from shutil import *
import os
from StringIO import StringIO
import sys
class VerboseStringIO(StringIO):
def read(self, n=-1):
next = StringIO.read(self, n)
print 'read(%d) bytes' % n
return next
lorem_ipsum = '''This makes the dependency explicit, limits the scope to the current file and provides faster access to the bit.* functions, too.
It's good programming practice not to rely on the global variable bit being set (assuming some other part of your application has already loaded the module).
The require function ensures the module is only loaded once, in any case.'''
print 'Defalut:'
input = VerboseStringIO(lorem_ipsum)
output = StringIO()
copyfileobj(input, output)
print
print 'All at once:'
input = VerboseStringIO(lorem_ipsum)
output = StringIO()
copyfileobj(input, output, -1)
print
print 'Blocks of 256:'
input = VerboseStringIO(lorem_ipsum)
output = StringIO()
copyfileobj(input, output, 256)
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默认行为是使用大数据块读取。使用-1会一次性读取所有输入，或者使用其他正数可以设置特定块的大小。
>>> ================================ RESTART ================================
>>>
Defalut:
read(16384) bytes
read(16384) bytes
All at once:
read(-1) bytes
read(-1) bytes
Blocks of 256:
read(256) bytes
read(256) bytes
read(256) bytes
from shutil import *
import os
dir = os.getcwd()
if not os.path.exists('%s\\example' % dir):
os.mkdir('%s\\example' % dir)
print 'BEFORE:', os.listdir('example')
copy('huanhuan.txt', 'example')
print 'AFTER:', os.listdir('example')
from shutil import *
import os
from commands import *
with open('file_to_change.txt', 'wt') as f:
f.write('i love you')
os.chmod('file_to_change.txt', 0444)
print 'BEFORE:'
print getstatus('file_to_change.txt')
copymode('shutil_copymode.py', 'file_to_change.txt')
print 'AFTER:'
print getstatus('file_to_change.txt')
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要复制其他元数据，可以使用copystat()。
from shutil import *
import os
import time
def show_file_info(filename):
stat_info = os.stat(filename)
print '\tMode :', stat_info.st_mode
print '\tCreated :', time.ctime(stat_info.st_ctime)
print '\tAccessed :', time.ctime(stat_info.st_atime)
print '\tModified :', time.ctime(stat_info.st_mtime)
with open('file_to_change.txt', 'wt') as f:
f.write('i love you')
os.chmod('file_to_Change.txt', 0444)
print 'BEFORE:'
show_file_info('file_to_Change.txt')
copystat('shutil_copystat.py', 'file_to_Change.txt')
print 'AFTER:'
show_file_info('file_to_Change.txt')
from shutil import *
from glob import glob
with open('example.txt', 'wt') as f:
f.write('i love you')
print 'BEFORE: ', glob('example*')
move('example.txt', 'example.out')
print 'AFTER: ',glob('example*')
