擅长:python、mysql、java
<p>可以这样使用<a href="https://pandas.pydata.org/pandas-docs/stable/generated/pandas.melt.html" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>pd.melt(DF, id_vars=['NaN'], var_name='Date', value_name='Price')
NaN Date Price
0 item1 1/1/2018 1
1 item2 1/1/2018 3
2 item1 2/1/2018 2
3 item2 2/1/2018 4
</code></pre>