Only use sphinx_rtd_theme locally

docs/conf.py

@@ -98,14 +98,17 @@ pygments_style = 'sphinx'
 
 # -- Options for HTML output ----------------------------------------------
 
-import sphinx_rtd_theme
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
 
-# The theme to use for HTML and HTML Help pages.  See the documentation for
-# a list of builtin themes.
-html_theme = "sphinx_rtd_theme"
+if not on_rtd:
+    import sphinx_rtd_theme
 
-# Add any paths that contain custom themes here, relative to this directory.
-html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+    # The theme to use for HTML and HTML Help pages.  See the documentation for
+    # a list of builtin themes.
+    html_theme = "sphinx_rtd_theme"
+
+    # Add any paths that contain custom themes here, relative to this directory.
+    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 # 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