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<a xmlns="" href="mailto:[email protected]">Email</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.2. String</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="type.html">上一页</a> </td><th width="60%" align="center">第 4 章 数据类型</th><td width="20%" align="right"> <a accesskey="n" href="ch04s03.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="string"></a>4.2. String</h2></div></div></div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="str.fun"></a>4.2.1. String function</h3></div></div></div>
<div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="str.find"></a>4.2.1.1. str.find()</h4></div></div></div>
<p>找到字符，返回字符串位置。没有找到返回 -1</p>
<pre class="screen">
"aaa bbb ccc".find('aaa')
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="str.replace"></a>4.2.1.2. str.find()</h4></div></div></div>
<p>查找并替换字符串</p>
<pre class="screen">
a = 'hello word'
a.replace('word','python')
</pre>
</div>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idp18"></a>4.2.2. Convert str to bytes in python</h3></div></div></div>
<pre class="programlisting">
>>> b = str.encode(y)
>>> type(b) >>> b b’Hello World!’
To alter from bytes to str, capitalize on bytes.decode().
>>> z = b”Hello World!”
>>> y = “Hello World!”
>>> type(z)
>>> type(y)
To alter from str to bytes, capitalize on str.encode().
>>> a = bytes.decode(z)
>>> type(a)
>>> a
‘Hello World!’
# to utf-8
'BG7NYT'.encode('utf-8')
# to utf-16
'BG7NYT'.encode('utf-16')
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idp19"></a>4.2.3. String format</h3></div></div></div>
<p>
strHello = "the length of (%s) is %d" %('Hello World',len('Hello World'))
print strHello
</p>
</div>
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