Number conversions using Python: Let's Convert Decimal to Binary, Decimal to Octal, Decimal to Hexadecimal using python. Using python command line argument and python / python 3 Built-in function. 

Python 3 supports a number of different ways of handling command line argument. The Built-in way is to use the sys module. 

Copy this code and save it as a .py file. Now open your terminal or command prompt and run the following command . Make sure you are in the same directory where the .py is.

$ python your_file_name.py decimal_value

Sample Input :

$ python converter.py 100

Sample output :

Decimal value: 100
In Binary: 1100100
In Octal: 144
In Hexadecimal: 64