擅长:python、mysql、java
<p>尝试在以下时间之前融化数据帧:</p>
<pre class="lang-py prettyprint-override"><code>df.melt().value.value_counts()
# 0 4
# 1 3
# 2 1
# 3 1
</code></pre>
<p>一个简单的方法是:</p>
<pre class="lang-py prettyprint-override"><code>
unique, counts = np.unique(df.values.ravel(), return_counts=True)
counts_df = pd.DataFrame({"counts":counts}, index=unique)
# counts
# 0 4
# 1 3
# 2 1
# 3 1
</code></pre>