$python>>>import sys>>>dir(sys)# get list of attributes for sys module['__displayhook__','__doc__','__excepthook__','__name__','__stderr__','__stdin__','__stdout__','_getframe','api_version','argv','builtin_module_names','byteorder','call_tracing','callstats','copy...
在Python编程中,使用dir()函数可以让我们快速了解一个对象的结构和内容,大大提高了编程效率。我们可以使用dir()函数列出任何Python对象的属性和方法,例如字符串、列表、模块、类等等。无论是初学者还是有经验的开发者,都应该熟练掌握dir()函数的使用。
The operators "in" and "not in" test for membership. "x in s" evaluates to true if *x* is a member of *s*, and false otherwise. "x not in s" returns the negation of "x in s". All built-in sequences and set types support this as well as dictionary, for which "in" tests...
The dir() method takes in a single parameter: object - can be an empty/filled tuple, list, set, dictionary etc or any user-defined object dir() Return Value The dir() method returns: . the list of attributes of the object passed to the method Example 1: Python dir() with a List...
'__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__str__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort...
set集合 会先使用__eq__方法判断值是否一样,如果一样就会去重,即使内存地址一样 __hash__方法只是返回一个hash值作为set的key,但是去重,还需要__eq__来判断2个对象是否相等 hash 值相等,只是hash冲突,不能说明两个对象是相等的 因此,一般来说提供__hash__方法是为了作为set或者dict的key的,所以去重要同时提...
'SystemRandom', 'TWOPI', '_BuiltinMethodType', '_MethodType', '_Sequence', '_Set', '__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', '_acos', '_ceil', '_cos', '_e', '_exp', ...
'__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__str__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort...
'__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort'] 然后查看list的pop方...
dirent 和 DIRPyCharm pip报错no such option: --build-dirdir和help是Python中两个强大的built-in...