有如下一个data frame:
item_id review_text
B0006SIBUC i was attracted to this
B0009VEM4U great snippers
...
B0006SIBUC i am enjoying using these
我现在想把同一个商品的评价全部放在一起，大概是这样：
item_id review_text
B0006SIBUC i was attracted to this i am enjoying using these
B0009VEM4U great snippers
...
请问如何可以做到这样呢？谢谢！
df = df.groupby('item_id').agg(' '.join).reset_index()