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45 lines
1.2 KiB
Python
Executable file
45 lines
1.2 KiB
Python
Executable file
#! /usr/bin/env python3
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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 re
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import sys
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def main():
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prog = re.compile('^(.*)=([-+]?[0-9]+)')
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def makekey(item, prog=prog):
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match = prog.match(item)
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if match:
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var, num = match.groups()
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return int(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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for line in sys.stdin:
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items = sorted(makekey(item) for item in line.split())
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for num, var in items:
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print("%s=%s" % (var, num), end=' ')
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print()
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main()
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