擅长:python、mysql、java
<p>我认为最接近的<code>'at the same time'</code>是由<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.loc.html" rel="nofollow noreferrer">^{<cd2>}</a>和{a2}选择的:</p>
<pre><code>print (df.index.difference(['Unknown']))
Index(['Female', 'Male'], dtype='object')
print (df.columns.difference(['Unknown']))
Index(['Female', 'Male'], dtype='object')
df = df.loc[df.index.difference(['Unknown']), df.columns.difference(['Unknown'])]
print (df)
Victim Sex Female Male
Perpetrator Sex
Female 10850 37618
Male 99354 299781
</code></pre>