为什么我不能用浮点数而不是整数？

Question

import pygame
import random

pygame.init()

# create screen
screen = pygame.display.set_mode((1000, 600))

# Title + Logo
pygame.display.set_caption("Space Invader")
icon = pygame.image.load("chicken.png")
pygame.display.set_icon(icon)

# Player icon
player_icon = pygame.image.load("spaceship.png")
playerX = 400
playerY = 500

player_changeX = 0
player_changeY = 0

# enemy Player
enemy_icon = pygame.image.load("space-invaders.png")
enemyX = random.randint(0, 936)
enemyY = random.randint(-100, -50)

enemy_changeX = random.randint (0.1, 0.5)
enemy_changeY = random.randint (0.1, 0.5)

if enemyY >= 500:
    print("Game over")
    exit()


def player(x, y):
    screen.blit(player_icon, (x, y))


def enemy(x, y):
    screen.blit(enemy_icon, (x, y))


# game loop
running = True
while running:

    # backround colour  RGB
    screen.fill((0, 0, 0))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
            # If key pressed check whether its right or left
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player_changeX = -1
            if event.key == pygame.K_RIGHT:
                player_changeX = 1
            if event.key == pygame.K_UP:
                player_changeY = -1
            if event.key == pygame.K_DOWN:
                player_changeY = 1
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                player_changeX = 0
            if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                player_changeY = 0
    # If player reaches boarder
    if playerX >= 936:
        playerX = 20
    if playerX <= 0:
        playerX = 936
    if playerY <= 0:
        playerY = 0
    if playerY >= 550:
        playerY = 550
    # enemy control
    if enemyX >= 936:
        enemyX = 20
    if enemyX <= 0:
        enemyX = 936
    if enemyY <= 0:
        enemyY = 0
    if enemyY >= 550:
        enemyY = random.randint(-100, -50)

    # Player change in coordinates
    playerX += player_changeX
    playerY += player_changeY

    #enemy change in coordinates
    enemyX += enemy_changeX
    enemyY += enemy_changeY

    #Results
    player(playerX, playerY)
    enemy(enemyX, enemyY)
    pygame.display.update()

我刚开始接触编程，我正在创建一个小游戏，还没有完成，但我遇到一个问题，我想用浮点数代替整数，但不让我用。它还没有完成，但我遇到了一个问题，我想用浮点数代替整数，但它不让我这样做。你能改变这个问题吗，如果可以，怎么改变。我想使用的浮点数在 enemy_changeX 和 Y 中，它给我的错误是 。

第212行，在randrange中， raise ValueError("non-integer arg 1 for randrange()")ValueError: non-integer arg 1 for randrange()

即使我没有线212。

希望这个问题足够准确。

Answer 1

首先，你要求的是一个介于两者之间的整数。0.1 和 0.5由于明显的原因，这是不可能的。

为了获得 float 你可以用 random.uniform(0.1, 0.5).

虽然我在这里必须指出，像素不能是浮动值，因为没有半个像素。因此，你要考虑是否真的需要一个浮动值的像素变化值。