为什么在使用时间的时候会出现“无”字呢？

Question

import time
import random

print "Wanna play a game?"

raw_input(),\
time.sleep(1)
print ("Think of a number (1-5), I won't see, I promise. \n"),\
    time.sleep(5)

print "You picked? Now write it down."
raw_input(),\
time.sleep(3)

print ("Let me guess... \n"),\
    time.sleep(2)

print ((random.randint(1, 5))), \
    time.sleep(20000)

在终端中运行时，会发生以下情况：

Wanna play a game?

yes
Think of a number (1-5), I won't see, I promise. 
None
You picked? Now write it down.
Let me guess... 
None
1

为什么会弹出“无”

Answer 1

代码中的,\向print语句添加新参数并打印它，在本例中，它是time.sleep()（None）的返回值

去掉这些，固定压痕，它就工作了

import time
import random

print "Wanna play a game?"

raw_input()
time.sleep(1)
print ("Think of a number (1-5), I won't see, I promise. \n")
time.sleep(5)

print "You picked? Now write it down."
raw_input()
time.sleep(3)

print ("Let me guess... \n")
time.sleep(2)

print ((random.randint(1, 5)))
time.sleep(20000)

输出：

Wanna play a game?
y
Think of a number (1-5), I won't see, I promise. 
You picked? Now write it down.
1
Let me guess... 
3