擅长:python、mysql、java
<p>考虑示例访问数据帧<code>df</code></p>
<pre><code>df = pd.DataFrame(
np.random.randint(1, 10, (100, 5)),
pd.Index(['user_{}'.format(i) for i in range(1, 101)], name='user id'),
[
['Number of visits per year'] * 5,
[2012, 2013, 2014, 2015, 2016]
]
)
df.head()
</code></pre>
<p><a href="https://i.stack.imgur.com/FGXRm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FGXRm.png" alt="enter image description here"/></a></p>
<hr/>
<p>{<cd2}你可以用<cd2}参数来应用
另外,由于<code>8</code>的条目代表8次独立的访问,它应该计数8次。我将使用<code>repeat</code>在<code>value_counts</code>之前完成此操作</p>
^{pr2}$
<p><a href="https://i.stack.imgur.com/5bCNU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5bCNU.png" alt="enter image description here"/></a></p>