通过困难的方式学习Python练习11

Question

我正在努力完成学习Python的练习11，但遇到了一些问题。下面是我使用geedit在.py文件中输入的内容(在PC上工作)

print "How old are you?",
age = raw_input('27')
print "How tall are you?",
height = raw_input('5\'8"')
print "How much do you weigh?",
weight = raw_input('180lbs')
print "So, you're %r old, %r tall and %r heavy." %(age, height, weight) 

我无法让%r显示原始输入，并且它们往往在最后一行显示为'‘，我做错了什么？

Answer 1

raw_input's argument用作提示符的文本。

你可以这样做：

age = raw_input("How old are you? ")
height = raw_input("How tall are you? ")
weight = raw_input("How much do you weigh? ")

print "So, you're %r old, %r tall and %r heavy." % (age, height, weight)

如果你想提供默认值，你可以这样做：

age = raw_input("How old are you? ")
height = raw_input("How tall are you? ")
weight = raw_input("How much do you weigh? ")

age = age if age is not '' else '27'
height = height if height is not '' else '5\'8"'
weight = weight if weight is not '' else '180lbs'

print "So, you're %r old, %r tall and %r heavy." % (age, height, weight)

Answer 2

我认为您可能误解了raw_input的行为。raw_input('27')的意思是“打印27，然后等待用户输入”。27不是默认值，它只是一个提示符。如果您没有键入任何内容就按enter，那么age的值将是''，而不是'27'。

Answer 3

我想这就是你想要的样子？

  1 print "How old are you?",
  2 
  3 age = raw_input()
  4 
  5 print "How tall are you?",
  6 
  7 height = raw_input()
  8 
  9 print "How much do you weigh?",
 10 
 11 weight = raw_input()
 12 
 13 print "So, you're %d old, %s tall and %d heavy." %(age, height, weight)