如何使用Python中的内存管理技巧优化代码性能

# 代码示例1：创建不必要的对象
def sum_of_list(nums):
    total = 0
    for num in nums:
        total += num
    return total

nums = [1, 2, 3, 4, 5]
result = sum_of_list(nums)

# 代码示例2：优化创建对象
def sum_of_list(nums):
    total = 0
    for i in range(len(nums)):
        total += nums[i]
    return total

nums = [1, 2, 3, 4, 5]
result = sum_of_list(nums)

# 代码示例3：使用生成器
def generate_numbers(n):
    for i in range(n):
        yield i

numbers = generate_numbers(1000000)

# 代码示例4：使用内置的数据结构
def count_duplicates(nums):
    # 使用set去除重复元素
    unique_nums = set(nums)
    # 使用计数字典
    counts = {}
    for num in nums:
        if num in counts:
            counts[num] += 1
        else:
            counts[num] = 1
    # 统计重复元素个数
    duplicates = 0
    for count in counts.values():
        if count > 1:
            duplicates += 1
    return duplicates

nums = [1, 2, 3, 4, 1, 2, 5, 6, 3]
result = count_duplicates(nums)