：``%r`` 用作 debug，``%s`` 用作显示。
print ("How old are you?",)
age = input()
print ("How tall are you?",)
height = input()
print("how much do you weigh?",)
weight = input()
print ("So, you're %r old, %r tall and %r heacy."
% (age, height, weight))
# 打印出来后我的字符串前面有个 u ，像 u'35' 这样。
# 它表示 Python 告诉你你的字符串是 unicode。使用 %s 就一切正常了
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