擅长:python、mysql、java
<p>您可以使用<code>extract</code>:</p>
<pre class="lang-py prettyprint-override"><code>df['country'] = df['country'].str.extract(r'Country:\s*(\w+)')
</code></pre>
<p>熊猫测试:</p>
<pre class="lang-py prettyprint-override"><code>import pandas as pd
import numpy as np
df = pd.DataFrame({'country' : [np.nan, 'Country: America', 'Country France ... More countries...']})
df['country'].str.extract(r'Country:\s*(\w+)')
# 0
# 0 NaN
# 1 America
# 2 NaN
</code></pre>