Question

这是对我之前的问题（text file reduction with randomization in Python）的跟进。正在修改以运行多次减少，但只有第一个输出文件包含减少，以下3个文件的大小为零。这一定是显而易见的，我没有看到......

#!/usr/bin/env python
import random
import sys
from itertools import chain, groupby

def choose_random(iterator, fraction, random=random.random):
    """Lazy analog of:

        L = list(iterator)
        k = int(len(L) * fraction + .5) or 1 # get at least one
        result = random.sample(L, k)

    Note: this function doesn't randomize the order of elements
          that would require to keep selected elements in memory
          and number of output elements is not exactly k
    """
    # always yield at least one item if input is not empty
    item = next(iterator)
    it = (x for x in chain([item], iterator) if random() < fraction)
    for x in chain([next(it, item)], it):
        yield x

def getkey(line):
    return line.split("\t")[3] # 4th column

reductions = [0.25, 0.50, 0.75, 1]
filename = "foo"
outfile = [open("-".join([x, filename]), "w") for x in map(str, reductions)]

try:
    with open(filename, "r") as f:
        for ln, k in enumerate(map(float, reductions)):
            for key, group in groupby(f, key=getkey):
                outfile[ln].writelines(choose_random(group, fraction=k))

finally:
    for f in outfile:
        f.close()

输出显示如下（文件0.25-foo包含正确的缩小，其余为空）：

-rw-r--r--  1 staff  staff   53326048 Mar 27 03:42 0.25-foo
-rw-r--r--  1 staff  staff          0 Mar 27 03:42 0.5-foo
-rw-r--r--  1 staff  staff          0 Mar 27 03:42 0.75-foo
-rw-r--r--  1 staff  staff          0 Mar 27 03:42 1-foo

Answer 1

您打开foo一次，但尝试重复四次。在第一次缩减结束时，您将在文件末尾。要么重新打开它：

try:
    for ln, k in enumerate(map(float, reductions)):
        with open(filename, "r") as f:
            for key, group in groupby(f, key=getkey):
                outfile[ln].writelines(choose_random(group, fraction=k))

finally:
    for f in outfile:
        f.close()

每次减少后

或倒带：

try:
    with open(filename, "r") as f:
        for ln, k in enumerate(map(float, reductions)):
            for key, group in groupby(f, key=getkey):
                outfile[ln].writelines(choose_random(group, fraction=k))
            f.seek(0)

finally:
    for f in outfile:
        f.close()

我会在某个时刻打开这两个文件：

reductions = [0.25, 0.50, 0.75, 1.0]
filename = "foo"

for fraction in reductions:
    with open(filename, "r") as f, open('%s-%s' % (fraction, filename), 'w') as outfile:
        for key, group in groupby(f, key=getkey):
            outfile.writelines(choose_random(group, fraction=fraction))

Python文件缩减 - 第2部分

1 个答案: