How can I make camera movements more natural?

I'm struggling to make the camera movements feel more natural. Currently, the camera movements are rigid and don't smoothly follow user input or animations.

Here's a simplified version of my code:

import pygamefrom pygame.locals import *running = Truemouse_down = Falsewhile running:    for event in pygame.event.get((QUIT,MOUSEBUTTONUP,MOUSEBUTTONDOWN)):        if event.type == QUIT:            running = False        elif event.type == MOUSEBUTTONUP:            mouse_down = False        elif event.type == MOUSEBUTTONDOWN:            mouse_down = True            xcoor = pygame.mouse.get_pos()    if mouse_down and (pygame.mouse.get_pos()[0] - xcoor[0] != 0 or pygame.mouse.get_pos()[1] - xcoor[1]):        condition = True        camera[1].z += (pygame.mouse.get_pos()[0] - xcoor[0]) * 0.1        camera[1].y -= (pygame.mouse.get_pos()[1] - xcoor[1]) * 0.1        xcoor = pygame.mouse.get_pos()    else:        condition = False    keys = pygame.key.get_pressed()    if keys[K_LEFT]:        camera[0].x -= 0.1        condition = True    if keys[K_RIGHT]:        camera[0].x += 0.1        condition = True    if keys[K_UP]:        camera[0].z -= 0.1        condition = True    if keys[K_DOWN]:        camera[0].z += 0.1        condition = True    if keys[K_w]:        camera[0].y += 0.1        condition = True    if keys[K_s]:        camera[0].y -= 0.1        condition = True

I initialize the camera position and orientation using a set of vectors and angles. However, when I try to move or rotate the camera, the movements are abrupt and not smooth at all.

What techniques or approaches can I use to improve the fluidity and naturalness of camera movements in my Pygame raytracer? Are there specific algorithms or libraries that would help with this?