python 文件排序_使用Python对文本文件进行排序

import sysfrom functools import partialfrom heapq import mergefrom tempfile import TemporaryFile# define sorting criteriadef second_column(line, default=float("inf")):

try:

return int(line.split(";", 2)[1]) # use int() for numeric sort

except (IndexError, ValueError):

return default # a key for non-integer or non-existent 2nd column# sort lines in small batches, write intermediate results to temporary filessorted_files = []nbytes = 1 << 20 # load around nbytes bytes at a timefor lines in iter(partial(sys.stdin.readlines, nbytes), []):

lines.sort(key=second_column) # sort current batch

f = TemporaryFile("w+")

f.writelines(lines)

f.seek(0) # rewind

sorted_files.append(f)# merge & write the resultsys.stdout.writelines(merge(*sorted_files, key=second_column))# clean upfor f in sorted_files:

f.close() # temporary file is deleted when it closesiters = [((second_column(line), line) for line in file)

for file in sorted_files] # note: this makes the sort unstablesorted_lines = (line for _, line in merge(*iters))sys.stdout.writelines(sorted_lines)

用法：$ python sort-k2-n.py < input.txt > output.txt

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