2D representation of genomic intervals and their annotations

 A PyRanges object must have the columns Chromosome, Start and
 End. These describe the genomic position and function as implicit row
 labels. A Strand column is optional and adds strand information to the
 intervals. Any other columns are allowed and are considered metadata.
 .
 The structure can be filled from .bed, .bam or .gff files, also from
 tabular or textual representations.