打印所有Python内置子模块和内置模块的功能

Question

I want to print all the available functions and sub-modules in a built-in module. For example:

dir(__import__("sys"))

It gives a list of classes and methods.

['__displayhook__',
'__doc__',
'__egginsert',
'__excepthook__',
'__name__',
'__package__',
'__plen',
'__stderr__',
'__stdin__',
'__stdout__',
'argv',
'builtin_module_names',
'byteorder',
'call_tracing',
'stdin',
'stdout',
'subversion',
'version',
'version_info',
'warnoptions',
'winver'] ...etc

but what i want is , I want to check all the available methods inside the class sys.stdin ie

sys.stdin constains the following functions like

sys.stdin.close  
sys.stdin.name       
sys.stdin.softspace  
sys.stdin.readline  
sys.stdin.readlines  
sys.stdin.seek  ...etc

So how to print all the availbale methods of a sub-module class.
I'm curious on how to implement this.
Thanks.
EDIT:

module_name = "sys" #module is taken from the user
smod ="stdin" # select the desire sub-module
param = module_name + smod
def printFns(param):
     #code to print all the available functions

Answer 1

You could use the same method that you used for sys module. ie

>>> import sys
>>> dir(sys.stdin)
['__class__', '__delattr__', '__doc__', '__enter__', '__exit__', '__format__', '__getattribute__', '__hash__', '__in
educe__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'close', 'closed'
'flush', 'isatty', 'mode', 'name', 'newlines', 'next', 'read', 'readinto', 'readline', 'readlines', 'seek', 'softspa
'writelines', 'xreadlines']