the increment has been calculatedit' added to the value of x_position at vand the result is stored in the dictionary' x_position because this is medium-speed alienits position shifts two units to the rightoriginal -position new -position this technique is pretty coolby changing one value in the alien' dictionaryyou can change the overall behavior of the alien for exampleto turn this medium-speed alien into fast alienyou would add the linealien_ ['speed'fast the ifelifelse block would then assign larger value to x_increment the next time the code runs removing key-value pairs when you no longer need piece of information that' stored in dictionaryyou can use the del statement to completely remove key-value pair all del needs is the name of the dictionary and the key that you want to remove for examplelet' remove the key 'pointsfrom the alien_ dictionary along with its valuealien_ {'color''green''points' print(alien_ del alien_ ['points'print(alien_ the line at tells python to delete the key 'pointsfrom the dictionary alien_ and to remove the value associated with that key as well the output shows that the key 'pointsand its value of are deleted from the dictionarybut the rest of the dictionary is unaffected{'color''green''points' {'color''green'note be aware that the deleted key-value pair is removed permanently dictionary of similar objects the previous example involved storing different kinds of information about one objectan alien in game you can also use dictionary to store one kind of information about many objects for examplesay you want to poll