unsafe_eval()

Evaluate a Python expression string and return the result.

Usage

unsafe_eval(expr)

Parses and evaluates the given expression string using Python’s built-in eval() function.

Parameters

expr: str

A string containing a valid Python expression.

Returns

object

The result of evaluating the expression.

Raises

SyntaxError

If the expression string is not valid Python.

NameError

If the expression references undefined names.

Warnings

Never use with untrusted input. This function uses eval() internally and can execute arbitrary Python code. An attacker could craft an expression that deletes files, exfiltrates data, or compromises the system.

Examples

>>> unsafe_eval("2 + 3")
5

>>> unsafe_eval("[i**2 for i in range(5)]")
[0, 1, 4, 9, 16]