diff --git a/docs/conf.py b/docs/conf.py
index 15a8bcb..c7aa519 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -16,21 +16,21 @@
 import os
 import sys
 
-sys.path.insert(0, os.path.abspath(r'..'))
+sys.path.insert(0, os.path.abspath(r".."))
 
 
 from isogeotoxlsx.__about__ import __title__, __version__ as VERSION
 from isogeotoxlsx import *
 
 # -- Build environment -----------------------------------------------------
-on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+on_rtd = os.environ.get("READTHEDOCS", None) == "True"
 
 
 # -- Project information -----------------------------------------------------
 
 project = __title__
-author = 'Isogeo'
-copyright = u'2019 - {0}, {1}'.format(date.today().year, author)
+author = "Isogeo"
+copyright = "2019 - {0}, {1}".format(date.today().year, author)
 
 # The short X.Y version
 version = VERSION
@@ -47,22 +47,19 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.viewcode',
-]
+extensions = ["sphinx.ext.autodoc", "sphinx.ext.viewcode"]
 
 # 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", ".md"]
 
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -74,11 +71,21 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = ["_build", "*.csv", "samples/*", "Thumbs.db", ".DS_Store",
-                    "*env*", "libs/*", "*.xml", "input/*", "output/*"]
+exclude_patterns = [
+    "_build",
+    "*.csv",
+    "samples/*",
+    "Thumbs.db",
+    ".DS_Store",
+    "*env*",
+    "libs/*",
+    "*.xml",
+    "input/*",
+    "output/*",
+]
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = "sphinx"
 
 
 # -- Options for HTML output -------------------------------------------------
@@ -86,7 +93,7 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'default'
+html_theme = "default"
 
 # 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
@@ -97,7 +104,7 @@
 # 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.
@@ -113,7 +120,7 @@
 # -- Options for HTMLHelp output ---------------------------------------------
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'IsogeoXlsxExporterdoc'
+htmlhelp_basename = "IsogeoXlsxExporterdoc"
 
 
 # -- Options for LaTeX output ------------------------------------------------
@@ -122,15 +129,12 @@
     # 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',
@@ -140,8 +144,13 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, 'Isogeo-XlsxExporter.tex', 'Isogeo - XLSX Exporter Documentation',
-     'Isogeo', 'manual'),
+    (
+        master_doc,
+        "Isogeo-XlsxExporter.tex",
+        "Isogeo - XLSX Exporter Documentation",
+        "Isogeo",
+        "manual",
+    )
 ]
 
 
@@ -150,8 +159,13 @@
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    (master_doc, 'isogeo-xmltoolbelt', 'Isogeo - XLSX Exporter Documentation',
-     [author], 1)
+    (
+        master_doc,
+        "isogeo-export-xlsx",
+        "Isogeo - XLSX Exporter Documentation",
+        [author],
+        1,
+    )
 ]
 
 
@@ -161,9 +175,15 @@
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, 'Isogeo-XlsxExporter', 'Isogeo - XLSX Exporter Documentation',
-     author, 'Isogeo-XlsxExporter', 'Scripting toolbox to handle import of external geographic metadata',
-     'Miscellaneous'),
+    (
+        master_doc,
+        "Isogeo-XlsxExporter",
+        "Isogeo - XLSX Exporter Documentation",
+        author,
+        "Isogeo-XlsxExporter",
+        "Scripting toolbox to handle import of external geographic metadata",
+        "Miscellaneous",
+    )
 ]
 
 
@@ -182,7 +202,7 @@
 # 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"]
 
 
 # -- Extension configuration -------------------------------------------------
@@ -192,21 +212,20 @@
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = True
 
+
 # -- Options for Sphinx API doc ----------------------------------------------
 # run api doc
 def run_apidoc(_):
     from sphinx.ext.apidoc import main
 
     cur_dir = os.path.normpath(os.path.dirname(__file__))
-    output_path = os.path.join(cur_dir, '_apidoc')
+    output_path = os.path.join(cur_dir, "_apidoc")
     modules = os.path.normpath(os.path.join(cur_dir, "../isogeotoxlsx/"))
-    exclusions = [
-        '../input',
-        '../output',
-        '/tests',
-    ]
-    main(['-e', '-f', '-M', '-o', output_path, modules] + exclusions)
+    exclusions = ["../input", "../output", "/tests"]
+    main(["-e", "-f", "-M", "-o", output_path, modules] + exclusions)
+
 
 # launch setup
 def setup(app):
-    app.connect('builder-inited', run_apidoc)
+    app.connect("builder-inited", run_apidoc)
+
diff --git a/isogeotoxlsx/__init__.py b/isogeotoxlsx/__init__.py
index 126b08c..e3e2fe9 100644
--- a/isogeotoxlsx/__init__.py
+++ b/isogeotoxlsx/__init__.py
@@ -2,7 +2,7 @@
 #! python3
 
 """
-    This package is used to export Isogeo metadata into Excel workbooks usng the Isogeo Python SDK and OpenPyXl.
+    This package is used to export Isogeo metadata into Excel workbooks using the Isogeo Python SDK and OpenPyXl.
 """
 
 # submodules
@@ -10,7 +10,7 @@
 from .isogeo2xlsx import Isogeo2xlsx  # noqa: F401
 
 # subpackages
-from .matrix import *  # noqa: F401
-from .utils import *  # noqa: F401
+from .matrix import *  # noqa: F401,F403
+from .utils import *  # noqa: F401,F403
 
 VERSION = __version__