<pre><code>number="0123,456,789,"
cleanedNumber=''
for i in range(0,len(number)):
if number[i] in '0123456789':
cleanedNumber = cleanedNumber + number[i]
newNumber = int(cleanedNumber)
print("The number is {}".format(newNumber))
</code></pre>
<p>我不明白为什么要使用变量<code>cleanedNumber=''</code>?在</p>