問題描述

我嘗試了不同的方式來壓縮文件夾.我的理解是 Python 內(nèi)置模塊總是比 subprocess.call("Linux command") 快.但我只是做了一些演示.tarfile 模塊比 subprocess.call("tar") 慢.有人可以向我解釋一下嗎?

I tried the different way to zip folder.My understanding is that Python built-in module always faster than subprocess.call("Linux command"). But I just did some demo. The tarfile module is slow than subprocess.call("tar").Can someone explain it to me?

    #!/usr/bin/python

import os
import time
import tarfile
import subprocess

tStart1 = time.time()

TestFolder = ["Jack", "Robin"]
for folder in TestFolder:
    name = "/mnt/ShareDrive/Share/ExistingUsers/"+folder
    path = "/mnt/TEST2/"
    tar = tarfile.open(path+folder+".tar.gz", "w:gz")
    tar.add(name)
    tar.close()
tEnd1 = time.time()

time.sleep(2)

tStart2 = time.time()
for folder in TestFolder:
    path = "/mnt/TEST1/"
    subprocess.call(["tar", "zcvf", path+folder+".tar.gz", "-P", "/mnt/ShareDrive/Share/ExistingUsers/"+folder])
tEnd2 = time.time()

print "The module cost %f sec" % (tEnd1 - tStart1)
print "The subprocess cost %f sec" % (tEnd2 - tStart2)

tarfile 模塊耗時 63 秒.子流程僅需 32 秒.

The tarfile module cost 63 sec. The subprocess cost only 32 sec.

兩個文件夾的總大小為 433 MB

The total size of two folders is 433 MB

推薦答案

tar 是用 C 語言編寫的.tarfile 模塊是 tar 處理的純 Python 實現(xiàn).模塊不可能比命令快.

tar is written in C. The tarfile module is a pure Python implementation of tar handling. There is no way that the module will be faster than the command.

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