当数组中有重复的值时，如何返回每个双精度数的秩？

def calculate_ranks(arr):
    sorted_arr = sorted(arr)
    rank_dict = {}
    
    for i, num in enumerate(sorted_arr):
        if num not in rank_dict:
            rank_dict[num] = [i]
        else:
            rank_dict[num].append(i)
    
    ranks = []
    for num, indices in rank_dict.items():
        if len(indices) == 1:
            ranks.append(indices[0])
        else:
            ranks.extend([index + 1 for index in indices])
    
    return ranks

# 示例用法
arr = [3.14, 2.71, 3.14, 1.41, 2.71]
ranks = calculate_ranks(arr)
print(ranks)