Basic python and python tutorials

Basic python and python tutorials

I am not very familiar

OS operation file directory. Sys interacts with the system environment. This is probably the case.

 

Use the OS. system function to run other programs

The system () function in the OS module can easily run other programs or scripts. The function prototype is as follows.

OS. system (command)

The parameter meanings are as follows.

The command to be executed is equivalent to the command entered in the Windows cmd window. If you want to pass parameters to a program or script, you can use spaces to separate the program and multiple parameters.

 

Common OS Methods

 

OS. remove () delete a file

OS. rename () rename the file

OS. walk () generates all file names under the directory tree

OS. chdir () Change directory

OS. mkdir/makedirs create directory/multi-level directory

OS. rmdir/removedirs Delete directory/multi-level directory

OS. listdir (): List objects in a specified directory

OS. getcwd () to get the current working directory

OS. chmod () change Directory Permissions

OS. path. basename () Remove the directory path and return the file name.

OS. path. dirname () remove the file name and return the directory path.

OS. path. join () combines the separated parts into a path name.

OS. path. split () returns the (dirname (), basename () tuples.

OS. path. splitext () returns the (filename, extension) tuples.

OS. path. getatime \ ctime \ mtime return the last access, creation, and modification time respectively.

OS. path. getsize () returns the file size.

OS. path. exists ()

Whether OS. path. isabs () is an absolute path

Whether OS. path. isdir () is a directory

Whether OS. path. isfile () is a file

 

Common sys Methods

 

Sys. argv command line parameter List. The first element is the program path.

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

Sys. exc_info () obtains the exception classes currently being processed, including exc_type, exc_value, and exc_traceback.

Sys. exit (n) exit the program. exit (0) when the program Exits normally)

Sys. hexversion: get the version value of the Python interpreter. The hexadecimal format is 0x020403F0.

Sys. version: get the version information of the Python interpreter.

Maximum Int value of sys. maxint

Maximum Unicode value of sys. maxunicode

Sys. modules: return the module field imported by the system. The key is the module name and the value is the module.

Sys. path: return the search path of the module. The value of the PYTHONPATH environment variable is used during initialization.

Sys. platform: returns the name of the operating system platform.

Sys. stdout standard output

Sys. stdin standard input

Sys. stderr error output

Sys. exc_clear () is used to clear the current or recent error message of the current thread.

Sys.exe c_prefix: return the location where the python file on the platform is installed.

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

Sys. copyright records the copyright related to python

API version of sys. api_version C of the interpreter

 

Summary:

 

The OS module is responsible for the interaction between the program and the operating system, and provides the interface for accessing the underlying operating system. The sys module is responsible for the interaction between the program and the python interpreter, and provides a series of functions and variables, it is used to manipulate the runtime environment of python.