def webdoc(arg=None, stable=None):
 stable = (release if (stable is None) else stable)
 url_or_error = _generate_url(arg, stable)
 if isinstance(url_or_error, ValueError):
  raise url_or_error
 webbrowser.open(url_or_error)
 return None

def webdoc ( arg = None , stable = None ) : stable = ( release if ( stable is None ) else stable ) url_or_error = _generate_url ( arg , stable ) if isinstance ( url_or_error , ValueError ) : raise url_or_error webbrowser . open ( url_or_error ) return None
opens a browser and displays online documentation parameters arg .