擅长:python、mysql、java
<p>示例数据帧:</p>
<pre><code> 0 1 2
0 123 2020 1
1 234 2020 2
2 543 2020 1
</code></pre>
<pre class="lang-py prettyprint-override"><code># For all unique years
for y in df[1].unique():
# For all unique months
for m in df[2].unique():
# Get the row based on the month
row = df.loc[df[2] == m]
# Print only the desired column
print(row[0])
</code></pre>
<p>输出:</p>
<pre><code>0 123
2 543
Name: 0, dtype: int64
1 234
Name: 0, dtype: int64
</code></pre>