常用属性
import sys print(sys.argv) # 命令行参数list,第一个元素是程序本身路径 print(sys.version) # python解释器版本 3.4.1 print(sys.maxsize) # 最大值 9223372036854775807 print(sys.path) # 返回模块的搜索路径 print(sys.platform) # 返回操作系统平台名称win32 sys.stdout.write("hello") val = sys.stdin.readline()[:-1] print("val",val)
help(sys)
Dynamic objects:
argv -- command line arguments; argv[0] is the script pathname if known path -- module search path; path[0] is the script directory, else '' modules -- dictionary of loaded modules displayhook -- called to show results in an interactive session excepthook -- called to handle any uncaught exception other than SystemExit To customize printing in an interactive session or to install a custom top-level exception handler, assign other functions to replace these. stdin -- standard input file object; used by input() stdout -- standard output file object; used by print() stderr -- standard error object; used for error messages By assigning other file objects (or objects that behave like files) to these, it is possible to redirect all of the interpreter's I/O. last_type -- type of last uncaught exception last_value -- value of last uncaught exception last_traceback -- traceback of last uncaught exception These three are only available in an interactive session after a traceback has been printed.
Static objects:
builtin_module_names -- tuple of module names built into this interpreter copyright -- copyright notice pertaining to this interpreter exec_prefix -- prefix used to find the machine-specific Python library executable -- absolute path of the executable binary of the Python interpreter float_info -- a struct sequence with information about the float implementation. float_repr_style -- string indicating the style of repr() output for floats hash_info -- a struct sequence with information about the hash algorithm. hexversion -- version information encoded as a single integer implementation -- Python implementation information. int_info -- a struct sequence with information about the int implementation. maxsize -- the largest supported length of containers. maxunicode -- the value of the largest Unicode codepoint platform -- platform identifier prefix -- prefix used to find the Python library thread_info -- a struct sequence with information about the thread implementation. version -- the version of this interpreter as a string version_info -- version information as a named tuple dllhandle -- [Windows only] integer handle of the Python DLL winver -- [Windows only] version number of the Python DLL __stdin__ -- the original stdin; don't touch! __stdout__ -- the original stdout; don't touch! __stderr__ -- the original stderr; don't touch! __displayhook__ -- the original displayhook; don't touch! __excepthook__ -- the original excepthook; don't touch!
Functions:
displayhook() -- print an object to the screen, and save it in builtins._ excepthook() -- print an exception and its traceback to sys.stderr exc_info() -- return thread-safe information about the current exception exit() -- exit the interpreter by raising SystemExit getdlopenflags() -- returns flags to be used for dlopen() calls getprofile() -- get the global profiling function getrefcount() -- return the reference count for an object (plus one :-) getrecursionlimit() -- return the max recursion depth for the interpreter getsizeof() -- return the size of an object in bytes gettrace() -- get the global debug tracing function setcheckinterval() -- control how often the interpreter checks for events setdlopenflags() -- set the flags to be used for dlopen() calls setprofile() -- set the global profiling function setrecursionlimit() -- set the max recursion depth for the interpreter settrace() -- set the global debug tracing function
