filename = 'observations1.txt'
curline = 44
lines = []
while linecache.getline(filename, curline):
    for i in range(75):
        lines.append(linecache.getline(filename, curline).rstrip())
curline += 1
add_to_observation_log(lines)
curline += 4
lines = []
Quickest way of Importing 500GB Text File taking only the sections wanted