擅长:python、mysql、java
<p>使用<a href="https://docs.python.org/3/library/itertools.html#itertools.chain.from_iterable" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>from itertools import chain
df = pd.DataFrame({'ind': [['C'], ['C'], ['C'], ['C'], ['E'], ['E']]})
res = ''.join(chain.from_iterable(df['ind']))
print(res)
CCCCEE
</code></pre>