擅长:python、mysql、java
<p>使用由<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.set_index.html" rel="nofollow noreferrer">^{<cd3>}</a>创建的<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.replace.html" rel="nofollow noreferrer">^{<cd1>}</a>by <code>Series</code>:</p>
<pre><code>s = DF2.set_index('Country Code')['Country Name']
DF1['Country Code'] = DF1['Country Code'].replace(s)
print (DF1)
Country Code Population
0 South Africa 100
1 POL 50
</code></pre>