列表生成式（列表推导式）
# 1. 提取出1-20之间的奇数
odd_list = []
for i in range(21):
if i%2 == 1:
odd_list.append(i)
print(odd_list)
odd_list = [i for i in range(21) if i%2 == 1]
print(odd_list)
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# 2.逻辑复杂的情况
def hadle_item(item):
return item * item
odd_list = [hadle_item(i) for i in range(21) if i%2 == 1]
print(odd_list)
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字典推导式
my_dict = {"bobby1":22, "bobby2":23, "imooc.com":5}
reversed_dict = {value:key for key,value in my_dict.items()}
print(reversed_dict)
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集合推导式
my_dict = {"bobby1":22, "bobby2":23, "imooc.com":5}
my_set = {key for key, value in my_dict.items()}
print(type(my_set))
print(my_set)
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