在我的问题中，我有两个要比较的数据集。这是2个数据框：
nodeid res_time_start_s res_time_end_s
195 291 1.505362e+09 1.505362e+09
390 296 1.503123e+09 1.503123e+09
391 296 1.503145e+09 1.503145e+09
413 296 1.511742e+09 1.511742e+09
414 296 1.511742e+09 1.511742e+09
471 297 1.503145e+09 1.503145e+09
472 297 1.504822e+09 1.504822e+09
484 297 1.511742e+09 1.511742e+09
549 304 1.505470e+09 1.505470e+09
552 304 1.506010e+09 1.506010e+09
nodeid res_time_start_s res_time_end_s
195 291 1.505362e+09 1.505362e+09
390 296 1.503123e+09 1.503123e+09
391 296 1.503145e+09 1.503145e+09
413 296 1.511742e+09 1.511742e+09
414 296 1.511742e+09 1.511742e+09
471 297 1.503145e+09 1.503145e+09
472 297 1.504822e+09 1.504822e+09
484 297 1.511742e+09 1.511742e+09
549 304 1.505470e+09 1.505470e+09
552 304 1.506010e+09 1.506010e+09
553 304 1.506031e+09 1.506031e+09
554 304 1.506053e+09 1.506053e+09
555 304 1.506053e+09 1.506053e+09
556 304 1.506096e+09 1.506096e+09
557 304 1.506096e+09 1.506096e+09
558 304 1.506312e+09 1.506312e+09
559 304 1.506312e+09 1.506312e+09
560 304 1.506334e+09 1.506334e+09
561 304 1.506399e+09 1.506399e+09
562 304 1.506442e+09 1.506442e+09
563 304 1.506442e+09 1.506442e+09
564 304 1.506485e+09 1.506485e+09
565 304 1.506507e+09 1.506507e+09
2059 568 1.519189e+09 1.519189e+09
2082 569 1.518131e+09 1.518131e+09
我想检查第二个数据帧中是否有第一个数据帧的行，如果有，请获取第二个数据帧中该行的索引并将其附加到数组中。 有什么想法吗？
答案 0 :(得分：1)
将DataFrame.merge与DataFrame.reset_index一起使用，以避免删除索引：
a = df1.merge(df2.reset_index())['index'].tolist()
print (a)
[195, 390, 391, 413, 414, 413, 414, 471, 472, 484, 549, 552]