class FindTRex:
    """Find Trex class."""
    def __init__(self, lst):
        """Initialize attribute"""
        self.lst = lst

    def find_trex(self):
        """Returns True if 'tyrannosaurus' is in self.lst, False if not."""
        return "tyrannosaurus" in self.lst

from statistics import mean
import operator

cases = {
    "Behind Milestone": operator.lt,
    "At Milestone": operator.eq,
    "Beyond Milestone": operator.gt,
}

def compute_progress(trainee, milestone):
    trainee_score = mean(trainee)
    milestone_score = mean(milestone)
    return next(progress for progress, test in cases.items() if test(trainee_score, milestone_score))