code: def main():
      target_string = "Genetic Algorithm"
      population_size = 100
      mutation_rate = 0.05
      genetic_algorithm = GeneticAlgorithm(
          target_string, population_size, mutation_rate
      )
  
      print("")
      print("+--------+")
      print("|   GA   |")
      print("+--------+")
      print(
          "Description: Implementation of a Genetic Algorithm which aims to produce"
      )
      print(
          "the user specified target string. This implementation calculates each"
      )
      print(
          "candidate's fitness based on the alphabetical distance between the candidate"
      )
      print(
          "and the target. A candidate is selected as a parent with probabilities proportional"
      )
      print(
          "to the candidate's fitness. Reproduction is implemented as a single-point"
      )
      print(
          "crossover between pairs of parents. Mutation is done by randomly assigning"
      )
      print("new characters with uniform probability.")
      print("")
      print("Parameters")
      print("----------")
      print("Target String: '%s'" % target_string)
      print("Population Size: %d" % population_size)
      print("Mutation Rate: %s" % mutation_rate)
      print("")
  
      genetic_algorithm.run(iterations=1000)
  
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types