Python3 推导式之列表推导式、生成器推导式、字典推导式

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# 列表推导式
my_list = [1,2,3,4,5,6,7,8,9]
new_list = [item for item in my_list if (item % 2) == 0]
print(new_list)


# 生成器推导式
my_generator = [1,2,3,4,5,6,7,8,9]
new_generator = (item for item in my_list if (item % 2) == 0)
print(type(new_generator))
print(new_generator)
# 生成器利用for循环来遍历
for item in new_generator:
  print(item)


# 字典推导式
my_dict = {'aea1':22,'aea2':33,'aea3':44}
# 利用字典推导式将键值互换
new_dict = {value:key for key,value in my_dict.items()}
print(new_dict)