本人非计算机专业，最近在学python，用的是《笨办法学python》这个教材，在练习11里有道习题：
print "How old are you?",
age = raw_input()
print "How tall are you?",
height = raw_input()
print "How much do you weigh?",
weight = raw_input()
print "So, you're %r old, %r tall and %r heavy." % ( age, height, weight)
语气的结果应该是：
python ex11.py
How old are you? 35
How tall are you? 6'2"
How much do you weigh? 180lbs
So, you're '35' old, '6\'2"' tall and '180lbs' heavy.
可我实际做出来的结果，前面都对，只有最后一条，显示的是：
So, you're '' old, '' tall and '' heavy.
为什么具体的数字不能被显示出来？但是如果我将最后一句改成：
print "So, you're %r old, %r tall and %r heavy." % ( 35, 180,180)
数字能正常显示，请问问题到底出在哪里？
print "How old are you?",
age = raw_input()
print "How tall are you?",
height = raw_input()
print "How much do you weigh?",
weight = raw_input()
print "So, you're %r old, %r tall and %r heavy." % ( age, height, weight)
语气的结果应该是：
python ex11.py
How old are you? 35
How tall are you? 6'2"
How much do you weigh? 180lbs
So, you're '35' old, '6\'2"' tall and '180lbs' heavy.
可我实际做出来的结果，前面都对，只有最后一条，显示的是：
So, you're '' old, '' tall and '' heavy.
为什么具体的数字不能被显示出来？但是如果我将最后一句改成：
print "So, you're %r old, %r tall and %r heavy." % ( 35, 180,180)
数字能正常显示，请问问题到底出在哪里？
