内置函数

str = ["a","b","c","d"]
def ff(s):
    if s != "c":
        return s
dd = filter(ff,str)     #dd迭代器   filter只过滤不改变
print(list(dd))
print(dd)


print("---------------------------------------------------------- ")
str2=["g","h","k","l"]
def ff2(gg):
    return gg+"gg"
ffd = filter(ff2,str2)     #filter只过滤不改变
print(list(ffd))        #['g', 'h', 'k', 'l']
print("---------------------------------------------------------- ")
mapstr =["a","b","c"]
def mapfun(mapf):
    return mapf+"m"
ccmap = map(mapfun,mapstr)
print(ccmap)
print(list(ccmap))

print("---------------------------------------------------------- ")


from functools import reduce
red = [1,2,3,4,5]
def redu(x,y):   #必须是两个参数
    return x * y
rr = reduce(redu,red)   #range（1，101）
print(rr)
print("---------------------------------------------------------- ")

#匿名函数
la = reduce(lambda fa,fb : fa * fb,range(1,6))

print(la)