python字符串反转

<span style="color: #008080">1</span> a = <span style="color: #800000">'</span><span style="color: #800000">example</span><span style="color: #800000">'</span>
<span style="color: #008080">2</span> b = a[::-1<span style="color: #000000">]
</span><span style="color: #008080">3</span> <span style="color: #0000ff">print</span><span style="color: #000000">(b)
</span><span style="color: #008080">4</span> <span style="color: #008000">#</span><span style="color: #008000">输出结果'elpmaxe'</span>