code: def mate(self, other):
          "Return a new individual crossing self and other."
          c = random.randrange(len(self.genes))
          return self.__class__(self.genes[:c] + other.genes[c:]f mate(self, other):
          "Return a new individual crossing self and other."
          c = random.randrange(len(self.genes))
          return self.__class__(self.genes[:c] + other.genes[c:])
docs: Return a new individual crossing self and other.