OTU_contingency_table.py: ValueError: invalid mode: 'rU'

Traceback (most recent call last): File "/media/superdisk/edna/working/MedPorteDNA/snakemake_rapidrun_swarm_metazoa/scripts/OTU_contingency_table.py", line 233, in main() File "/media/superdisk/edna/working/MedPorteDNA/snakemake_rapidrun_swarm_metazoa/scripts/OTU_contingency_table.py", line 205, in main representatives = representatives_parse() ^^^^^^^^^^^^^^^^^^^^^^^ File "/media/superdisk/edna/working/MedPorteDNA/snakemake_rapidrun_swarm_metazoa/scripts/OTU_contingency_table.py", line 31, in representatives_parse with open(representatives_file, "rU") as representatives_file: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ValueError: invalid mode: 'rU'