如何根据字符串出现在元素中的实例数对字符串数组进行排序？

def sort_strings_by_instance_count(str_array):
    # 创建字典
    count_dict = {}
    
    # 统计每个字符串的出现次数
    for string in str_array:
        if string in count_dict:
            count_dict[string] += 1
        else:
            count_dict[string] = 1
    
    # 将字典转化为元组列表
    count_list = [(string, count) for string, count in count_dict.items()]
    
    # 自定义比较函数，根据计数进行比较
    def compare_func(item):
        return item[1]
    
    # 根据计数进行排序
    sorted_list = sorted(count_list, key=compare_func, reverse=True)
    
    # 返回排序后的字符串数组
    sorted_array = [item[0] for item in sorted_list]
    return sorted_array