擅长:python、mysql、java
<p>“return”语句结束一段代码。因此,repr()函数只运行一次。相反,可以将其附加到字符串并在for循环后返回,如下所示:</p>
<pre><code>class NimGame:
def __init__(self, listOfNumBalls):
self.listOfNumBalls = listOfNumBalls
def __repr__(self):
returnval = ""
for num in range(len(self.listOfNumBalls)):
returnval += "Heap {}: {} balls".format(num + 1,self.listOfNumBalls[num]) + "\n"
return returnval
</code></pre>
<p>这将显示打印时的预期输出。你知道吗</p>