Python eval() built-in function
From the Python 3 documentation
The arguments are a string and optional globals and locals. If provided, globals must be a dictionary. If provided, locals can be any mapping object.
Introduction
The eval() function in Python is a built-in function that parses a string as a Python expression and evaluates it. It can be used to execute arbitrary Python code from a string, which can be both powerful and risky. It’s often used in situations where you need to evaluate dynamically generated expressions, but it should be used with caution due to potential security vulnerabilities.
Examples
>>> eval('1 + 4')
# 5
>>> eval('print("Hello World!")')
# Hello World!
>>> x = 10
>>> eval('x == 10')
# True
The eval() function can also be used with the print() function to display output to the console.