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copied!<p>Use parseIntSet from <a href="http://thoughtsbyclayg.blogspot.com/2008/10/parsing-list-of-numbers-in-python.html" rel="noreferrer">here</a></p> <p>I also like the pyparsing implementation in the comments at the end.</p> <p>The parseIntSet has been modified here to handle "<3"-type entries and to only spit out the invalid strings if there are any.</p> <pre><code>#! /usr/local/bin/python import sys import os # return a set of selected values when a string in the form: # 1-4,6 # would return: # 1,2,3,4,6 # as expected... def parseIntSet(nputstr=""): selection = set() invalid = set() # tokens are comma seperated values tokens = [x.strip() for x in nputstr.split(',')] for i in tokens: if len(i) > 0: if i[:1] == "<": i = "1-%s"%(i[1:]) try: # typically tokens are plain old integers selection.add(int(i)) except: # if not, then it might be a range try: token = [int(k.strip()) for k in i.split('-')] if len(token) > 1: token.sort() # we have items seperated by a dash # try to build a valid range first = token[0] last = token[len(token)-1] for x in range(first, last+1): selection.add(x) except: # not an int and not a range... invalid.add(i) # Report invalid tokens before returning valid selection if len(invalid) > 0: print "Invalid set: " + str(invalid) return selection # end parseIntSet print 'Generate a list of selected items!' nputstr = raw_input('Enter a list of items: ') selection = parseIntSet(nputstr) print 'Your selection is: ' print str(selection) </code></pre> <p>And here's the output from the sample run:</p> <pre><code>$ python qq.py Generate a list of selected items! Enter a list of items: <3, 45, 46, 48-51, 77 Your selection is: set([1, 2, 3, 45, 46, 77, 48, 49, 50, 51]) </code></pre>

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