列表推導(dǎo)式 [結(jié)果 for循環(huán) if]
字典推導(dǎo)式 {結(jié)果(k:v) for循環(huán) if}
集合推導(dǎo)式 {結(jié)果(k) for循環(huán) if}

# 生成列表: python1->python18 # lst = [] # for i in range(1, 19): # lst.append("python%s期" % i) # # print(lst) # 列表推導(dǎo)式 [結(jié)果 for循環(huán) if條件]# lst = ["python%s期" % i for i in range(1, 19)] # print(lst)# 生成列表.類表中裝的數(shù)據(jù)是 1-100之間所有的偶數(shù)的平方# lst = [i**2 for i in range(1, 101) if i%2 == 0] # print(lst)# 篩選出列表中姓張的同學(xué), lst = ["張無忌", "吳奇隆", "張詩詩", "范冰冰", "張翠山"] # lst = ["張無忌", "吳奇隆", "張詩詩", "范冰冰", "張翠山"] # lst2 = [name for name in lst if name.startswith("張")] # print(lst2)# # 尋找名字中帶有兩個e的人的名字 # names = [['Tom', 'Billy', 'Jefferson', 'Andrew', 'Wesley', 'Steven','Joe'], # ['Alice', 'Jill', 'Ana', 'Wendy', 'Jennifer', 'Sherry', 'Eva']] # # lst = [name for el in names for name in el if name.count("e") == 2] # print(lst)# 字典推導(dǎo)式 # 語法: { 結(jié)果(key:value) for循環(huán) if條件} # lst = [11,22,33] # {0:11, 1:22, 2:33} # # dic = {i:lst[i] for i in range(len(lst))} # print(dic)# 練習(xí): {"主食": "炒面", "副食": "小拌菜", "湯":"疙瘩湯"} # 把字典的key和value互換, 生成新字典 # dic = {"主食": "炒面", "副食": "小拌菜", "湯":"疙瘩湯"} # d = { v:k for k, v in dic.items()} # print(d)# 集合推導(dǎo)式 {k for循環(huán) if 條件}# 沒有元組推導(dǎo)式# g = (i for i in range(10)) # 生成器表達(dá)式 # # print(g) # <generator object <genexpr> at 0x0000000009E573B8> # # print(g.__next__()) # 0 # print(g.__next__()) # 1 # print(g.__next__()) # 2 # print(g.__next__()) # 3 # print(g.__next__()) # 4 # print(g.__next__()) # 5 # print(g.__next__()) # 6 # print(g.__next__()) # 7 # print(g.__next__()) # 8 # print(g.__next__()) # 9 # # print(g.__next__()) # ??? StopIteration # # # g = (i for i in range(10)) # 生成器表達(dá)式# 生成器函數(shù) # def func(): # print(111) # yield 222 # # # 惰性機(jī)制, 只能向前 # g = func() # 創(chuàng)建生成器 # g1 = (i for i in g) # 生成器表達(dá)式 # g2 = (i for i in g1) # 生成器表達(dá)式 # # # # print(list(g1)) # print(list(g)) # for -> __next__() # print(list(g2))

　　

轉(zhuǎn)載于:https://www.cnblogs.com/YangWenYu-6/p/10105571.html

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