Python, continuously prompting for user input

问题:

This is homework so I'm just after some guidance.

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, just 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, products and part are dictionaries, defined previously.

I can only use the builtin functions

Any help is greatly appreciated!

回答1:

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)

回答2:

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

while True:
    print interact()

回答3:

One way is to put it in a while loop, and then also check for an exit input to break out.

回答4:

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

回答5:

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

while True:
   some_method()