Python-os, SYS

The individual doesn't quite understand

OS operation file directory. SYS interacts with the system environment. That's probably it.

Run other programs using the Os.system function

The system () function in the OS module makes it easy to run other programs or scripts. Its function prototype is shown below.

Os.system (command)

The meaning of its parameters is as follows.

command to execute, equivalent to the command entered in the Windows CMD window. If you want to pass parameters to a program or script, you can use a space-delimited program and multiple parameters.

Os Common methods

Os.remove () deleting files

Os.rename () Renaming files

Os.walk () Generate all file names under the directory tree

Os.chdir () Change Directory

Os.mkdir/makedirs Creating a directory/multi-level directory

Os.rmdir/removedirs Deleting a directory/multi-level directory

Os.listdir () lists files for the specified directory

OS.GETCWD () Get the current working directory

Os.chmod () Changing directory permissions

Os.path.basename () Remove directory path, return file name

Os.path.dirname () Remove file name, return directory path

Os.path.join () combines parts of the separation into one path name

Os.path.split () return (DirName (), basename ()) tuple

Os.path.splitext () return (filename, extension) tuple

Os.path.getatime\ctime\mtime returns the last access, creation, modification time, respectively

Os.path.getsize () returns the file size

Os.path.exists () is present

Os.path.isabs () is an absolute path

Os.path.isdir () is a directory

Os.path.isfile () is a file

SYS Common Methods

SYS.ARGV command line argument list, the first element is the path of the program itself

Sys.modules.keys () returns the list of all modules that have been imported

Sys.exc_info () Gets the exception class currently being processed, Exc_type, Exc_value, exc_traceback the exception details currently handled

Sys.exit (n) exit program, Exit normally (0)

Sys.hexversion gets the version value of the Python interpreter, 16 binary format such as: 0x020403f0

Sys.version get version information for Python interpreter

Sys.maxint the largest int value

Sys.maxunicode the largest Unicode value

Sys.modules returns the module field of the system import, key is the module name, value is the module

Sys.path returns the search path for the module, using the value of the PYTHONPATH environment variable when initializing

Sys.platform returns the operating system platform name

Sys.stdout Standard Output

Sys.stdin Standard input

Sys.stderr Error Output

Sys.exc_clear () to clear current or recent error messages that are present on the current thread

Sys.exec_prefix returns the location of the platform standalone Python file installation

Sys.byteorder The local byte rule indicator, the value of the Big-endian platform is ' big ', the value of the Little-endian platform is ' little '

Sys.copyright record python copyright-related things

API version of C for the Sys.api_version interpreter

Summarize:

The OS module is responsible for the interaction between the program and the operating system, provides access to the underlying interface of the operating system, and the SYS module is responsible for the interaction between the program and the Python interpreter, providing a series of functions and variables for manipulating the Python runtime environment.

Python-os, sys