擅长:python、mysql、java
<p>如果之前没有定义生命,那么<code>try: lives</code>将始终引导您进入except部分。<br/>
如果在这段代码之前(通过给它赋值)或者在try部分中定义lives,那么您将看到-1在运行。</p>
<pre><code>try:
lives = 1
except NameError:
lives = 6
else:
lives = lives-1
print lives
</code></pre>
<p>将输出0</p>
<p>以及:</p>
<pre><code>lives = 1
try:
lives
except NameError:
lives = 6
else:
lives = lives-1
print lives
</code></pre>
<p>编辑:<br/>
对于您的评论,这里有一些示例代码,它做了一些您可能试图实现的事情,这是一个猜字游戏。希望这对你有帮助。</p>
<pre><code>def main():
# The setup
right_answer = "a"
lives = 6
# The game
while lives > 0:
choice = raw_input("Enter a letter:")
if choice == right_answer:
print "yay, you win!"
break
else:
lives -= 1
print "nay, try again, you have", lives, "lives left"
else:
print "you lose"
# This will call our function and run the game
if __name__ == "__main__":
main()
</code></pre>
<p>**由Python2.7编写,对于Python3,打印需要括号。</p>