Python stack implementation method

Python stack implementation method

This article describes how to implement the stack in Python. Share it with you for your reference. The specific implementation method is as follows:

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#! /Usr/bin/env python # Define a list to simulate stacks Stack = [] # Stack: The append () function of the call list is added to the end of the list. If strip () does not have a parameter, spaces at the beginning and end are removed. Def pushit (): Stack. append (raw_input ('enter new string: '). strip ()) # The pop () function is used for the output stack. Def popit (): If len (stack) = 0: Print 'cannot pop from an empty stack! ' Else: Print 'removed [', stack. pop (),']' # Editing Stack Def viewstack (): Print stack # CMDs is used as a dictionary CMDs = {'U': pushit, 'O': popit, 'V': viewstack} # Pr is the prompt character Def showmenu (): Pr = """ P (U) sh P (O) p (V) iew (Q) uit Enter choice :""" While True: While True: Try: # Remove spaces with strip () and convert the first character to lowercase letters. Choice = raw_input (pr). strip () [0]. lower () Handle T (EOFError, KeyboardInterrupt, IndexError ): Choice = 'Q' Print '\ nYou picked: [% s]' % choice If choice not in 'uovq ': Print 'invalid option, try again' Else: Break # CMDs [] corresponds to the corresponding value from the dictionary based on the input choice. For example, if the input u is used, the value is pushit from the dictionary and pushit () is executed for Stack import. If choice = 'q ': Break CMDs [choice] () # Determine whether the file is in, rather than being called If _ name _ = '_ main __': Showmenu ()

I hope this article will help you with Python programming.