python - Pandas: Join dataframes on selected columns -

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i have 2 data frames following 

 data set  id type   msg   1  high   lets  2  low    whats   3  medium thats   data set b   id  accounttype  2   facebook  3   linkedin

how can updated table of join in pandas, should 

updated dataseta   id account    type  msg  1            high   lets  2  facebook  low    whats   3  linkedin  medium thats

i can in sql update , inner join, how perform in pandas, tried it, of operations append/ merge. appreciated

try this:

 df4  #   id    type      msg  #   0   1    high   letsdo  #   1   2     low  whatsit  #   2   3  medium  thatsit  df3:   #          id accounttype  xxx  #       0   2    facebook   24  #       1   3    linkedin   44     df4.merge(df3[['id','accounttype']],how='left').fillna("")  #    id    type      msg accounttype # 0   1    high   letsdo             # 1   2     low  whatsit    facebook # 2   3  medium  thatsit    linkedin

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