47-使用列表进行模拟栈
stack = []
def push_it():
item = input('item to push: ')
stack.append(item)
def pop_it():
if stack:
print("from stack popped %s" % stack.pop())
def view_it():
print(stack)
def show_menu():
cmds = {'0': push_it, '1': pop_it, '2': view_it} # 将函数存入字典
prompt = """(0) push it
(1) pop it
(2) view it
(3) exit
Please input your choice(0/1/2/3): """
while True:
# input()得到字符串,用strip()去除两端空白,再取下标为0的字符
choice = input(prompt).strip()[0]
if choice not in '0123':
print('Invalid input. Try again.')
continue
if choice == '3':
break
cmds[choice]()
if __name__ == '__main__':
show_menu()