问NetworkX -允许重复节点

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import networkx as nx
import matplotlib.pyplot as plt


G = nx.DiGraph()


def calculate_lists(user_input):
    """ Calculates the number of occurences of certain character in a string."""
    input_list = []
    for i in user_input:
        input_list.append(i)

    occurence_list = []
    for i in set(input_list):
        occurence_list.append((i, user_input.count(i)))

    sorted_by_first = sorted(occurence_list, key=lambda tup: tup[1])
    sorted_list = list(reversed(sorted_by_first))

    propability_list = []
    for i in range(len(sorted_list)):
        propability_list.append(sorted_list[i][1])

    print("Input list is: ", input_list)
    print("Input list is: ", input_list)
    print("Occurence list: ", occurence_list)
    print("Sorted list is: ", sorted_list)
    print("Probility list is: ", propability_list)
    return huffmann_algorithm(propability_list)


def huffmann_algorithm(prob_list):
    node_list = []
    while len(prob_list) != 1:
        first_minimum = min(float(s) for s in prob_list)
        print("First minimum", first_minimum)
        prob_list.remove(first_minimum)
        second_minimum = min(float(s) for s in prob_list)
        print("Second minimum", second_minimum)
        prob_list.remove(second_minimum)
        node_list.append([first_minimum, second_minimum])
        print("new value: ", first_minimum+second_minimum)
        new_value = int(first_minimum+second_minimum)
        prob_list.append(new_value)
    print("Finished: ", prob_list)
    count = 0
    for i in node_list:
        print(count)
        print("Nodes: ", tuple(i))
        G.add_node(i[0])
        G.add_node(i[1])
        G.add_node(i[0]+i[1])
        G.add_edge(i[0], i[0]+i[1])
        G.add_edge(i[1], i[0]+i[1])
    print("Node list: ", node_list)
    print(G.nodes())
    nx.draw_networkx(G, with_labels=True, arrows=False)
    plt.savefig("graph1.png")
    plt.show()


def main():
    user_input = str(input("Please enter a text: "))
    calculate_lists(user_input)


if __name__ == "__main__":
    main()