如何不断提示用户输入？

Question

I'm writing a function that prompts for input and then returns different results based on the input and then asks for input again. I've got it returning the correct values, but I'm not sure how to make it prompt for input again.

Here's the actual code of the function:

def interact():
    command = raw_input('Command:')
    command = command.split(' ')
    if command[0] == 'i':
        bike_name =  command[1] + ' ' + command[2]
        return get_product_id(products, bike_name)
    if command [0] == 'n':
        return get_product_name(products, command[1])
    if command[0] == 'c':
        return compute_cost(products, part, command[1])
    if command[0] == 'p':
        return get_parts(products, command[1])

In each line with return in it, it is simply calling up a previously defined function. The products and part are dictionaries, defined previously.

I can only use the builtin functions.

Answer 1

You've done most of the work, you just need this:

while True:
    print interact()

Answer 2

I would do it with a while loop. Like This:

while True:
    com = raw_input('Command:').split()
    if len(com) == 0:
        break
    elif com[0] == 'i':
        bike_name =  command[1] + ' ' + command[2]
        return get_product_id(products, bike_name)

Answer 3

There is no need to take so much pain and write your own command line interpreter. Look at this: http://docs.python.org/2/library/cmd.html

Answer 4

一种方法是将其放入 while 循环中，然后还检查是否有退出输入中断。

Answer 5

Call the method inside an (end-less) loop:

while True:
   some_method()