Day6 SYS module and day6sys Module
SYS module
Provides operations related to the Python Interpreter:
(1)Sys. argv command line parameters
List
The first element is the program path.
>>> Sys. argv
['']
(2)Sys. exit (n) exit the program. exit (
0
)
(3)Sys. version: get the version information of the Python interpreter.
(4)The largest value of sys. maxint
Int
Value
(5)Sys. path: return the search path of the module. When initializing, use
Value
>>> Sys. path
['', '/Usr/local/lib/python3.5/dist-packages/pygame-1.9.4.dev0-py3.5-linux-x86_64.egg', '/usr/lib/python35.zip', '/usr/lib/python3.5 ', '/usr/lib/python3.5/load', '/usr/lib/python3.5/lib-dynload', '/home/zhuzhu /. local/lib/python3.5/site-packages ','/usr/local/lib/python3.5/dist-packages ','/usr/lib/python3/dist-packages ']
(6)Sys. platform return to the operating system platform
Name
>>> Sys. platform
'Linux'
(7)Sys. stdin Input
(8)Sys. stdout output
(9)Sys. stderror Error
Progress percentage:
import time,sysdef view_bar(num,total): rate = float(num) / float(total) rate_num = int(rate * 100) r = '\r%d%%' %(rate_num,) sys.stdout.write(r) sys.stdout.flush()if __name__ == "__main__": for i in range(0,100): time.sleep(0.1) view_bar(i,100)
Shutil Module
Advanced file, folder, and compressed Package Processing Module
(1) copyfileobj (fsrc, fdst, length = 16*1024)
Def copyfileobj (fsrc, fdst, length = 16*1024 ):
"Copy data from file-like object fsrc to file-like object fdst """
While 1:
Buf = fsrc. read (length)
If not buf:
Break
Fdst. write (buf)
Shutil. copyfileobj (fsrc, fdst [, length])
Import shutil # import module
Shutil. copyfileobj (open ("old_file", "r"), open ("new_file", "w") # open two files and copy the content of one file to another.
(2)Shutil. copyfile (src, dst)
Def copyfile (src, dst, *, follow_symlinks = True ):
"Copy data from src to dst.
If follow_symlinks is not set and src is a symbolic link, a new
Symlink will be created instead of copying the file it points.
"""
Import shutil # import a file
Shutil. copyfile ("old_file", "new_file") # import file information to another file
(3)Shutil. copymode (src, dst)
Only copy permission. Contents, groups, and users remain unchanged
shutil.copymode(
'f1.log'
,
'f2.log'
)
(4)Shutil. copystat (src, dst)
Only copy status information, including: mode bits, atime, mtime, flags
shutil.copystat(
'f1.log'
,
'f2.log'
)
(5)Shutil. copy (src, dst)
Copy files and permissions
shutil.copy(
'f1.log'
,
'f2.log'
)
(6)Shutil. copy2 (src, dst)
Copy file and status information
shutil.copy2(
'f1.log'
,
'f2.log'
)
(7)Shutil. ignore_patterns (* patterns)
(8)Shutil. copytree (src, dst, symlinks = False, ignore = None)
Recursively copy folders
import
shuti
L
shutil.copytree(
'folder1'
,
'folder2'
, ignore
=
shutil.ignore_patterns(
'*.pyc'
,
'tmp*'
))
(9)Shutil. rmtree (path [, ignore_errors [, onerror])
Recursively delete an object
import
shuti
L
shutil.rmtree(
'folder1'
)
(10)Shutil. move (src, dst)
Recursively move a file, which is similar to the mv command, is actually renaming
import
shuti
L
shutil.move(
'folder1'
,
'folder3'
)
(11)Shutil. make_archive (base_name, format ,...)
Create a compressed package and return the file path, such as zip and tar.
Create a compressed package and return the file path, such as zip and tar.
Base_name: the file name of the compressed package. It can also be the path of the compressed package. Only when the file name is used, it is saved to the current directory; otherwise, it is saved to the specified path.
For example, save www => to the current path
For example:/Users/wupeiqi/www => Save to/Users/wupeiqi/
Format: Compressed package type, "zip", "tar", "bztar", and "gztar"
Root_dir: Path of the folder to be compressed (default current directory)
Owner: user. The current user is used by default.
Group: group. Default Value: current group.
Logger: used to record logs, usually a logging. Logger object.
# Package files in/Users/wupeiqi/Downloads/test to the current program directory
import
shuti
L
ret
=
shutil.make_archive(
"wwwwwwwwww"
,
'gztar'
, root_dir
=
'/Users/wupeiqi/Downloads/test'
)
# Package/Users/wupeiqi/Downloads/test files and place them in the/Users/wupeiqi/directory.
import
shuti
L
ret
=
shutil.make_archive(
"/Users/wupeiqi/wwwwwwwwww"
,
'gztar'
, root_dir
=
'/Users/wupeiqi/Downloads/test'
)
Shutil calls ZipFile and TarFile to process the compressed package. Details:
Import zipfile # compress z = zipfile. zipFile ("lowb.zip", "w") # first open the file and add the file to be compressed to the file. write ("new_file") z. write ("old_file") # Add a file to the file, decompress it together, and add the compressed file z. close () # decompress z = zipfile. zipFile ("lowb.zip", "r") # first open the file and decompress it. extractall () # decompress the file z. close ()
Tar format compression and decompression
Import tarfile # compress the file # tar = tarfile. open ("lowB.tar", "w") # first open the file and add the file to be compressed # tar. add ("new_file") # tar. add ("old_file") # tar. close () # decompress the file tar = tarfile. open ("lowB.tar", "r") # open the file and decompress tar. extractall () # You can set the extract address tar. close ()
To decompress and decompress a file, you must first open the file, add the file to it, and add the file to be compressed. to decompress the file, you must first open the file and decompress it using extractall.