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I don't know which one I need actually because I am relatively new to python. What my goal is to have a stand alone script to run multiple buffers based on user input. For example, I would like to ask the user how many buffers and then ask them what those buffers are.

How many buffers do you have? 3 What distances would you like to buffer? 50, 150, 250

I want to get all the input information before running the buffer tool. I'm guessing I need some type of loop.

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2 Answers 2

There is a built-in script tool that does exactly this: Multiple Ring Buffer

Screenshot of the Multiple Ring Buffer tool dialog

You can right-click it and go to edit to see the source Python script for its implementation.

If you want to roll your own (as a script tool), the key to the implementation is a multi-value parameter (of type double) for the distances, which at runtime is passed as a semicolon-delimited string argument, which you can then split up into a Python list object using str.split(), which you can then loop over using a for statement and create the buffers iteratively.

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Take a look at the argparse module (which you can download separately if you're not using Python 2.7). Specifically the nargs keyword, which automatically puts your data into a list. For example:

import argparse

parser = argparse.ArgumentParser(description='Make some buffers')
parser.add_argument('buffers', metavar='distance', type=int, nargs='+',
                    help='Buffer distances')

args = parser.parse_args()
print "Number of buffers: %i" % len(args.buffers)
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Note you can do similar with the optparse module, which is native to 2.6, but it's more complex. –  om_henners Oct 10 '12 at 2:04
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