L21匿名函數lambda()

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lambda(參數:返回值)>>> def ds(x):return 2*x+1

>>> ds(5)11>>> lambda x : 2*x+5<function <lambda> at 0x02C66D68>>>> g = lambda x : 2*x+5>>> g(5)15#兩個參數>>> def add(x,y):return x + y>>> add(3,4)7>>> >>> lambda x,y : x + y<function <lambda> at 0x02EEA078>>>> g = lambda x,y : x + y>>> g(3 , 7)10 #filter(function, iterable)#過濾器:把任何非true的內容過濾掉>>> filter(None,[1, 0, False, True])<filter object at 0x02C8D910>

>>> list(filter(None,[1, 0, False, True]))[1, True]--------------------------------------------------------------->>> def odd(x):x = x%2return x>>> temp = range(10)>>> show = filter(odd,temp)>>> list(show)[1, 3, 5, 7, 9]>>> list(filter(lambda x:x%2, range(10)))[1, 3, 5, 7, 9]                           #因為偶數的話餘0>>>False-----------------------------------------------------------------#map()映射:將序列的函數作為每一個函數加工>>> list(map(lambda x:x*2, range(10)))[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

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