python 内置函数

#filterdef fun1(s):    if s != 'a':        return  sstr = ['a','b','c','d']f1 = filter(fun1 , str)print(list(f1))['b', 'c', 'd']#mapstr = ['1','2','3']def fun2(s):    return s+'martin'var = map(fun2,str)print(list(var))['1martin', '2martin', '3martin']#reducedef add(x,y):    return  x+yret = reduce(add, range(1,101))print(ret)5050#lambdaprint(reduce(lambda x,y:x*y,range(1,6)))120