# 列表推導
# l = [‘雞蛋%s‘ %i for i in range(10)]
# print(l)

# l = []
# for i in range(10):
#     l.append(‘雞蛋%s‘ %i)
# print(l)

#生成器表達式，括號不一樣，且返回值不一樣
# g = (i for i in range(10))
# print(g)                          #生成器
# for i in g:
#     print(i)

# g1 = (i*i for i in range(10))
# print(list(g1))                  #強制轉換為list，占內存，不推薦
 



# 字典推導式
# 例一：將一個字典的key和value對調
# mcase = {‘a‘: 10, ‘b‘: 34}
# mcase_frequency = {mcase[k]:k for k in mcase}
# print(mcase_frequency)

#集合推導式
#將列表去重
# s = {x*x for x in [1,-1,2]}
# s1 =list(s)
# print(s1)

各種推導式