text: #!/usr/bin/env python3
  
  import sys
  import pyslim
  
  treefile = sys.argv[1] 
  
  ts = pyslim.load(treefile)
  print(f"The file '{treefile}' has {ts.num_trees} trees relating {ts.num_individuals} individuals "
        f"with {ts.num_mutations} mutations at {ts.num_sites} sites.")
  