Check matrix...

[Ofnuts]

Put the ranges in a list:

ranges=[(1,15) ,(16,30),(31,45),(46,60),(61,75)]

Then when you scan a line, you use the index of the item to retrieve the corresponding element in ranges and compare its value with the two limits.

An even more pythonic way is to:

 iterate lines
    zip(line,ranges)
    iterate result which are (line_item, (min,max)) and compare