parameters: (self)
docstring: Center the page vertically.
  
          Args:
              None.
  
          Returns:
              Nothing.
docstring_summary: Center the page vertically.
docstring_tokens: Center the page vertically .
function: def center_vertically(self):
          """
          Center the page vertically.
  
          Args:
              None.
  
          Returns:
              Nothing.
  
          """
          self.print_options_changed = True
          self.vcenter = 1
function_tokens: def center_vertically ( self ) : self . print_options_changed = True self . vcenter = 1