pandas: records with lists to separate rows

Question

I have a Python Pandas DataFrame like this (UCSC schema for NCBI RefSeq):

chrom   exonStart     exonEnds      name
chr1    100,200,300   110,210,310   gen1
c         


        

Answer 1

I come up with this , by usingunstack and stack

df.set_index(['chrom','name']).apply(lambda x : x.str.split(','),1).\
   stack().apply(pd.Series).stack().unstack(-2).\
       reset_index().drop('level_2',1)
Out[1201]: 
  chrom  name exonStart exonEnds
0  chr1  gen1       100      110
1  chr1  gen1       200      210
2  chr1  gen1       300      310
3  chr1  gen2       500      600
4  chr1  gen2       700      800
5  chr2  gen3        50       55
6  chr2  gen3        60       65
7  chr2  gen3        70       75
8  chr2  gen3        80       85