code: def main():
      
      notebook = {
          'cells': [
              {
                  'cell_type': 'markdown',
                  'metadata': {},
                  'source': [
                      '# cvloop functions\n\n',
                      'This notebook shows an overview over all cvloop ',
                      'functions provided in the [`cvloop.functions` module](',
                      'https://github.com/shoeffner/cvloop/blob/',
                      'develop/cvloop/functions.py).'
                  ]
              },
          ],
          'nbformat': 4,
          'nbformat_minor': 1,
          'metadata': {
              'language_info': {
                  'codemirror_mode': {
                      'name': 'ipython',
                      'version': 3
                  },
                  'file_extension': '.py',
                  'mimetype': 'text/x-python',
                  'name': 'python',
                  'nbconvert_exporter': 'python',
                  'pygments_lexer': 'ipython3',
                  'version': '3.5.1+'
              }
          }
      }
      classes = list_classes('cvloop.functions')
      functions = list_functions('cvloop.functions')
  
      line_numbers_cls = get_linenumbers(classes, cvloop.functions,
                                         'class {}:\n')
      line_numbers = get_linenumbers(functions, cvloop.functions)
  
      for cls in classes:
          line_number = line_numbers_cls[cls]
          notebook['cells'].append(create_description_cell(cls, line_number))
          notebook['cells'].append(create_code_cell(cls, isclass=True))
  
      for func in functions:
          line_number = line_numbers[func]
          notebook['cells'].append(create_description_cell(func, line_number))
          notebook['cells'].append(create_code_cell(func))
  
      with open(sys.argv[1], 'w') as nfile:
          json.dump(notebook, nfile, indent=4)
docs: Main function creates the cvloop.functions example notebook.