how to check which key is pressed in pygame code example

Example 1: check key pressed pygame

import pygame
events = pygame.event.get()
for event in events:
    if event.type == pygame.KEYDOWN:
        if event.key == pygame.K_LEFT:
            location -= 1
        if event.key == pygame.K_RIGHT:
            location += 1

Example 2: pygame.key.get_pressed()

if pygame.mouse.get_pressed()[0]:
	# do something when the left mouse button is pressed
keys = pygame.key.get_pressed()
if keys[pygame.K_a]:
	# do something when the a key is pressed

Example 3: pygame keydown

for event in pygame.event.get():
	if event.type == pygame.KEYDOWN:
    	return True