擅长:python、mysql、java
<p>只要把<code>printCurrency</code>改成<code>formatCurrenty</code>就可以了</p>
<pre><code>def formatCurrency(value):
return "$" + format(value, '.2f') # don't print the value but return it
print("That is %s for this service" % formatCurrenty(cost))
</code></pre>