     makefile.add_target(
         'format',
         '''
-            black -l 120 --skip-string-normalization .
+            black -l 120 .
             isort -rc -o mondrian -o whistle -y .
         ''',
         phony=True,
diff --git a/benchmarks/parameters.py b/benchmarks/parameters.py
index f8e63a1..53664b5 100644
--- a/benchmarks/parameters.py
+++ b/benchmarks/parameters.py
@@ -16,11 +16,11 @@ import timeit
 
 
 def j1(d):
-    return {'prepend': 'foo', **d, 'append': 'bar'}
+    return {"prepend": "foo", **d, "append": "bar"}
 
 
 def k1(**d):
-    return {'prepend': 'foo', **d, 'append': 'bar'}
+    return {"prepend": "foo", **d, "append": "bar"}
 
 
 def j2(d):
@@ -39,17 +39,17 @@ def k3(**d):
     return None
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     import timeit
 
-    with open('person.json') as f:
+    with open("person.json") as f:
         json_data = json.load(f)
 
     for i in 1, 2, 3:
         print(
-            'j{}'.format(i), timeit.timeit("j{}({!r})".format(i, json_data), setup="from __main__ import j{}".format(i))
+            "j{}".format(i), timeit.timeit("j{}({!r})".format(i, json_data), setup="from __main__ import j{}".format(i))
         )
         print(
-            'k{}'.format(i),
+            "k{}".format(i),
             timeit.timeit("k{}(**{!r})".format(i, json_data), setup="from __main__ import k{}".format(i)),
         )
diff --git a/bin/update_apidoc.py b/bin/update_apidoc.py
index 4ed763f..9a31a62 100644
--- a/bin/update_apidoc.py
+++ b/bin/update_apidoc.py
@@ -2,48 +2,48 @@ import os
 
 from jinja2 import DictLoader, Environment
 
-__path__ = os.path.realpath(os.path.join(os.getcwd(), os.path.dirname(__file__), '..'))
+__path__ = os.path.realpath(os.path.join(os.getcwd(), os.path.dirname(__file__), ".."))
 
-apidoc_root = 'docs/reference/api'
+apidoc_root = "docs/reference/api"
 
 
 class Module:
     def __init__(self, name, title=None, *, automodule_options=None):
 
         self.name = name
-        self.title = title or ' '.join(map(str.title, self.name.split('.')[1:]))
+        self.title = title or " ".join(map(str.title, self.name.split(".")[1:]))
         self.automodule_options = automodule_options or list()
 
     def __repr__(self):
-        return '<{} ({})>'.format(self.title, self.name)
+        return "<{} ({})>".format(self.title, self.name)
 
     def asdict(self):
-        return {'name': self.name, 'title': self.title, 'automodule_options': self.automodule_options}
+        return {"name": self.name, "title": self.title, "automodule_options": self.automodule_options}
 
     def get_path(self):
-        return os.path.join(__path__, apidoc_root, *self.name.split('.')) + '.rst'
+        return os.path.join(__path__, apidoc_root, *self.name.split(".")) + ".rst"
 
 
 modules = [
-    Module('bonobo', title='Bonobo'),
-    Module('bonobo.config'),
-    Module('bonobo.constants', automodule_options=['no-members']),
-    Module('bonobo.execution'),
-    Module('bonobo.execution.contexts'),
-    Module('bonobo.execution.events'),
-    Module('bonobo.execution.strategies'),
-    Module('bonobo.util'),
+    Module("bonobo", title="Bonobo"),
+    Module("bonobo.config"),
+    Module("bonobo.constants", automodule_options=["no-members"]),
+    Module("bonobo.execution"),
+    Module("bonobo.execution.contexts"),
+    Module("bonobo.execution.events"),
+    Module("bonobo.execution.strategies"),
+    Module("bonobo.util"),
 ]
 
 
 def underlined_filter(txt, chr):
-    return txt + '\n' + chr * len(txt)
+    return txt + "\n" + chr * len(txt)
 
 
 env = Environment(
     loader=DictLoader(
         {
-            'module': '''
+            "module": """
 {{ (':mod:`'~title~' <'~name~'>`') | underlined('=') }}
 
 .. currentmodule:: {{ name }}
@@ -52,15 +52,15 @@ env = Environment(
 
 .. automodule:: {{ name }}
 {% for opt in automodule_options %}   :{{ opt }}:{{ "\n" }}{% endfor %}
-    '''[
+    """[
                 1:-1
             ]
-            + '\n'
+            + "\n"
         }
     )
 )
-env.filters['underlined'] = underlined_filter
+env.filters["underlined"] = underlined_filter
 
 for module in modules:
-    with open(module.get_path(), 'w+') as f:
-        f.write(env.get_template('module').render(module.asdict()))
+    with open(module.get_path(), "w+") as f:
+        f.write(env.get_template("module").render(module.asdict()))
diff --git a/bonobo/__init__.py b/bonobo/__init__.py
index f3cdfc0..35dc5c9 100644
--- a/bonobo/__init__.py
+++ b/bonobo/__init__.py
@@ -8,7 +8,7 @@
 import sys
 
 if sys.version_info < (3, 5):
-    raise RuntimeError('Python 3.5+ is required to use Bonobo.')
+    raise RuntimeError("Python 3.5+ is required to use Bonobo.")
 
 from bonobo._api import (
     run,
@@ -65,8 +65,8 @@ def _repr_html_():
         '<div style="padding: 8px;">'
         '  <div style="float: left; width: 20px; height: 20px;">{}</div>'
         '  <pre style="white-space: nowrap; padding-left: 8px">{}</pre>'
-        '</div>'
-    ).format(__logo__, '<br/>'.join(get_versions(all=True)))
+        "</div>"
+    ).format(__logo__, "<br/>".join(get_versions(all=True)))
 
 
 del sys
diff --git a/bonobo/_api.py b/bonobo/_api.py
index 043aa77..78576aa 100644
--- a/bonobo/_api.py
+++ b/bonobo/_api.py
@@ -187,7 +187,7 @@ def get_examples_path(*pathsegments):
     import os
     import pathlib
 
-    return str(pathlib.Path(os.path.dirname(__file__), 'examples', *pathsegments))
+    return str(pathlib.Path(os.path.dirname(__file__), "examples", *pathsegments))
 
 
 @api.register
diff --git a/bonobo/_version.py b/bonobo/_version.py
index a68d2bd..63af887 100644
--- a/bonobo/_version.py
+++ b/bonobo/_version.py
@@ -1 +1 @@
-__version__ = '0.6.3'
+__version__ = "0.6.3"
diff --git a/bonobo/commands/base.py b/bonobo/commands/base.py
index b1210d3..65bdb24 100644
--- a/bonobo/commands/base.py
+++ b/bonobo/commands/base.py
@@ -4,10 +4,11 @@ import runpy
 import sys
 from contextlib import contextmanager
 
+from mondrian import humanizer
+
 import bonobo.util.environ
 from bonobo.util import get_name
 from bonobo.util.environ import get_argument_parser, parse_args
-from mondrian import humanizer
 
 
 class BaseCommand:
diff --git a/bonobo/commands/convert.py b/bonobo/commands/convert.py
index 125c4b2..d9e5c00 100644
--- a/bonobo/commands/convert.py
+++ b/bonobo/commands/convert.py
@@ -1,8 +1,9 @@
+from mondrian import humanizer
+
 import bonobo
 from bonobo.commands import BaseCommand
 from bonobo.registry import READER, WRITER, default_registry
 from bonobo.util.resolvers import _resolve_options, _resolve_transformations
-from mondrian import humanizer
 
 
 class ConvertCommand(BaseCommand):
diff --git a/bonobo/commands/init.py b/bonobo/commands/init.py
index 4342e72..d655ee2 100644
--- a/bonobo/commands/init.py
+++ b/bonobo/commands/init.py
@@ -1,9 +1,9 @@
 import os
 
 from jinja2 import Environment, FileSystemLoader
+from mondrian import humanizer
 
 from bonobo.commands import BaseCommand
-from mondrian import humanizer
 
 
 class InitCommand(BaseCommand):
@@ -31,16 +31,12 @@ class InitCommand(BaseCommand):
         with open(filename, "w+") as f:
             f.write(template.render(name=name))
 
-        print(
-            humanizer.Success(
-                "Generated {} using template {!r}.".format(filename, template_name)
-            )
-        )
+        print(humanizer.Success("Generated {} using template {!r}.".format(filename, template_name)))
 
     def create_package(self, *, filename):
         _, ext = os.path.splitext(filename)
-        if ext != '':
-            raise ValueError('Package names should not have an extension.')
+        if ext != "":
+            raise ValueError("Package names should not have an extension.")
 
         try:
             import medikit.commands
@@ -60,16 +56,16 @@ class InitCommand(BaseCommand):
         print(
             humanizer.Success(
                 'Package "{}" has been created.'.format(package_name),
-                '',
+                "",
                 "Install it...",
-                '',
+                "",
                 "    $ `pip install --editable {}`".format(filename),
-                '',
+                "",
                 "Then maybe run the example...",
-                '',
+                "",
                 "    $ `python -m {}`".format(package_name),
-                '',
-                "Enjoy!"
+                "",
+                "Enjoy!",
             )
         )
 
diff --git a/bonobo/commands/version.py b/bonobo/commands/version.py
index 0a8d9ab..ee5584b 100644
--- a/bonobo/commands/version.py
+++ b/bonobo/commands/version.py
@@ -1,6 +1,7 @@
-from bonobo.commands import BaseCommand
 from mondrian import humanizer
 
+from bonobo.commands import BaseCommand
+
 
 def get_versions(*, all=False, quiet=None):
     import bonobo
diff --git a/bonobo/config/services.py b/bonobo/config/services.py
index 1fb38cd..d9f6495 100644
--- a/bonobo/config/services.py
+++ b/bonobo/config/services.py
@@ -68,7 +68,7 @@ class Container(dict):
         if len(args) == 1:
             if len(kwargs):
                 raise ValueError(
-                    'You can either use {} with one positional argument or with keyword arguments, not both.'.format(
+                    "You can either use {} with one positional argument or with keyword arguments, not both.".format(
                         cls.__name__
                     )
                 )
diff --git a/bonobo/contrib/django/commands.py b/bonobo/contrib/django/commands.py
index 076ac23..95f6b89 100644
--- a/bonobo/contrib/django/commands.py
+++ b/bonobo/contrib/django/commands.py
@@ -60,8 +60,8 @@ class ETLCommand(BaseCommand):
 
             for i, graph in enumerate(graph_coll):
                 if not isinstance(graph, bonobo.Graph):
-                    raise ValueError('Expected a Graph instance, got {!r}.'.format(graph))
-                print(term.lightwhite('{}. {}'.format(i + 1, graph.name)))
+                    raise ValueError("Expected a Graph instance, got {!r}.".format(graph))
+                print(term.lightwhite("{}. {}".format(i + 1, graph.name)))
                 result = bonobo.run(graph, services=services, strategy=strategy)
                 results.append(result)
                 print(term.lightblack(" ... return value: " + str(result)))
diff --git a/bonobo/util/bags.py b/bonobo/util/bags.py
index e8cfeff..8e69d9b 100644
--- a/bonobo/util/bags.py
+++ b/bonobo/util/bags.py
@@ -134,7 +134,7 @@ def BagType(typename, fields, *, verbose=False, module=None):
         if type(name) is not str:
             raise TypeError("Type names and field names must be strings, got {name!r}".format(name=name))
         if not isinstance(name, str):
-            raise TypeError('Type names and field names must be strings, got {name!r}'.format(name=name))
+            raise TypeError("Type names and field names must be strings, got {name!r}".format(name=name))
         if not i:
             if not name.isidentifier():
                 raise ValueError("Type names must be valid identifiers: {name!r}".format(name=name))
diff --git a/bonobo/util/term.py b/bonobo/util/term.py
index ca7375d..d3335cb 100644
--- a/bonobo/util/term.py
+++ b/bonobo/util/term.py
@@ -1,2 +1,2 @@
 CLEAR_EOL = "\033[0K"
-MOVE_CURSOR_UP = '\033[{}A'.format
+MOVE_CURSOR_UP = "\033[{}A".format
diff --git a/docs/_templates/alabaster/__init__.py b/docs/_templates/alabaster/__init__.py
index a4bebf2..c88b2b5 100644
--- a/docs/_templates/alabaster/__init__.py
+++ b/docs/_templates/alabaster/__init__.py
@@ -12,13 +12,13 @@ def get_path():
 
 
 def update_context(app, pagename, templatename, context, doctree):
-    context['alabaster_version'] = version.__version__
+    context["alabaster_version"] = version.__version__
 
 
 def setup(app):
     # add_html_theme is new in Sphinx 1.6+
-    if hasattr(app, 'add_html_theme'):
+    if hasattr(app, "add_html_theme"):
         theme_path = os.path.abspath(os.path.dirname(__file__))
-        app.add_html_theme('alabaster', theme_path)
-    app.connect('html-page-context', update_context)
-    return {'version': version.__version__, 'parallel_read_safe': True}
+        app.add_html_theme("alabaster", theme_path)
+    app.connect("html-page-context", update_context)
+    return {"version": version.__version__, "parallel_read_safe": True}
diff --git a/docs/_templates/alabaster/_version.py b/docs/_templates/alabaster/_version.py
index 9e641f7..b74ffbe 100644
--- a/docs/_templates/alabaster/_version.py
+++ b/docs/_templates/alabaster/_version.py
@@ -1,2 +1,2 @@
 __version_info__ = (0, 7, 10)
-__version__ = '.'.join(map(str, __version_info__))
+__version__ = ".".join(map(str, __version_info__))
diff --git a/docs/conf.py b/docs/conf.py
index 73e6ec3..f9c1ead 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -7,43 +7,43 @@ import sys
 
 import bonobo
 
-sys.path.insert(0, os.path.abspath('..'))
-sys.path.insert(0, os.path.abspath('_themes'))
+sys.path.insert(0, os.path.abspath(".."))
+sys.path.insert(0, os.path.abspath("_themes"))
 
 
 # -- General configuration ------------------------------------------------
 
 extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.autosummary',
-    'sphinx.ext.doctest',
-    'sphinx.ext.intersphinx',
-    'sphinx.ext.todo',
-    'sphinx.ext.coverage',
-    'sphinx.ext.ifconfig',
-    'sphinx.ext.viewcode',
-    'sphinx.ext.graphviz',
-    'sphinx_sitemap',
+    "sphinx.ext.autodoc",
+    "sphinx.ext.autosummary",
+    "sphinx.ext.doctest",
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.todo",
+    "sphinx.ext.coverage",
+    "sphinx.ext.ifconfig",
+    "sphinx.ext.viewcode",
+    "sphinx.ext.graphviz",
+    "sphinx_sitemap",
 ]
 
-site_url = 'http://docs.bonobo-project.org/en/master/'
+site_url = "http://docs.bonobo-project.org/en/master/"
 
 # 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 = 'Bonobo'
-author = 'Romain Dorgueil'
-copyright = '2012-{}, {}'.format(datetime.datetime.now().year, author)
+project = "Bonobo"
+author = "Romain Dorgueil"
+copyright = "2012-{}, {}".format(datetime.datetime.now().year, author)
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -60,14 +60,14 @@ language = None
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This patterns also effect to html_static_path and html_extra_path
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 
-autoclass_content = 'both'
-autodoc_member_order = 'groupwise'
-autodoc_default_flags = ['members', 'undoc-members', 'show-inheritance']
+autoclass_content = "both"
+autodoc_member_order = "groupwise"
+autodoc_default_flags = ["members", "undoc-members", "show-inheritance"]
 
 add_module_names = False
-pygments_style = 'sphinx'
+pygments_style = "sphinx"
 
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = True
@@ -77,56 +77,56 @@ todo_include_todos = True
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+html_theme = "alabaster"
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
 html_theme_options = {
-    'github_user': 'python-bonobo',
-    'github_repo': 'bonobo',
-    'github_button': 'true',
-    'github_banner': 'true',
-    'show_powered_by': 'false',
-    'show_related': 'true',
+    "github_user": "python-bonobo",
+    "github_repo": "bonobo",
+    "github_button": "true",
+    "github_banner": "true",
+    "show_powered_by": "false",
+    "show_related": "true",
 }
 
 html_sidebars = {
-    'index': [
-        'sidebarlogo.html',
-        'navigation.html',
-        'localtoc.html',
-        'sidebarintro.html',
-        'sourcelink.html',
-        'searchbox.html',
-        'sidebarinfos.html',
+    "index": [
+        "sidebarlogo.html",
+        "navigation.html",
+        "localtoc.html",
+        "sidebarintro.html",
+        "sourcelink.html",
+        "searchbox.html",
+        "sidebarinfos.html",
     ],
-    '**': [
-        'sidebarlogo.html',
-        'navigation.html',
-        'localtoc.html',
-        'relations.html',
-        'sourcelink.html',
-        'searchbox.html',
-        'sidebarinfos.html',
+    "**": [
+        "sidebarlogo.html",
+        "navigation.html",
+        "localtoc.html",
+        "relations.html",
+        "sourcelink.html",
+        "searchbox.html",
+        "sidebarinfos.html",
     ],
 }
 
-html_theme_path = ['_themes']
-html_additional_pages = {'index': 'index.html'}
+html_theme_path = ["_themes"]
+html_additional_pages = {"index": "index.html"}
 
 # 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"]
 html_show_sphinx = False
 
-graphviz_output_format = 'svg'
+graphviz_output_format = "svg"
 
 # -- Options for HTMLHelp output ------------------------------------------
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'Bonobodoc'
+htmlhelp_basename = "Bonobodoc"
 
 # -- Options for LaTeX output ---------------------------------------------
 
@@ -148,13 +148,13 @@ latex_elements = {
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
-latex_documents = [(master_doc, 'Bonobo.tex', 'Bonobo Documentation', 'Romain Dorgueil', 'manual')]
+latex_documents = [(master_doc, "Bonobo.tex", "Bonobo Documentation", "Romain Dorgueil", "manual")]
 
 # -- Options for manual page output ---------------------------------------
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [(master_doc, 'bonobo', 'Bonobo Documentation', [author], 1)]
+man_pages = [(master_doc, "bonobo", "Bonobo Documentation", [author], 1)]
 
 # -- Options for Texinfo output -------------------------------------------
 
@@ -164,12 +164,12 @@ man_pages = [(master_doc, 'bonobo', 'Bonobo Documentation', [author], 1)]
 texinfo_documents = [
     (
         master_doc,
-        'Bonobo',
-        'Bonobo Documentation',
+        "Bonobo",
+        "Bonobo Documentation",
         author,
-        'Bonobo',
-        'One line description of project.',
-        'Miscellaneous',
+        "Bonobo",
+        "One line description of project.",
+        "Miscellaneous",
     )
 ]
 
@@ -191,14 +191,14 @@ epub_copyright = copyright
 # epub_uid = ''
 
 # A list of files that should not be packed into the epub file.
-epub_exclude_files = ['search.html']
+epub_exclude_files = ["search.html"]
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    'django': ('https://docs.djangoproject.com/en/2.0/', 'https://docs.djangoproject.com/en/2.0/_objects/'),
-    'fs': ('https://docs.pyfilesystem.org/en/latest/', None),
-    'python': ('https://docs.python.org/3', None),
-    'requests': ('http://docs.python-requests.org/en/master/', None),
+    "django": ("https://docs.djangoproject.com/en/2.0/", "https://docs.djangoproject.com/en/2.0/_objects/"),
+    "fs": ("https://docs.pyfilesystem.org/en/latest/", None),
+    "python": ("https://docs.python.org/3", None),
+    "requests": ("http://docs.python-requests.org/en/master/", None),
 }
 
 rst_epilog = """
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 366ecf1..7b03457 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -20,7 +20,6 @@ jinja2==2.10
 markupsafe==1.0
 more-itertools==4.3.0
 packaging==17.1
-pathlib2==2.3.2
 pluggy==0.7.1
 poyo==0.4.1
 py==1.5.4
diff --git a/requirements-docker.txt b/requirements-docker.txt
index 389588d..b5da1e0 100644
--- a/requirements-docker.txt
+++ b/requirements-docker.txt
@@ -23,7 +23,6 @@ requests==2.19.1
 semantic-version==2.6.0
 six==1.11.0
 stevedore==1.29.0
-typing==3.6.4
 unidecode==1.0.22
 urllib3==1.23
 websocket-client==0.48.0
diff --git a/requirements-sqlalchemy.txt b/requirements-sqlalchemy.txt
index d6c7845..389f976 100644
--- a/requirements-sqlalchemy.txt
+++ b/requirements-sqlalchemy.txt
@@ -21,7 +21,6 @@ requests==2.19.1
 six==1.11.0
 sqlalchemy==1.2.10
 stevedore==1.29.0
-typing==3.6.4
 unidecode==1.0.22
 urllib3==1.23
 whistle==1.0.1
diff --git a/requirements.txt b/requirements.txt
index a3dc418..51127fd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,6 @@ pytz==2018.5
 requests==2.19.1
 six==1.11.0
 stevedore==1.29.0
-typing==3.6.4
 unidecode==1.0.22
 urllib3==1.23
 whistle==1.0.1
diff --git a/setup.py b/setup.py
index daeab3e..18b166a 100644
--- a/setup.py
+++ b/setup.py
@@ -2,10 +2,11 @@
 # All changes will be overriden.
 # Edit Projectfile and run “make update” (or “medikit update”) to regenerate.
 
-from setuptools import setup, find_packages
 from codecs import open
 from os import path
 
+from setuptools import find_packages, setup
+
 here = path.abspath(path.dirname(__file__))
 
 # Py3 compatibility hacks, borrowed from IPython.
@@ -20,76 +21,88 @@ except NameError:
 
 # Get the long description from the README file
 try:
-    with open(path.join(here, 'README.rst'), encoding='utf-8') as f:
+    with open(path.join(here, "README.rst"), encoding="utf-8") as f:
         long_description = f.read()
 except:
-    long_description = ''
+    long_description = ""
 
 # Get the classifiers from the classifiers file
-tolines = lambda c: list(filter(None, map(lambda s: s.strip(), c.split('\n'))))
+tolines = lambda c: list(filter(None, map(lambda s: s.strip(), c.split("\n"))))
 try:
-    with open(path.join(here, 'classifiers.txt'), encoding='utf-8') as f:
+    with open(path.join(here, "classifiers.txt"), encoding="utf-8") as f:
         classifiers = tolines(f.read())
 except:
     classifiers = []
 
 version_ns = {}
 try:
-    execfile(path.join(here, 'bonobo/_version.py'), version_ns)
+    execfile(path.join(here, "bonobo/_version.py"), version_ns)
 except EnvironmentError:
-    version = 'dev'
+    version = "dev"
 else:
-    version = version_ns.get('__version__', 'dev')
+    version = version_ns.get("__version__", "dev")
 
 setup(
-    author='Romain Dorgueil',
-    author_email='romain@dorgueil.net',
-    data_files=[('share/jupyter/nbextensions/bonobo-jupyter', [
-        'bonobo/contrib/jupyter/static/extension.js',
-        'bonobo/contrib/jupyter/static/index.js',
-        'bonobo/contrib/jupyter/static/index.js.map'
-    ])],
-    description=(
-        'Bonobo, a simple, modern and atomic extract-transform-load toolkit for '
-        'python 3.5+.'),
-    license='Apache License, Version 2.0',
-    name='bonobo',
-    python_requires='>=3.5',
+    author="Romain Dorgueil",
+    author_email="romain@dorgueil.net",
+    data_files=[
+        (
+            "share/jupyter/nbextensions/bonobo-jupyter",
+            [
+                "bonobo/contrib/jupyter/static/extension.js",
+                "bonobo/contrib/jupyter/static/index.js",
+                "bonobo/contrib/jupyter/static/index.js.map",
+            ],
+        )
+    ],
+    description=("Bonobo, a simple, modern and atomic extract-transform-load toolkit for " "python 3.5+."),
+    license="Apache License, Version 2.0",
+    name="bonobo",
+    python_requires=">=3.5",
     version=version,
     long_description=long_description,
     classifiers=classifiers,
-    packages=find_packages(exclude=['ez_setup', 'example', 'test']),
+    packages=find_packages(exclude=["ez_setup", "example", "test"]),
     include_package_data=True,
     install_requires=[
-        'cached-property (~= 1.4)', 'fs (~= 2.0)', 'graphviz (>= 0.8, < 0.9)',
-        'jinja2 (~= 2.9)', 'mondrian (~= 0.8)', 'packaging (~= 17.0)',
-        'psutil (~= 5.4)', 'python-slugify (~= 1.2.0)', 'requests (~= 2.0)',
-        'stevedore (~= 1.27)', 'whistle (~= 1.0)'
+        "cached-property (~= 1.4)",
+        "fs (~= 2.0)",
+        "graphviz (>= 0.8, < 0.9)",
+        "jinja2 (~= 2.9)",
+        "mondrian (~= 0.8)",
+        "packaging (~= 17.0)",
+        "psutil (~= 5.4)",
+        "python-slugify (~= 1.2.0)",
+        "requests (~= 2.0)",
+        "stevedore (~= 1.27)",
+        "whistle (~= 1.0)",
     ],
     extras_require={
-        'dev': [
-            'cookiecutter (>= 1.5, < 1.6)', 'coverage (~= 4.4)',
-            'pytest (~= 3.4)', 'pytest-cov (~= 2.5)',
-            'pytest-timeout (>= 1, < 2)', 'sphinx (~= 1.7)',
-            'sphinx-sitemap (>= 0.2, < 0.3)'
+        "dev": [
+            "cookiecutter (>= 1.5, < 1.6)",
+            "coverage (~= 4.4)",
+            "pytest (~= 3.4)",
+            "pytest-cov (~= 2.5)",
+            "pytest-timeout (>= 1, < 2)",
+            "sphinx (~= 1.7)",
+            "sphinx-sitemap (>= 0.2, < 0.3)",
         ],
-        'docker': ['bonobo-docker (~= 0.6.0a1)'],
-        'jupyter': ['ipywidgets (~= 6.0)', 'jupyter (~= 1.0)'],
-        'sqlalchemy': ['bonobo-sqlalchemy (~= 0.6.0a1)']
+        "docker": ["bonobo-docker (~= 0.6.0a1)"],
+        "jupyter": ["ipywidgets (~= 6.0)", "jupyter (~= 1.0)"],
+        "sqlalchemy": ["bonobo-sqlalchemy (~= 0.6.0a1)"],
     },
     entry_points={
-        'bonobo.commands': [
-            'convert = bonobo.commands.convert:ConvertCommand',
-            'download = bonobo.commands.download:DownloadCommand',
-            'examples = bonobo.commands.examples:ExamplesCommand',
-            'init = bonobo.commands.init:InitCommand',
-            'inspect = bonobo.commands.inspect:InspectCommand',
-            'run = bonobo.commands.run:RunCommand',
-            'version = bonobo.commands.version:VersionCommand'
+        "bonobo.commands": [
+            "convert = bonobo.commands.convert:ConvertCommand",
+            "download = bonobo.commands.download:DownloadCommand",
+            "examples = bonobo.commands.examples:ExamplesCommand",
+            "init = bonobo.commands.init:InitCommand",
+            "inspect = bonobo.commands.inspect:InspectCommand",
+            "run = bonobo.commands.run:RunCommand",
+            "version = bonobo.commands.version:VersionCommand",
         ],
-        'console_scripts': ['bonobo = bonobo.commands:entrypoint']
+        "console_scripts": ["bonobo = bonobo.commands:entrypoint"],
     },
-    url='https://www.bonobo-project.org/',
-    download_url='https://github.com/python-bonobo/bonobo/tarball/{version}'.
-    format(version=version),
+    url="https://www.bonobo-project.org/",
+    download_url="https://github.com/python-bonobo/bonobo/tarball/{version}".format(version=version),
 )
diff --git a/tests/config/test_services.py b/tests/config/test_services.py
index 20b0ee2..a86e639 100644
--- a/tests/config/test_services.py
+++ b/tests/config/test_services.py
@@ -131,20 +131,20 @@ def test_requires():
 
 
 def test_constructor():
-    c1 = Container(foo='foo', bar='bar')
+    c1 = Container(foo="foo", bar="bar")
     assert 2 == len(c1)
 
-    c2 = Container({'foo': 'foo', 'bar': 'bar'})
+    c2 = Container({"foo": "foo", "bar": "bar"})
     assert 2 == len(c2)
 
-    assert c1['foo'] == c2['foo']
-    assert c1['bar'] == c2['bar']
+    assert c1["foo"] == c2["foo"]
+    assert c1["bar"] == c2["bar"]
 
     with pytest.raises(ValueError):
-        Container({'bar': 'bar'}, foo='foo')
+        Container({"bar": "bar"}, foo="foo")
 
 
-@pytest.mark.parametrize('services', [None, {}])
+@pytest.mark.parametrize("services", [None, {}])
 def test_create_container_empty_values(services):
     c = create_container(services)
     assert len(c) == 2
diff --git a/tests/nodes/io/test_csv.py b/tests/nodes/io/test_csv.py
index 0f853a3..3173768 100644
--- a/tests/nodes/io/test_csv.py
+++ b/tests/nodes/io/test_csv.py
@@ -63,9 +63,9 @@ class CsvReaderTest(Csv, ReaderTest, TestCase):
     def test_output_type(self, context):
         context.write_sync(EMPTY)
         context.stop()
-        self.check_output(context, prepend=[('id', 'name')])
+        self.check_output(context, prepend=[("id", "name")])
 
-    @incontext(output_fields=('x', 'y'), skip=1)
+    @incontext(output_fields=("x", "y"), skip=1)
     def test_output_fields(self, context):
         context.write_sync(EMPTY)
         context.stop()
@@ -103,7 +103,7 @@ class CsvWriterTest(Csv, WriterTest, TestCase):
         context.write_sync((L1, L2), (L3, L4))
         context.stop()
 
-        assert self.readlines() == ('a,hey', 'b,bee', 'c,see', 'd,dee')
+        assert self.readlines() == ("a,hey", "b,bee", "c,see", "d,dee")
 
     @incontext()
     def test_nofields_multiple_args_length_mismatch(self, context):