Counting jump(no of lines) between first two 'String' occurrences in a file

Question

I have a huge data file with a specific string being repeated after a defined number of lines.

counting jump between first two \'Rank\' occurrences. For example the file

Answer 1

counting jump between first two 'Rank' occurrences:

def find_jumps(filename):
    first = True
    count = 0
    with open(filename) as f:
        for line in f:
            if 'Rank' in line:
                if first:
                    count = 0 
                    #set this to 1 if you want to include one of the 'Rank' lines.
                    first = False                    
                else:
                    return count
            else:
                count += 1