apply() filter()
apply() 相当于给一个函数传递参数，以列表或元祖的形式的形式，必须和函数的参数数量对应
def sum(x =1,y=2):
return x + y
print apply(sum,(1,3))
4
def sum(x,y):
return x + y
print apply(sum,[1,3])
4
filter(func or None,squence) > list or tuple or string
def func(x):
if x >0:
return x
print filter(func,range(-9,10))
[1, 2, 3, 4, 5, 6, 7, 8, 9]
reduce(func,sequence[,initial]) >value
def sum(x,y):
return x+y
print reduce(sum,range(0,10))
45
map(func,sequence[,sequence,...]) >list 对sequence里的每个元素执行func的操作，返回列表
print map(None,(1,2))
[1, 2]
cmp(x,y) 比较函数
delattr(obj,name) 等价于 del obj.name
class people(object):
def __init__(self,name,age):
self.name = name
self.age = age
p = people('yz',27)
print p.name
print p.age
delattr(p,'name')
print p.name 这句话时会报错，AttributeError: 'people' object has no attribute 'name' 因为name属性被删除
print p.age
zip(seq1[seq2,...])
a = [1,2,3,4,5]
print zip(a)
print zip(a,a)
print zip(a,a,a)
[(1,), (2,), (3,), (4,), (5,)]
[(1, 1), (2, 2), (3, 3), (4, 4), (5, 5)]
[(1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4), (5, 5, 5)]