001:os.system

import os
import tempfile

filename1 = tempfile.mktemp (".txt")
open (filename1, "w").close ()
filename2 = filename1 + ".copy"
print filename1, "=>", filename2

#拷檔案
os.system ("copy %s %s" % (filename1, filename2))

if os.path.isfile (filename2): print "Success"

dirname1 = tempfile.mktemp (".dir")
os.mkdir (dirname1)
dirname2 = dirname1 + ".copy"
print dirname1, "=>", dirname2

#拷目錄
os.system ("xcopy /s %s %s" % (dirname1, dirname2))

if os.path.isdir (dirname2): print "Success"
 

2. shutil.copy和shutil.copytree

import os
import shutil
import tempfile

filename1 = tempfile.mktemp (".txt")
open (filename1, "w").close ()
filename2 = filename1 + ".copy"
print filename1, "=>", filename2

#拷檔案
shutil.copy (filename1, filename2)

if os.path.isfile (filename2): print "Success"

dirname1 = tempfile.mktemp (".dir")
os.mkdir (dirname1)
dirname2 = dirname1 + ".copy"
print dirname1, "=>", dirname2

#拷目錄
shutil.copytree (dirname1, dirname2)

if os.path.isdir (dirname2): print "Success"
 

3.  win32file.CopyFile

import os
import win32file
import tempfile

filename1 = tempfile.mktemp (".txt")
open (filename1, "w").close ()
filename2 = filename1 + ".copy"
print filename1, "=>", filename2

#拷檔案
#檔案已存在時，1為不覆蓋，0為覆蓋
win32file.CopyFile (filename1, filename2, 1)
win32file.CopyFile (filename1, filename2, 0)
win32file.CopyFile (filename1, filename2, 1)

if os.path.isfile (filename2): print "Success"

dirname1 = tempfile.mktemp (".dir")
os.mkdir (dirname1)
dirname2 = dirname1 + ".copy"
print dirname1, "=>", dirname2

#拷目錄
win32file.CopyFile (dirname1, dirname2, 1)

if os.path.isdir (dirname2): print "Success"
 

4. SHFileOperation

import os
from win32com.shell import shell, shellcon
import tempfile

filename1 = tempfile.mktemp (".txt")
open (filename1, "w").close ()
filename2 = filename1 + ".copy"
print filename1, "=>", filename2

#拷檔案
#檔案已存在時，shellcon.FOF_RENAMEONCOLLISION會指示重新命名檔案
shell.SHFileOperation (
  (0, shellcon.FO_COPY, filename1, filename2, 0, None, None)
)
shell.SHFileOperation (
  (0, shellcon.FO_COPY, filename1, filename2, shellcon.FOF_RENAMEONCOLLISION, None, None)
)
shell.SHFileOperation (
  (0, shellcon.FO_COPY, filename1, filename2, 0, None, None)
)

if os.path.isfile (filename2): print "Success"

dirname1 = tempfile.mktemp (".dir")
os.mkdir (dirname1)
dirname2 = dirname1 + ".copy"
print dirname1, "=>", dirname2

#拷目錄
shell.SHFileOperation (
  (0, shellcon.FO_COPY, dirname1, dirname2, 0, None, None)
)

if os.path.isdir (dirname2): print "Success"

測試環境：系統——Win7 RTM，CPU——P4 3.0，MEM——1.5G DDR400，U盤——Kingston 4G

用4種不同的方法從硬碟拷貝MSDN 2008 SP1（2.37G）到U盤：

os System      的方法耗時903.218秒
shutil         的方法耗時1850.634秒
win32file      的方法耗時861.438秒
SHFileOperation的方法耗時794.023秒