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