英文文档：
vars ([object]) Return the __dict__ attribute for a module, class, instance, or any other object with a __dict__ attribute. Objects such as modules and instances have an updateable __dict__ attribute; however, other objects may have write restrictions on their __dict__ attributes (for example, classes use a dictproxy to prevent direct dictionary updates). Without an argument, vars() acts like locals(). Note, the locals dictionary is only useful for reads since updates to the locals dictionary are ignored.返回当前作用域内的局部变量和其值组成的字典，或者返回对象的属性列表
说明
1. 当函数不接收参数时，其功能和locals函数一样，返回当前作用域内的局部变量。
#不带参数功能和locals函数一样>>> v1 = vars()>>> l1 = locals()>>> v1{'__name__': '__main__', '__builtins__': <module 'builtins' (built-in)>, 'v1': {...}, 'l1': {...}, '__spec__': None, '__doc__': None, '__package__': None, '__loader__': <class '_frozen_importlib.BuiltinImporter'>}>>> l1{'__name__': '__main__', '__builtins__': <module 'builtins' (built-in)>, 'v1': {...}, 'l1': {...}, '__spec__': None, '__doc__': None, '__package__': None, '__loader__': <class '_frozen_importlib.BuiltinImporter'>}2. 当函数接收一个参数时，参数可以是模块、类、类实例，或者定义了__dict__属性的对象。
#作用于模块>>> import time>>> vars(time){'gmtime': <built-in function gmtime>, 'tzname': ('Öйú±ê׼ʱ¼ä', 'ÖйúÏÄÁîʱ'), 'timezone': -28800, 'struct_time': <class 'time.struct_time'>, 'ctime': <built-in function ctime>, 'perf_counter': <built-in function perf_counter>, 'mktime': <built-in function mktime>, 'localtime': <built-in function localtime>, 'time': <built-in function time>, '__package__': '', 'altzone': -32400, 'clock': <built-in function clock>, 'strptime': <built-in function strptime>, 'monotonic': <built-in function monotonic>, '__loader__': <class '_frozen_importlib.BuiltinImporter'>, 'get_clock_info': <built-in function get_clock_info>, 'sleep': <built-in function sleep>, 'process_time': <built-in function process_time>, '__name__': 'time', '_STRUCT_TM_ITEMS': 9, '__spec_美丽的学姐(name='time', loader=<class '_frozen_importlib.BuiltinImporter'>, origin='built-in'), '__doc__': 'This module provides various functions to manipulate time values.斯文的早晨n斯文的早晨nThere are two standard representations of time. One is the number斯文的早晨nof seconds since the Epoch, in UTC (a.k.a. GMT). It may be an integer斯文的早晨nor a floating point number (to represent fractions of seconds).斯文的早晨nThe Epoch is system-defined; on Unix, it is generally January 1st, 1970.斯文的早晨nThe actual value can be retrieved by calling gmtime(0).斯文的早晨n斯文的早晨nThe other representation is a tuple of 9 integers giving local time.斯文的早晨nThe tuple items are:斯文的早晨n year (including century, e.g. 1998)斯文的早晨n month (1-12)斯文的早晨n day (1-31)斯文的早晨n hours (0-23)斯文的早晨n minutes (0-59)斯文的早晨n seconds (0-59)斯文的早晨n weekday (0-6, Monday is 0)斯文的早晨n Julian day (day in the year, 1-366)斯文的早晨n DST (Daylight Savings Time) flag (-1, 0 or 1)斯文的早晨nIf the DST flag is 0, the time is given in the regular time zone;斯文的早晨nif it is 1, the time is given in the DST time zone;斯文的早晨nif it is -1, mktime() should guess based on the date and time.斯文的早晨n斯文的早晨nVariables:斯文的早晨n斯文的早晨ntimezone -- difference in seconds between UTC and local standard time斯文的早晨naltzone -- difference in seconds between UTC and local DST time斯文的早晨ndaylight -- whether local time should reflect DST斯文的早晨ntzname -- tuple of (standard time zone name, DST time zone name)斯文的早晨n斯文的早晨nFunctions:斯文的早晨n斯文的早晨ntime() -- return current time in seconds since the Epoch as a float斯文的早晨nclock() -- return CPU time since process start as a float斯文的早晨nsleep() -- delay for a number of seconds given as a float斯文的早晨ngmtime() -- convert seconds since Epoch to UTC tuple斯文的早晨nlocaltime() -- convert seconds since Epoch to local time tuple斯文的早晨nasctime() -- convert time tuple to string斯文的早晨nctime() -- convert time in seconds to string斯文的早晨nmktime() -- convert local time tuple to seconds since Epoch斯文的早晨nstrftime() -- convert time tuple to string according to format specification斯文的早晨nstrptime() -- parse string to time tuple according to format specification斯文的早晨ntzset() -- change the local timezone', 'strftime': <built-in function strftime>, 'asctime': <built-in function asctime>, 'daylight': 0}#作用于类>>> vars(slice)mappingproxy({'__ne__': <slot wrapper '__ne__' of 'slice' objects>, '__getattribute__': <slot wrapper '__getattribute__' of 'slice' objects>, '__reduce__': <method '__reduce__' of 'slice' objects>, 'start': <member 'start' of 'slice' objects>, 'indices': <method 'indices' of 'slice' objects>, '__ge__': <slot wrapper '__ge__' of 'slice' objects>, 'stop': <member 'stop' of 'slice' objects>, '__eq__': <slot wrapper '__eq__' of 'slice' objects>, 'step': <member 'step' of 'slice' objects>, '__hash__': None, '__doc__': 'slice(stop)斯文的早晨nslice(start, stop[, step])斯文的早晨n斯文的早晨nCreate a slice object. This is used for extended slicing (e.g. a[0:10:2]).', '__repr__': <slot wrapper '__repr__' of 'slice' objects>, '__le__': <slot wrapper '__le__' of 'slice' objects>, '__gt__': <slot wrapper '__gt__' of 'slice' objects>, '__new__': <built-in method __new__ of type object at 0x6A91B420>, '__lt__': <slot wrapper '__lt__' of 'slice' objects>})#作用于类实例>>> class A(object): pass>>> a.__dict__{}>>> vars(a){}>>> a.name = 'Kim'>>> a.__dict__{'name': 'Kim'}>>> vars(a){'name': 'Kim'}