擅长:python、mysql、java
<p>变量“result”只在函数的作用域中定义。如果要打印出来,应该将performOperation函数的结果赋给result变量。另外,确保在函数中实际返回了一些内容。在</p>
<pre><code>def performOperation(numberOne, numberTwo):
if operation == "+":
result = numberOne + numberTwo
if operation == "-":
result = numberOne - numberTwo
if operation == "*":
result = numberOne * numberTwo
if operation == "/":
result = numberOne / numberTwo
return result
result = performOperation(numberOne, numberTwo)
print str(result) # will print the result
</code></pre>