def venn(vennset=(1,1,1,1,1,1,1), venncolor=('#00909e', '#f67280', '#ff971d'), vennalpha=0.5,
         vennlabel=('A', 'B', 'C')):
    fig = plt.figure()
    if len(vennset) == 7:
        venn3(subsets=vennset, set_labels=vennlabel, set_colors=venncolor, alpha=vennalpha)
        plt.savefig('venn3.png', format='png', bbox_inches='tight', dpi=300)
    elif len(vennset) == 3:
        venn2(subsets=vennset, set_labels=vennlabel, set_colors=venncolor, alpha=vennalpha)
        plt.savefig('venn2.png', format='png', bbox_inches='tight', dpi=300)
    else:
        print("Error: check the set dataset")