Executing String Code Using exec()

In this section, we will demonstrate how to execute Python code stored in a string using the built-in exec() function.

Example 1: Using the Built-in exec() Method

def exec_code(): 
    # Defining code as a string
    LOC = """ 
def factorial(num): 
    fact = 1 
    for i in range(1, num + 1): 
        fact = fact * i 
    return fact 

# Printing the factorial of 5
print(factorial(5)) 
"""
    # Executing the string code using exec()
    exec(LOC) 

# Call the function to execute the code
exec_code()

Output:

120

In this example, the string contains the definition of a function that calculates the factorial of a number. When exec() is called, it executes this code as if it were written directly in the script.

This is useful for dynamically running Python code from a string.