Python Simulation queues and stacks (list exercise)
# # queuehammer define in queue functiondef enQ python'use list as a queue'#define a void list as a void queuequeue binr python'use list as a queue'#define a void list as a void queuequeue = [] # QUR (): queue.append (raw) _ input ('Enter New String:'). Strip () # define out queue functiondef deQ (): # judge queue whether viod if len (queue) = = 0: print ('Can not pop from an empty queuetries') Else: print ('Removed', queue.pop (0)) # define show queue functiondef viewQ (): print (queue) # define a dictionary to chose opration functioncmds 'v':viewQ} # define a funtion to show menudef showMenu (): pr =''(E) nqueue (D) equeue (V) iew (Q) uit Enter choice:''' # double while circle make program always run while True: while True: try: # use to print menu information and get valid choice number (no space, just one bit Lower) choice = raw_input (pr). Strip () [0] .lower () except (EOFError,KeyboardInterrupt,IndexError): # if get an invalid value,return'q' choice ='q' print ('You picked:% s'% choice) if choice not in 'devq': print (' Invalid option) Try customers') Else: break if choice = = 'qcow: break # call functions by dictionary cmds [choice] () # main functionif _ _ name__ = =' _ main__': showMenu () # # stack# #! / usr/bin/env python'this program use list as a stack'stack = [] def pushit (): 'input stack' stack.append (raw_input (' Enter New Strings:'). Strip () def popit (): 'output stack' if len (stack) = = 0: print (' Can not pop from an empty stackbacks') Else: print ('removed [', stack.pop (),']') def viewStack (): print (stack) CMDs = {'upright: pushit,' oval: popit While True: viewStack} def showMenu (): pr =''p (U) sh p (O) p (V) iew (Q) uit Enter Choice:''while True: while True: try: choice = raw_input (pr). Strip () [0] .lower () print (choice) except (EOFError.KeyboardInterrupt) IndexError): choice ='q' print ('you picked:% s'% choice) if choice not in' uovq': print ('Invalid option, try again') else: break if choice = =' q': break CMDs [choice] () if _ _ name__ = ='_ main__': showMenu ()
