Showing content from http://svn.python.org/projects/python/branches/r23a2-branch/Demo/comparisons/sortingtest.py below:
#! /usr/bin/env python # 2) Sorting Test # # Sort an input file that consists of lines like this # # var1=23 other=14 ditto=23 fred=2 # # such that each output line is sorted WRT to the number. Order # of output lines does not change. Resolve collisions using the # variable name. e.g. # # fred=2 other=14 ditto=23 var1=23 # # Lines may be up to several kilobytes in length and contain # zillions of variables. # This implementation: # - Reads stdin, writes stdout # - Uses any amount of whitespace to separate fields # - Allows signed numbers # - Treats illegally formatted fields as field=0 # - Outputs the sorted fields with exactly one space between them # - Handles blank input lines correctly import regex import string import sys def main(): prog = regex.compile('^\(.*\)=\([-+]?[0-9]+\)') def makekey(item, prog=prog): if prog.match(item) >= 0: var, num = prog.group(1, 2) return string.atoi(num), var else: # Bad input -- pretend it's a var with value 0 return 0, item while 1: line = sys.stdin.readline() if not line: break items = string.split(line) items = map(makekey, items) items.sort() for num, var in items: print "%s=%s" % (var, num), print main()
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