help函数是一个内置函数，用于查看函数或模块用途的详细说明
import copy print(help(copy.copy))
Help on function copy in module copy:
copy(x)
Shallow copy operation on arbitrary Python objects.
See the module's __doc__ string for more info.
None
dir()函数时python的内置函数，dir()函数不带参数时，返回当前范围内的变量、方法和定义的类型列表，带参数时，返回参数的属性、方法列表
print(copy.copy)
['__annotations__', '__call__', '__class__', '__closure__', '__code__', '__defaults__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__get__', '__getattribute__', '__globals__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__kwdefaults__', '__le__', '__lt__', '__module__', '__name__', '__ne__', '__new__', '__qualname__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__']