<p>嗨，我有一个500+行的数据帧。在</p>
<pre><code> company_url company tag_line product data
0 https://angel.co/billguard BillGuard The fastest smartest way to track your spendin... BillGuard is a personal finance security app t... New York City · Financial Services · Security ...
1 https://angel.co/tradesparq Tradesparq The world's largest social network for global ... Tradesparq is Alibaba.com meets LinkedIn. Trad... Shanghai · B2B · Marketplaces · Big Data · Soc...
2 https://angel.co/sidewalk Sidewalk Hoovers (D&B) for the social era Sidewalk helps companies close more sales to s... New York City · Lead Generation · Big Data · S...
3 https://angel.co/pangia Pangia The Internet of Things Platform: Big data mana... We collect and manage data from sensors embedd... San Francisco · SaaS · Clean Technology · Big ...
4 https://angel.co/thinknum Thinknum Financial Data Analysis Thinknum is a powerful web platform to value c... New York City · Enterprise Software · Financia...
</code></pre>
<p>我想做的是在“data”列中找到null并从dataframe中删除行。我为它编写了代码，但我相信它没有像预期的那样工作，因为行数没有改变。有人能帮我吗？在</p>
<p>我的代码：</p>
^{pr2}$
