擅长:python、mysql、java
<p><a href="http://pandas.pydata.org/pandas-docs/stable/indexing.html" rel="nofollow">^{<cd1>}</a>支持基于整数和标签的混合访问。你知道吗</p>
<pre><code>df = pd.DataFrame(np.random.randn(5,3), columns=list('ABC'))
>>> df
A B C
0 -0.473002 0.400249 0.332440
1 -1.291438 0.042443 0.001893
2 0.294902 0.927790 0.999090
3 1.415020 0.428405 -0.291283
4 -0.195136 -0.400629 0.079696
>>> df.ix[[0, 3, 4], ['B', 'C']]
B C
0 0.400249 0.332440
3 0.428405 -0.291283
4 -0.400629 0.079696
df.ix[[0, 3, 4], ['B', 'C']] = 0
>>> df
A B C
0 -0.473002 0.000000 0.000000
1 -1.291438 0.042443 0.001893
2 0.294902 0.927790 0.999090
3 1.415020 0.000000 0.000000
4 -0.195136 0.000000 0.000000
</code></pre>