<p>使用控制布尔值来处理用户参与的状态。你知道吗</p>
<p>另外,正如vasilisg所指出的,while循环缩进是不正确的。你知道吗</p>
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<pre class="snippet-code-html lang-html prettyprint-override"><code>import random
controlFlag = True #add boolean control
while controlFlag == True:
print (" \n")
name = input("Please enter your name: ")
pack = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]
random.shuffle(pack)
print ("Welcome {0}! Hope you have fun playing! \n".format(name))
print("Original deck:", pack, "\n")
print (" \n")
for i in range(3):
pack1 = pack[::3]
pack2 = pack[1::3]
pack3 = pack[2::3]
print("1: ", pack1, "\n")
print("2: ", pack2, "\n")
print("3: ", pack3, "\n")
user = input("Pick a number and enter the row it is in: ")
while not (user == "1" or user == "2" or user == "3"):
print(user, " is not a valid answer. Please try again \n")
user = input("Pick a number and enter the row it is in: ")
if user == "1":
pack = pack3 + pack1 + pack2
elif user == "2":
pack = pack1 + pack2 + pack3
elif user == "3":
pack = pack2 + pack3 + pack1
print("The number you are thinking of is:", pack[10], "\n")
answer = input("Would you like to play again (y/n)? ")
if answer == "y":
controlFlag = True # unnecessary, left in for completeness.
elif answer == 'n':
print ("Thank you for playing!")
controlFlag = False
else:
print('wrong choice')
break</code></pre>
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