擅长:python、mysql、java
<p>不同的方法</p>
<pre><code>id = ['userid1', 'userid2', 'userid3']
ndarray1 = [1, 2, 3, 4]
ndarray2 = [1, 2, 3, 4]
ndarray3 = [1, 2, 3, 4]
concat = [ndarray1, ndarray2, ndarray3]
n = []
user = []
for i in range(len(concat)):
for j in range(len(concat[i])):
user.append(id[i])
n.append(concat[i][j])
df = pd.DataFrame(data=[n, user]).T
df.columns = ['id', 'value']
</code></pre>