unique.txt file contains: 2 columns with columns separated by tab. total.txt file contains: 3 columns each column separated by tab.

I take each row from unique.txt file and find that in total.txt file. If present then extract entire row from total.txt and save it in new output file.

###Total.txt
column a        column b                    column c         
interaction1    mitochondria_205000_225000  mitochondria_195000_215000   
interaction2    mitochondria_345000_365000  mitochondria_335000_355000    
interaction3    mitochondria_345000_365000  mitochondria_5000_25000      
interaction4    chloroplast_115000_128207   chloroplast_35000_55000    
interaction5    chloroplast_115000_128207   chloroplast_15000_35000    
interaction15   2_10515000_10535000 2_10505000_10525000

###Unique.txt
column a                    column b      
mitochondria_205000_225000  mitochondria_195000_215000        
mitochondria_345000_365000  mitochondria_335000_355000    
mitochondria_345000_365000  mitochondria_5000_25000     
chloroplast_115000_128207   chloroplast_35000_55000    
chloroplast_115000_128207   chloroplast_15000_35000    
mitochondria_185000_205000  mitochondria_25000_45000    
2_16595000_16615000 2_16585000_16605000    
4_2785000_2805000   4_2775000_2795000    
4_11395000_11415000 4_11385000_11405000   
4_2875000_2895000   4_2865000_2885000   
4_13745000_13765000 4_13735000_13755000

My program:

file=open('total.txt')

file2 = open('unique.txt')
all_content=file.readlines()
all_content2=file2.readlines()
store_id_lines = []
ff = open('match.dat', 'w')

for i in range(len(all_content)):
              line=all_content[i].split('\t')
              seq=line[1]+'\t'+line[2]
              for j in range(len(all_content2)):
                     if all_content2[j]==seq:
                           ff.write(seq)
                           break 

Problem:
but istide of giving desire output (values of those 1st column that fulfile the if condition). i nead somthing like if jth of unique.txt == ith of total.txt then write ith row of total.txt into new file.