python string reverse

str type python does not have a reverse function.

However, by stepping through the slices in reverse, we can efficiently reverse a string.

Only English characters are supported.

example:

<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>

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