擅长:python、mysql、java
<pre><code>
def answer_eight():
county = census_df[census_df['SUMLEV']==50]
req_col = ['STNAME','CTYNAME']
region = county[(county['REGION']<3) & (county['POPESTIMATE2015']>county['POPESTIMATE2014']) & (county['CTYNAME'].str.startswith('Washington'))]
region = region[req_col]
return region
answer_eight()
</code></pre>