eval() Function in Python

Python eval() Function

The eval() function in Python is a built-in function that allows you to evaluate and execute a string as a Python expression or statement. It takes a string as input, which contains a valid Python expression or statement, and then it evaluates and executes that expression.

Here is the basic syntax of the eval() function:

result = eval(expression)

The expression parameter is a string that represents a Python expression or statement. The eval() function will parse and execute this expression. The result of the evaluation will be stored in the result variable.

Here are a few examples to demonstrate the usage of the eval() function:

Evaluating a mathematical expression:

result = eval("2 + 3 * 5")
print(result)  # Output: 17

Evaluating a boolean expression:

result = eval("True and False")
print(result)  # Output: False

Evaluating a function call:

x = 5
result = eval("pow(x, 2)")
print(result)  # Output: 25

It's important to note that the eval() function can execute any valid Python expression or statement, which means it can potentially execute arbitrary code. Therefore, it should be used with caution, especially when accepting user input or evaluating untrusted strings. Using eval() with untrusted input can lead to security vulnerabilities, so it's recommended to use it only with trusted input or in controlled environments.