2d - How can I rotate my character so that he is facing the mouse?

I just want to preface this by saying I am very new to pygame.

At the moment I have calculated the angle that I need to apply to my character so he can rotate but I am unsure how to actually make him rotate (I understand the principle of it but not how to code it). I have tried to watch videos and look at other questions on here but I have only seen lots of different solutions that I can't implement into my own code.

I want to make it so that my character faces wherever my mouse is moving.

import pygame
import math
from random import randint

pygame.init()


screen = pygame.display.set_mode((600, 600))
screen_width = 600
screen_height = 600
pygame.display.set_caption("Mousey")
char = pygame.image.load('76011.png')
background = pygame.image.load('pygameback.png')
clock = pygame.time.Clock()


class Player:

    def __init__(self, x, y, width, height):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.velocity = 12.5
        self.original = pygame.image.load('76011.png')
        self.rotated = self.original
        self.rect = self.rotated.get_rect()
        self.angle = 0


    def draw(self, win):
        screen.blit(char, (self.x, self.y))



class Enemy(Player):
    def __init__(self, x, y, width, height):
        Player.__init__(self, x, y, width, height)


    def draw(self, win):
        pygame.draw.rect(win, (0, 255, 0), (jeff.x, jeff.y, jeff.width, jeff.height))


def drawWindow():
    screen.blit(background, (0, 0))
    mag.draw(screen)
    jeff.draw(screen)
    pygame.display.update()



def XOR(a, b):
    if bool(a) != bool(b):
        return True
    return False


mag = Player(300, 300, 60, 60)
jeff = Enemy(180, 180, 60, 60)
run = True

while run:
    clock.tick(40)

    keys = pygame.key.get_pressed()

    for e in pygame.event.get():
        if e.type == pygame.QUIT:
            run = False
        if e.type == pygame.MOUSEBUTTONDOWN:
            mouse_x, mouse_y = pygame.mouse.get_pos()


        if e.type == pygame.MOUSEMOTION:
            mouse_x, mouse_y = pygame.mouse.get_pos()
            rel_x, rel_y = mouse_x - mag.x, mouse_y - mag.y
            angle = math.atan2(rel_y, rel_x)


    if XOR(keys[pygame.K_a], keys[pygame.K_LEFT]) and mag.x > mag.velocity:
        mag.x -= mag.velocity
        right = False

        left = True
    elif XOR(keys[pygame.K_d], keys[pygame.K_RIGHT]) and mag.x < screen_height - mag.width - mag.velocity:
        mag.x += mag.velocity
        right = True
        left = False
    elif XOR(keys[pygame.K_w], keys[pygame.K_UP]) and mag.y > mag.velocity:
        mag.y -= mag.velocity
        right = False
        left = False
    elif XOR(keys[pygame.K_s], keys[pygame.K_DOWN]) and mag.y < screen_height - mag.height - mag.velocity:

        mag.y += mag.velocity
        right = False
        left = False

    drawWindow()

I was also confused about where I need to make the character rotate. By this I mean, do I make a method inside the class that calculates the angle and makes the character rotate OR do I do all the calculations down where they are now?