如何使用 id 连接数据帧行中的字符串？

Question

这是我的数据集的一个示例。

d={'Report id': [0, 0, 1, 1], 'sentences': ['There is also a faint ground glass nodule. ', 'Other two ill  defined, small ground glass lesions are seen.', 'There is a small nodule at medial aspect of left breast, measured 11 mm in size.', 'Two heterogeneous enhancing lesions at lateral segment of left lobe']}
df1 = pd.DataFrame(data=d)

我想根据从 0 开始的报告 id 连接数据框的行。如果行具有相同的报告 id，则应将其连接成一行。以下是我的预期输出。

dd = {'Report id': [0, 1], 'sentences': ['There is also a faint ground glass nodule. ' 'Other two ill  defined, small ground glass lesions are seen.', 'There is a small nodule at medial aspect of left breast, measured 11 mm in size.' 'Two heterogeneous enhancing lesions at lateral segment of left lobe']}
df2 = pd.DataFrame(data=dd)

我试图像这样加入或连接。请帮忙！

res = pd.concat(df["sentences"], on=['Report id'])

Answer 1

将groupby 与apply 一起使用

例如：

d={'Report id': [0, 0, 1, 1], 'sentences': ['There is also a faint ground glass nodule. ', 'Other two ill  defined, small ground glass lesions are seen.', 'There is a small nodule at medial aspect of left breast, measured 11 mm in size.', 'Two heterogeneous enhancing lesions at lateral segment of left lobe']}
df1 = pd.DataFrame(data=d)
print(df1.groupby('Report id')['sentences'].apply(" ".join))

输出：

Report id
0    There is also a faint ground glass nodule.  Ot...
1    There is a small nodule at medial aspect of le...
Name: sentences, dtype: object