list - Counting previous lines using information from two files in python -

i delve explaining programming problem: have 2 files; file #1 gene annotation file , file #2 counts base position file (just trying give context problem).

i want extract "start_codon" position in lines there "+" in column 6, , go position in file#2. instance, want extract 954 column number 3 in file #1 , go row number 954 in file #2. then, want count number of lines above line 954 yield count value of 70 or greater in file #2.

file#1      chromosome  exon    337 774 0.0 -   .   gene_id "a";         chromosome  start_codon 954 956 0.0 +   0   gene_id "b";      chromosome  stop_codon  2502    2504    0.0 +   0   gene_id "b";    file#2  .      .  .      .   942    71  943    63  944    88  945    80  946    80  947    85  948    86  949    97  950    97  951    97  952    104  953    105  954    104  955    108 

my final output file tab-separated file of gene_id followed number of lines yield count value of 70 or greater. example files have given output follows:

 gene_id  count_before_start_codon  b     10 

i want loop through large files produce 1 long output file.

thank you, hope clear. appreciate guidance!

this should work... first part gets gene information in file 1 , populates dictionary second part opens file 2, checks dictionary , produces output.

d={} open("file1.txt","ru") f1:     line in f1:         line=line.rstrip().rsplit("\t")         if line[6]=="+" , line[2]=="start_codon":             d[line[3]] = line[8].rstrip('"')[9]             keys = d.keys()  count=[] results=[] number = 12 open("file2.txt","ru") f2:     line in f2:         line=line.rstrip().rsplit("\t")         if int(line[1]) >= 70:             count.append(line[1])             if line[0] in d:                 results.append(d[line[0]])                 if len(count) > number:                     results.append(str(number))                 else:                     results.append(str(len(count)-1))                 print "\t".join(results)                 count=[]          else:             count=[] 

ps. copy pasted example. edited files tab-delimited. may need play around "slicing"