Python的map、filter、reduce函数

def map(func,seq): 
    mapped_seq = [] 
    for eachItem in seq: 
        mapped_seq.append(func(eachItem)) 
    return mapped_seq

def filter(bool_func,seq): 
    filtered_seq = [] 
    for eachItem in seq: 
        if bool_func(eachItem): 
            filtered_seq.append(eachItem) 
    return filtered_seq

def reduce(bin_func,seq,initial=None): 
    lseq = list(seq) 
    if initial is None: 
        res = lseq.pop(0) 
    else: 
        res = initial 
    for eachItem in lseq: 
        res = bin_func(res,eachItem) 
    return res

#coding:utf-8
def map_func(lis):
    return lis + 1
def filter_func(li):
    if li % 2 == 0:
        return True
    else:
        return False
        
def reduce_func(li, lis):
    return li + lis
    
li = [1,2,3,4,5]
map_l = map(map_func, li) #将li中所有的数都+1
filter_l = filter(filter_func, li) #得到li中能被2整除的
reduce_l = reduce(reduce_func, li) #1+2+3+4+5
print map_l
print filter_l
print reduce_l