擅长:python、mysql、java
<pre><code>def answer_eight():
df=census_df[census_df['SUMLEV']==50]
#df=census_df
df=df[(df['REGION']==1) | (df['REGION']==2)]
df=df[df['CTYNAME'].str.startswith('Washington')]
df=df[df['POPESTIMATE2015'] > df['POPESTIMATE2014']]
df=df[['STNAME','CTYNAME']]
print(df.shape)
return df.head(5)
</code></pre>