如何修复这个有语法错误的elif语句。 需要说明[已关闭]

Question

所以，我只是做了这个怪异的程序由于无聊，称为“Flex机器”（它仍在工作），显示一些简单的动画，游戏和； 我一个接一个做的项目。 在第一位，它会询问您是否想要看到它，但是当您说是时，它会在ELIF上显示语法错误。 有人能帮我解决这个问题并解释一下是什么问题引起的吗？

代码:

import pygame
import random
import time

# Begin the Flex
print("Yo! What's Up?")
time.sleep(2)
print("So uh since you have opened this, I will tell you what it's about")
time.sleep(2)
print("My creator got hella bored one day and found himself just scrolling through his phone too much. The only option he had was to create me")
time.sleep(2)
answer = input("So, here I am. Shall we continue? Yes or No ")
if answer == "Yes":
    print("Let's watch this cool animation that my owner gave me!")

    # Snowflake.py
    # Initialize the game engine
pygame.init()
 
BLACK = [0, 0, 0]
WHITE = [255, 255, 255]
BLUE =  [0, 0, 255]
 
# Set the height and width of the screen
SIZE = [400, 400]
 
screen = pygame.display.set_mode(SIZE)
pygame.display.set_caption("Snow Animation")
 
# Create an empty array
snow_list = []
 
# Loop 50 times and add a snow flake in a random x,y position
for i in range(50):
    x = random.randrange(0, 400)
    y = random.randrange(0, 400)
    snow_list.append([x, y])
 
clock = pygame.time.Clock()
 
# Loop until the user clicks the close button.
done = False
while not done:
 
    for event in pygame.event.get():   # User did something
        if event.type == pygame.QUIT:  # If user clicked close
            done = True   # Flag that we are done so we exit this loop
 
    # Set the screen background
    screen.fill(BLACK)
 
    # Process each snow flake in the list
    for i in range(len(snow_list)):
 
        # Draw the snow flake
        pygame.draw.circle(screen, WHITE, snow_list[i], 2)
 
        # Move the snow flake down one pixel
        snow_list[i][1] += 9
 
        # If the snow flake has moved off the bottom of the screen
        if snow_list[i][1] > 400:
            # Reset it just above the top
            y = random.randrange(-50, -10)
            snow_list[i][1] = y
            # Give it a new x position
            x = random.randrange(0, 400)
            snow_list[i][0] = x
 
    # Go ahead and update the screen with what we've drawn.
    pygame.display.flip()
    clock.tick(20)
    pygame.quit()
    
elif answer == "No":
    print("Well, that's fine")
    time.sleep(2)
    print("Cya next time, have a good day")
else:
    print("Please enter yes or no.")

 

Answer 1

检查第一个pygame.init（）到ELIF之间的缩进。

Answer 2

只有当if条件在以上时，您才必须使用elif！ 比如。

if (a == 1):
    //do something
elif (a == 1):
    //do something

你不能这样做:

  elif (a == 1):
    //do something

要解决您的问题，请通过if删除您的第一个elif！

 if answer == "No":
     print("Well, that's fine")
     time.sleep(2)
     print("Cya next time, have a good day")
 else:
     print("Please enter yes or no.")

Answer 3

在代码中，有一个if语句，一个elif语句和一个else语句。 您已经正确缩进了elif和else语句中的代码，但似乎忘记了缩进if语句中的代码。 在python中需要缩进，因此您必须缩进if语句中的代码。

我已经缩进了语句中的代码，所以它现在应该可以正常工作了:

import pygame
import random
import time

# Begin the Flex
print("Yo! What's Up?")
time.sleep(2)
print("So uh since you have opened this, I will tell you what it's about")
time.sleep(2)
print("My creator got hella bored one day and found himself just scrolling through his phone too much. The only option he had was to create me")
time.sleep(2)
answer = input("So, here I am. Shall we continue? Yes or No ")
if answer == "Yes":
    print("Let's watch this cool animation that my owner gave me!")

    # Snowflake.py
    # Initialize the game engine
    pygame.init()
     
    BLACK = [0, 0, 0]
    WHITE = [255, 255, 255]
    BLUE =  [0, 0, 255]
     
    # Set the height and width of the screen
    SIZE = [400, 400]
     
    screen = pygame.display.set_mode(SIZE)
    pygame.display.set_caption("Snow Animation")
     
    # Create an empty array
    snow_list = []
     
    # Loop 50 times and add a snow flake in a random x,y position
    for i in range(50):
        x = random.randrange(0, 400)
        y = random.randrange(0, 400)
        snow_list.append([x, y])
     
    clock = pygame.time.Clock()
     
    # Loop until the user clicks the close button.
    done = False
    while not done:
        for event in pygame.event.get():   # User did something
            if event.type == pygame.QUIT:  # If user clicked close
                done = True   # Flag that we are done so we exit this loop
     
        # Set the screen background
        screen.fill(BLACK)
     
        # Process each snow flake in the list
        for i in range(len(snow_list)):
     
            # Draw the snow flake
            pygame.draw.circle(screen, WHITE, snow_list[i], 2)
     
            # Move the snow flake down one pixel
            snow_list[i][1] += 9
     
            # If the snow flake has moved off the bottom of the screen
            if snow_list[i][1] > 400:
                # Reset it just above the top
                y = random.randrange(-50, -10)
                snow_list[i][1] = y
                # Give it a new x position
                x = random.randrange(0, 400)
                snow_list[i][0] = x
     
        # Go ahead and update the screen with what we've drawn.
        pygame.display.flip()
        clock.tick(20)
        pygame.quit()
    
elif answer == "No":
    print("Well, that's fine")
    time.sleep(2)
    print("Cya next time, have a good day")
else:
    print("Please enter yes or no.")