您的示例是Python 2,它是Python的旧版本可能你用的是版本3。python 3的变体是:

print("How old are you?", end=' ')
age = input()
print("How tall are you?", end=' ')
height = input()
print("How much do you weigh?", end=' ')
weight = input()
print("So, you're %r old, %r tall and %r heavy." % (age, height, weight))