DataWrangling:Clean,Transform,Merge,Reshape\\CombingandMergingDataSetsDatabasestyleDataFrameMergespandas.merge()函数实现join的功能,除df外无参数的话为naturaljoinpd.merge(dfleft,dfright,on,how,lefton,righton,suffixes[,]…)merge结果的index取自左表,右表的index忽略当关联条件为leftindex或rightindex且index为层次化索引时,另一方的关联条件个数应与层次化索引的层数相同\MergingonIndexes上述merge中,若lef...