先看代码：

import time #利用import

print "how",

time.sleep(2) #sleep()方法前面必须得有导入模块的名字time

print "are",

time.sleep(2)

print "you",

time.sleep(2)

print "today?"

from time import sleep #利用from...import...

print "how",

sleep(2) #sleep()方法前面就不要有导入模块的名字了

print "are",

sleep(2)

print "you",

sleep(2)

print "today?"

结果

how are you today?

how are you today?

区别我在代码中的注释部分已经写出了。