擅长:python、mysql、java
<p>如果逗号(<code>,</code>)是分隔符,只需对字符串使用<a href="https://docs.python.org/3.6/library/stdtypes.html#str.split" rel="noreferrer">^{<cd2>}</a>,然后对结果使用<a href="https://docs.python.org/3.6/library/functions.html#len" rel="noreferrer">^{<cd3>}</a>:</p>
<pre><code>text = 'LN1 2DW, DN21 5BJ, DN21 5B'
number = len(text.split(','))
</code></pre>
<p>还可以重用元素列表。例如:</p>
<pre><code>text = 'LN1 2DW, DN21 5BJ, DN21 5B'
tags = text.split(',')
number = len(tags)
#do something with the `tags`
</code></pre>