从if语句更改整数值不起作用？ （蟒蛇）

Question

Python newb here。我正在寻找一个if语句，它根据输入改变一个整数值，然后循环代码。不幸的是，我有两个问题：

1. 当亮度打印机接受输入后，该值 无论输入（-10，+ 10，设置为0等）
，打印都是100
2. 无论用户输入的值是什么，都会打印else语句 匹配if语句。

我在这里做错了什么？

# -*- coding: utf-8 -*-

var = 1
brightness = 100

while var == 1 :  # This constructs an infinite loop

  print 'Brightness is ', brightness

  test1 = raw_input('up, down, on or off? ')

  if test1 == 'up':
     brightness = brightness + 10
     print brightness
  if test1 == 'down':
     brightness = brightness - 10
     print brightness
  if test1 == 'on':
     brightness = 100
     print brightness
  if test1 == 'off':
     brightness = 0
     print brightness
  else:
     print 'Try again'

print "Good bye!"

Answer 1

var = 1
brightness = 100

while var == 1 :  # This constructs an infinite loop

print 'Brightness is ', brightness

test1 = raw_input('up, down, on or off? ')

if test1 == 'up':
    brightness = brightness + 10
    print brightness
elif test1 == 'down':
    brightness = brightness - 10
    print brightness
elif test1 == 'on':
    brightness = 100
    print brightness
elif test1 == 'off':
    brightness = 0
    print brightness
else:
    print 'Try again'

print "Good bye!"

Answer 2

Andrew L.和Kalpesh Dusane回答了这个问题，谢谢!!!

我需要交换我的if for elif（否则如果）。

# -*- coding: utf-8 -*-

var = 1
brightness = 100

while var == 1 :  # This constructs an infinite loop

  print 'Brightness is ', brightness

  test1 = raw_input('up, down, on or off? ')

  if test1 == 'up':
     brightness = brightness + 10
     print brightness
  elif test1 == 'down':
     brightness = brightness - 10
     print brightness
  elif test1 == 'on':
     brightness = 100
     print brightness
  elif test1 == 'off':
     brightness = 0
     print brightness
  else:
     print 'Try again'

print "Good bye!"

代码很棒，谢谢！