#open you cmd and there type py
C:\Users\acer>py
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>># Now start coding on cmd
>>>print("Python is easy")
>>>#type exit when you are done coding on cmd
>>> exit()

C:\Users\acer>