[ Python 常見問題 ] Finding what methods an object has

Source From Here 
Question 
Given a Python object of any kind, is there an easy way to get a list of all methods that this object has? 

How-To 
It appears you can use below code (callable/getattr): 
- test.py 

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1. #!/usr/bin/env python3  
2.   
3. class Test:  
4.     def __init__(self):  
5.         pass  
6.   
7.     def add(self, a, b):  
8.         return a + b  
9.   
10.     def sub(self, a, b):  
11.         return a - b  
12.   
13.   
14. to = Test()  
15. to_methods = [method for method in dir(to) if callable(getattr(to, method))]  
16. for m in to_methods:  
17.     print("{}".format(m))  

Execution output: 

# ./test.py
__class__
__delattr__
__dir__
__eq__
__format__
__ge__
...
__sizeof__
__str__
__subclasshook__
add
sub

I discovered it at this site, hopefully that should provide some further detail!