擅长:python、mysql、java
<p>可以使用正则表达式:</p>
<pre><code>expression = "1234+567"
sign_index = [m.start() for m in re.finditer(r'[+-/*]', expression)][0]
sign = expression[sign_index]
first_num = int(expression.split(sign)[0])
second_num = int(expression.split(sign)[1])
</code></pre>