Python
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>>> import sys
常用变量sys.version
>>> import sys>>> sys.version3.8.5 (tags/v3.8.5:580fbb0, Jul 20 2020, 15:57:54) [MSC v.1924 64 bit (AMD64)]
sys.maxsize
>>> import sys>>> sys.maxsize9223372036854775807
sys.maxunicode
>>> import sys>>> sys.maxunicode1114111
sys.path
当前脚本的path环境变量，如果没有python就找到
>>> import sys>>> sys.path['', 'D:\\Python3.8\\python38.zip', 'D:\\Python3.8\\DLLs', 'D:\\Python3.8\\lib', 'D:\\Python3.8', 'D:\\Python3.8\\lib\\site-packages']
sys.platform
| 系统 | 返回值 |
|---|---|
| Windows | ‘win32’ |
| Linux | ‘linux’ |
| Mac | ‘darwin’ |
>>> import sys>>> sys.platformwin32
sys.argv
import sysprint(sys.argv)
E:\Python> python 2.py hello python['2.py', 'hello', 'python']
sys.executable
>>> import sys>>> sys.executable'D:\\Python3.8\\python.exe'
sys.byteorder
>>> import sys>>> sys.byteorder'little'
sys.version_info
>>> import sys>>> sys.version_infosys.version_info(major=3, minor=7, micro=3, releaselevel='final', serial=0)
sys.api_version
>>> import sys>>> sys.api_version1013
sys.stdin/sys.stdout/sys.stderr
>>> import sys>>> sys.stdin<_io.TextIOWrapper name='' mode='r' encoding='utf-8'>>>> sys.stdout<_io.TextIOWrapper name='' mode='w' encoding='utf-8'>>>> sys.stderr<_io.TextIOWrapper name='' mode='w' encoding='utf-8'>
常用方法sys.exit()
import sysprint(sys.exit(0))print(sys.exit(1))
sys.modules
>>> import sys>>> sys.modules{'sys': , 'builtins': , '_frozen_importlib': , '_imp': , '_warnings': , '_frozen_importlib_external': , '_io': , 'marshal': , 'nt': , '_thread': , '_weakref': , 'winreg': , 'time': , 'zipimport': , '_codecs': , 'codecs': , 'encodings.aliases': , 'encodings': , 'encodings.utf_8': , '_codecs_cn': , '_multibytecodec': , 'encodings.gbk': , '_signal': , '__main__': , 'encodings.latin_1': , '_abc': , 'abc': , 'io': , '_stat': , 'stat': , '_collections_abc': , 'genericpath': , 'ntpath': , 'os.path': , 'os': , '_sitebuiltins': , '_locale': , '_bootlocale': , 'types': , 'importlib._bootstrap': , 'importlib._bootstrap_external': , 'warnings': , 'importlib': , 'importlib.machinery': , 'importlib.abc': , '_operator': , 'operator': , 'keyword': , '_heapq': , 'heapq': , 'itertools': , 'reprlib': , '_collections': , 'collections': , '_functools': , 'functools': , 'contextlib': , 'importlib.util': , 'mpl_toolkits': , 'site': , 'atexit': }sys.modules.keys()
>>> import sys>>> sys.modules.keys()dict_keys(['sys', 'builtins', '_frozen_importlib', '_imp', '_warnings', '_frozen_importlib_external', '_io', 'marshal', 'nt', '_thread', '_weakref', 'winreg', 'time', 'zipimport', '_codecs', 'codecs', 'encodings.aliases', 'encodings', 'encodings.utf_8', '_codecs_cn', '_multibytecodec', 'encodings.gbk', '_signal', '__main__', 'encodings.latin_1', '_abc', 'abc', 'io', '_stat', 'stat', '_collections_abc', 'genericpath', 'ntpath', 'os.path', 'os', '_sitebuiltins', '_locale', '_bootlocale', 'types', 'importlib._bootstrap', 'importlib._bootstrap_external', 'warnings', 'importlib', 'importlib.machinery', 'importlib.abc', '_operator', 'operator', 'keyword', '_heapq', 'heapq', 'itertools', 'reprlib', '_collections', 'collections', '_functools', 'functools', 'contextlib', 'importlib.util', 'mpl_toolkits', 'site', 'atexit'])
sys.getdefaultencoding()
>>> import sys>>> sys.getdefaultencoding()'utf-8'
sys.getfilesystemencoding()
>>> import sys>>> sys.getfilesystemencoding()utf-8
sys.getrecursionlimit()
>>> import sys>>> sys.getrecursionlimit() # 查看当前解释器的最大递归深度1000
sys.setrecursionlimit(num)
>>> import sys>>> sys.setrecursionlimit(1100) # 将解释器的最大递归深度设置为1100>>> sys.getrecursionlimit() # 再次查看当前解释器的最大递归深度1100
sys.getsizeof()
>>> import sys>>> for obj in [int(), float(), list(), tuple(), set(), dict(), object]:... print(str(obj.__class__).ljust(20), sys.getsizeof(obj))... 24 24 56 40 216 232 416
sys.getrefcount(obj)
>>> import sys>>> a = [1,2,3]>>> b = a>>> c = b>>> sys.getrefcount(a)4
sys.exc_info()
获取当前正在处理的异常类，exc_type、exc_value、exc_traceback当前处理的异常详细信息
>>> import sys>>> sys.exc_info()(None, None, None)
sys.getwindowsversion()
>>> import sys>>> sys.getwindowsversion()sys.getwindowsversion(major=10, minor=0, build=19041, platform=2, service_pack='')
sys.stdin.readline()sys.stdout.write()
>>> import sys>>> sys.stdout.write("hello world")hello world11python教学