书中python2.X的代码：
print "How old are you?",
age = raw_input() #输入38
实现的效果
How old are you? 38 #38紧跟着第一行
书上说在每行print后面加了个逗号（，），print就不会输出换行符而结束这一行跑到下一行去了。
这个逗号不换行的方法在python3中如何实现？？
以下是用python3.X写的ex11：
print("How od are you?")
age = input()
print("How tall are you?")
height = input()
print("How much do you weigh?")
weight = input()
print("So, you're {0} old, {1} tall and {2} heavy.".format(age, height, weight))
希望的效果
How old are you? 38
实际效果
How old are you?
38
age = input("How old are you?")效果图：
print("How old are you?" end="")
python3中print()的原型是
print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)默认输出“\n”，修改掉end的值，让它不输出就可以了