Pandas: convert unicode strings to string
<p>I have data frame and there are 2 columns with unicode value. I need to convert it to string. I try <code>df.domain.astype(str)</code> but it return unicode strings.
How can I do that?
Data looks like (I need to convert either columns)</p>

<pre><code>domain       search_term
vk.com           None
facebook.com     None
yandex.ru        снять квартиру
locals.ru        None
yandex.ru        снять квартиру без посредников в Москве
avito.ru         None
</code></pre>