Question

这是我的代码;

    running = True
    while running:
        print("Open Supply Drop?.")
    answer = input()
    if answer == ("Yes"):
       print("Please wait 3 seconds...")
       import time
      time.sleep(3)
      import random
      callingcard =     ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
      print("You got...")
      print(random.choice(callingcard)

    elif answer == ("yes"):
      print("Please wait 3 seconds...")
      import time
      time.sleep(3)
      import random
      callingcard = ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
      print("You got...")
      print(random.choice(callingcard))
    else:
      print("Please wait 3 seconds...")
      import time`enter code here`
      time.sleep(3)

如果，elif和else有语法错误？我只改变了一些东西，并且工作得非常好，但现在无论如何它都会这样，这是否与缩进有关？

Answer 1

if answer == ("Yes"):
   print("Please wait 3 seconds...")
   import time
  time.sleep(3)
  import random
  callingcard =     ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
  print("You got...")
  print(random.choice(callingcard) # <--You're missing one closing parenthesis here. Try placing the parenthesis to fix the syntax error.

这是您的代码的临时版本：我也猜测IF，ELSE应该在while循环中缩进？

import time
import random
while True:
    print("Open Supply Drop?.")
    answer = input("")
    if answer.upper() == "YES": #.upper() converts the the full string to CAPITAL letters, this allows you to remove all the unnecessary code under elif
       print("Please wait 3 seconds...")
       time.sleep(3)
       callingcard = ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 
       'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 
       'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
       print("You got...")
       print(random.choice(callingcard))
    else:
       print("Please wait 3 seconds...")
       time.sleep(3)}
       break

Answer 2

您的缩进不一致。 Python完全基于缩进语法，你需要在IF，ELIF和ELSE标签下的所有行都有相同的数量。此外，你将有一个无限循环，因为你设置running = True但从未将其设置为其他任何东西。希望有所帮助。

Answer 3

正如已经提到的，你在一条线路上错过了一个人。你有几个问题，所以我写了一个清理版本

导入在文件顶部完成一次
您的常量callingcard列表被拉出循环。它被重写为一个不可变的元组（列表意味着你计划修改）和添加换行符以保持行＆lt; 80个字符
使用break代替while
缩进所有4个空格
代码不会重复，只是为了允许Yes和yes

示例

import time
import random

callingcard = ('BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility',
    'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip',
    'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol')

while True:
    print("Open Supply Drop?.")
    answer = input().lower()
    if answer == "yes":
        print("Please wait 3 seconds...")
        time.sleep(3)
        print("You got...")
        print(random.choice(callingcard))
    else:
        print("Please wait 3 seconds...")
        time.sleep(3)
        break

Answer 4

这很有效。解释如下。

import random
import time
running=True
print("Open Supply Drop?.")
while running:
    answer = input()
    if answer == "Yes":
        print("Please wait 3 seconds...")
        time.sleep(3)
        callingcard =     ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
        print("You got...")
        print(random.choice(callingcard))
    elif answer == "yes":
        print("Please wait 3 seconds...")
        time.sleep(3)
        callingcard = ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
        print("You got...")
        print(random.choice(callingcard))
    else:
        running=False
        print("Please wait 3 seconds...")
        time.sleep(3)

1）为什么import在每个if/elif/else语句中import位于顶部一次。那很好。

2）语法错误似乎也是由于混合制表符和缩进的空格。空格是缩进的首选方法。基本上我改变并检查你的每个缩进，以摆脱语法错误。

查看Tabs or Whitespaces?

3）更改running=False的值，如果是/是，则不是answer

但是你真的不需要另一个elif。因为这与你的if完全相同。 您可以改为：

import random
import time
running=True
print("Open Supply Drop?.")
while running:
    answer = input()
    if answer.lower() == "yes":
        print("Please wait 3 seconds...")
        time.sleep(3)
        callingcard =     ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
        print("You got...")
        print(random.choice(callingcard))
    else:
        running=False
        print("Please wait 3 seconds...")
        time.sleep(3)
        print('Exit')

使用lowercase将所有字符转换为lower()并仅使用yes进行检查即可。

输出：

Open Supply Drop?.
Yes
Please wait 3 seconds...
You got...
C12Patrol
YES
Please wait 3 seconds...
You got...
TitanSandstorm
yes
Please wait 3 seconds...
You got...
TitanicCanyon
yEs
Please wait 3 seconds...
You got...
AsteroidMines
no
Please wait 3 seconds...
Exit

为什么我使用IF，ELIF和ELSE会出现语法错误？

4 个答案: