我有 2 个数据框，格式如下：
df_search
SEARCH
part1
anotherpart
onemorepart
df_all
FILE EXTENSION PATH
part1_1 .prt //server/folder1/part1_1
part1_2 .prt //server/folder2/part1_2
part1_2 .pdf //server/folder3/part1_2
part1_3 .prt //server/folder2/part1_3
anotherpart_1 .prt //server/folder1/anotherpart_1
anotherpart_2 .prt //server/folder3/anotherpart_2
anotherpart_3 .prt //server/folder2/anotherpart_3
anotherpart_3 .cgm //server/folder1/anotherpart_3
anotherpart_4 .prt //server/folder3/anotherpart_4
onemorepart_1 .prt //server/folder2/onemorepart_1
onemorepart_2 .prt //server/folder1/onemorepart_2
onemorepart_2 .dwg //server/folder2/onemorepart_2
onemorepart_3 .prt //server/folder1/onemorepart_3
onemorepart_4 .prt //server/folder1/onemorepart_4
完整的 df_search 有 15,000 个项目。df_all 有 550,000 个项目。我正在尝试根据文件字符串中的搜索项字符串合并两个数据框。我想要的输出是这样的：
SEARCH FILE EXTENSION PATH
part1 part1_1 .prt //server/folder1/part1_1
part1 part1_2 .prt //server/folder2/part1_2
part1 part1_2 .pdf //server/folder3/part1_2
part1 part1_3 …