擅长:python、mysql、java
<p>见下文</p>
<pre><code>class Spam:
numInstances = 0
def __init__(self):
Spam.numInstances = Spam.numInstances + 1
def printNumInstances(self):
print("Number of instances created: %s" % Spam.numInstances)
x = Spam()
x.printNumInstances()
</code></pre>