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## Python3 sys Module The sys module provides access to some variables used or maintained by the interpreter and to functions that interact strongly with the interpreter. ### sys.argv sys.argv is a list in Python, which contains the command-line arguments passed to the script. With sys.argv, you can get the name of the script. Example: ```python #!/usr/bin/python # -*- coding: UTF-8 -*- import sys print('Number of arguments:', len(sys.argv), 'arguments.') print('Argument list:', sys.argv) Output: Number of arguments: 1 arguments. Argument list: ['test.py'] If we execute the script using the following command: python test.py arg1 arg2 arg3 The output will be: Number of arguments: 4 arguments. Argument list: ['test.py', 'arg1', 'arg2', 'arg3'] ### sys.exit(n) Exit the program, you can pass an exit status, 0 means normal exit. ### sys.path When the Python interpreter imports a module, it will search for the module in the following locations: 1. The directory where the current script is located 2. The PYTHONPATH environment variable contains directories with standard installation scripts 3. Python's default installation path (depending on the installation) You can modify sys.path to add the path to import modules. Example: ```python #!/usr/bin/python # -*- coding: UTF-8 -*- import sys print(sys.path) Output: ['/root/PycharmProjects/test', '/usr/lib/python3.4', '/usr/lib/python3.4/plat-x86_64-linux-gnu', '/usr/lib/python3.4/lib-dynload', '/usr/lib/python3.4/site-packages'] ### sys.version Get the version information of the Python interpreter. Example: ```python #!/usr/bin/python # -*- coding: UTF-8 -*- import sys print(sys.version) Output: 3.4.0 (default, Apr 11 2014, 13:05:11) [GCC 4.8.2] ### sys.platform Returns the platform identifier of the system. Example: ```python #!/usr/bin/python # -*- coding: UTF-8 -*- import sys print(sys.platform) Output: linux ### sys.stdin Standard input, usually keyboard input. ### sys.stdout Standard output, usually output to screen. ### sys.stderr Standard error. ### sys.modules sys.modules is a dictionary that stores all loaded modules. ### sys.getrecursionlimit() Get the maximum recursion depth. ### sys.setrecursionlimit() Set the maximum recursion depth. ### sys.getdefaultencoding() Get the default encoding. ### sys.setdefaultencoding() Set the default encoding. ### sys.getfilesystemencoding() Get the file system encoding. ### sys.stdout.write() Write to standard output. ### sys.stdout.flush() Flush standard output. ### sys.exc_info() Get exception information. ### sys.exitfunc() This function is called when the program exits. ### sys.settrace() Set trace function. ### sys.last_traceback The last traceback object. ### sys.executable The path to the Python interpreter. ### sys.hexversion The version of Python in hexadecimal. ### sys.maxsize The maximum size of a list or other container. ### sys.byteorder The byte order of the system. ### sys.copyright Copyright information of Python. ### sys.api_version The API version of Python. ### sys.version_info Get detailed version information. ### sys.dont_write_bytecode Whether to write .pyc files. ### sys.flags Command-line flags. ### sys.warnoptions Warning options. ### sys.builtin_module_names List of built-in module names. ### sys.windows_version Windows version information. ### sys.hash_info Hash algorithm information. ### sys.implementation Implementation information. ### sys.thread_info Thread information. ### sys.float_info Floating-point information. ### sys.abiflags ABI flags. ### sys.base_exec_prefix The base execution prefix. ### sys.base_prefix The base prefix. ### sys.byteorder The byte order. ### sys.callbacks List of callbacks. ### sys.check_interval Check interval. ### sys.console_title Console title. ### sys.dllhandle DLL handle. ### sys.dso_handle DSO handle. ### sys.exc_clear Clear exception. ### sys.exc_type Exception type. ### sys.exc_value Exception value. ### sys.exec_prefix Execution prefix. ### sys.executable Executable path. ### sys.flags Flags. ### sys.float_repr_style Float representation style. ### sys.getallocatedblocks() Get allocated blocks. ### sys.getcheckinterval() Get check interval. ### sys.getfilesystemencoding() Get file system encoding. ### sys.getprofile() Get profile function. ### sys.getrecursionlimit() Get recursion limit. ### sys.getsizeof() Get size of an object. ### sys.getswitchinterval() Get switch interval. ### sys.gettrace() Get trace function. ### sys.hexversion Hex version. ### sys.int_info Integer information. ### sys.long_info Long integer information. ### sys.maxsize Maximum size. ### sys.maxunicode Maximum Unicode value. ### sys.path_hooks Path hooks. ### sys.path_importer_cache Path importer cache. ### sys.platform Platform. ### sys.prefix Prefix. ### sys.ps1 Primary prompt string. ### sys.ps2 Secondary prompt string. ### sys.setcheckinterval() Set check interval. ### sys.setprofile() Set profile function. ### sys.setrecursionlimit() Set recursion limit. ### sys.setswitchinterval() Set switch interval. ### sys.settrace() Set trace function. ### sys.stderr Standard error. ### sys.stdin Standard input. ### sys.stdout Standard output. ### sys.thread_info Thread information. ### sys.version Version. ### sys.version_info Version information. ### sys.warnoptions Warning options. ### sys.winver Windows version. ## Related Links - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - [Python Number(Number)](#) - (#) - [Python Lists(List)](#) - (#) - [Python Dictionaries(Dictionary)](#) - (#) - (#) - (#) - [Python File I/O/O](#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - (#) - [Python GUI programming(Tkinter)](#) - [Python 2.x And 3.x Version Differences](#) - (#) - (#) - (#) ## Comments Please share your experience, questions, or suggestions to help others learn better. 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