Calculation of an expression in Python (super simple)

The process of running is as follows:

Input calculation expression: 3+5

Calculation Result: 8

The calculation expression is then displayed again, waiting for the input to complete, to display the result again, depending on the loop.

As a beginner again, however, the code is simple, as shown below:

#!/usr/bin/env Python3
#coding =utf-8
Import OS
    
    If
        
            result = eval (dynamic.  Lstrip(). Rstrip ("=
            Print
        
            Print
    Else
        
        OS. System (Command)

Calculation of an expression in Python (super simple)