[ Python 常見問題 ] Pandas - Get list from pandas DataFrame column headers

Source From Here 
Question 
I want to get a list of the column headers from a pandas DataFrame. For example, if I'm given a DataFrame like this: 

>>> df = pd.DataFrame({"name":('John', 'Ken'), "age":(33, 23)}) 
>>> df.head() 
age name 
0 33 John 
1 23 Ken

How to get the column list as ("age", "name")? 

How-To 
Check below sample code: 

>>> list(df.columns.values) 
['age', 'name'] 
>>> df.columns.values // numpy array 
array(['age', 'name'], dtype=object)