method description screen getcanvas(return the canvas of this turtlescreen example (for screen instance named screen)cv screen getcanvas(cv screen getshapes(return list of names of all currently available turtle shapes example (for turtlescreen instance named screen)screen getshapes(['arrow''blank''circle''turtle'screen listen(xdummy=noneydummy=noneset focus on turtlescreen (in order to collect key-eventsdummy arguments are provided in order to be able to pass listen to the onclick method example (for turtlescreen instance named screen)screen listen(screen mode(mode=noneset turtle-mode ('standard''logoor 'world'and perform reset optional argumentmode on of the strings 'standard''logoor 'worldmode 'standardis compatible with turtle py mode 'logois compatible with most logo-turtle-graphics mode 'worlduses userdefined 'worldcoordinates*attention*in this mode angles appear distorted if / unit-ratio doesn' equal if mode is not givenreturn the current mode mode initial turtle heading positive angles 'standardto the right (eastcounterclockwise 'logoupward (northclockwise examplesmode('logo'resets turtle heading to north mode('logothis copy belongs to 'acha