dir()函数是一个库函数，用于获取对象的所有属性和方法的列表，它接受一个对象并返回所有内置的，用户定义的属性，不带值的方法的列表。
语法：
dir(object)
Parameter(s)： object-一个对象，它需要我们的属性和方法。
返回值： list –返回所有属性和方法的列表。
示例
Input: class std_info: name = "Amit shukla" age = 21 course = "B.Tech (CS)" # printing details using dir() function print(dir(std_info)) Output: ['__class__', '__delattr__', '__dict__'... ...'age', 'course', 'name']
Python代码获取对象的属性，方法列表
# python代码演示示例
# dir() number
class std_info:
name = "Amit shukla"
age = 21
course = "B.Tech (CS)"
# printing return type of dir() function
print("return type of dir(): ", type(dir(std_info)))
# printing details using dir() function
print(dir(std_info))输出结果
return type of dir(): <class 'list'> ['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__se tattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'age', 'course', 'name']
Python代码获取属性列表，整数方法和float对象
# python代码演示示例
# dir() number
a = 10
b = 10.23
print("a has...")
print(dir(a))
print("b has...")
print(dir(a))输出结果
a has... ['__abs__', '__add__', '__and__', '__bool__', '__ceil__', '__class__', '__delattr__', '__dir__', '__divmod__', '__doc__', '__eq __', '__float__', '__floor__', '__floordiv__', '__format__', '__ge__', '__getattribute__', '__getnewargs__', '__gt__', '__hash_ _', '__index__', '__init__', '__int__', '__invert__', '__le__', '__lshift__', '__lt__', '__mod__', '__mul__', '__ne__', '__neg_ _', '__new__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__', '__rdivmod__', '__reduce__', '__reduce_ex__', '__repr__' , '__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__', '__ror__', '__round__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__truediv__', '__trunc__', '__xor__', 'bit_length', 'conjugate', 'denominator', 'from_bytes', 'imag', 'numerator', 'real', 'to_bytes'] b has... ['__abs__', '__add__', '__and__', '__bool__', '__ceil__', '__class__', '__delattr__', '__dir__', '__divmod__', '__doc__', '__eq__', '__float__', '__floor__', '__floordiv__', '__format__', '__ge__', '__getattribute__', '__getnewargs__', '__gt__', '__hash__', '__index__', '__init__', '__int__', '__invert__', '__le__', '__lshift__', '__lt__', '__mod__', '__mul__', '__ne__', '__neg__', '__new__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__', '__rdivmod__', '__reduce__', '__reduce_ex__', '__repr__' , '__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__', '__ror__', '__round__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__truediv__', '__trunc__', '__xor__', 'bit_length', 'conjugate', 'denominator', 'from_bytes', 'imag', 'numerator', 'real', 'to_bytes']