Temporary disabled String Formatting part. Get rid of "conversion".

doc/conf.py

@@ -25,7 +25,7 @@ import sys, os
 
 # 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.mathjax']
+extensions = ['sphinx.ext.ifconfig']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['-templates']
@@ -91,7 +91,7 @@ pygments_style = 'sphinx'
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
+html_theme = 'sphinxdoc'
 
 # 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

doc/index.rst

@@ -11,7 +11,7 @@ Contents:
 .. toctree::
    :maxdepth: 2
 
-
+   string
 
 Indices and tables
 ==================