stact.py

__author__ = 'ND'
stack = []
def pushit():
    stack.append(raw_input('Enter new string').strip())
def popit():
    if len(stack) == 0:
        print 'stact is empty'
    else:
        print 'Removed [', stack.pop(), ']'
def viewstack():
    print stack
CMDs = {'u': pushit, 'o': popit, 'v': 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()
                except (EOFError,KeyboardInterrupt,IndexError):
                    choice = 'q'
                print '\nYou 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()