擅长:python、mysql、java
<p>我对<code>.map()</code>不太熟悉,所以下面是我的方法(这可能在计算上要贵一些):</p>
<p><code>df['COUNT'] = None
locations = {location: to_divide_by, location2: to_divide_by2} # and so on
for index, row in df.iterrows():
df['COUNT'][index] = row['COUNT'] / locations[row['LOCATION']]</code></p>