为每个for循环创建新列表

# 创建一个新列表，其中包含原始列表中每个元素的平方
original_list = [1, 2, 3, 4, 5]
squared_list = [x**2 for x in original_list]
print(squared_list)  # 输出: [1, 4, 9, 16, 25]

# 创建一个新列表，其中包含原始列表中每个元素的平方
original_list = [1, 2, 3, 4, 5]
squared_list = []

for x in original_list:
    squared_list.append(x**2)

print(squared_list)  # 输出: [1, 4, 9, 16, 25]

# 使用生成器表达式来计算平方
original_list = [1, 2, 3, 4, 5]
squared_generator = (x**2 for x in original_list)

for squared in squared_generator:
    print(squared)  # 输出: 1 4 9 16 25

# 优化后的常规 for 循环
original_list = [1, 2, 3, 4, 5]
squared_list = []

for i in range(len(original_list)):
    squared_list.append(original_list[i]**2)

print(squared_list)  # 输出: [1, 4, 9, 16, 25]