Python collections模块使用方法详解

import collections
# help(collections.namedtuple)
Point = collections.namedtuple("Point",['x','y'])
p = Point(15,45)
print(p.x+p.y)
print(p[0]+p[1])
#支持索引等
#应用举例
Circle = collections.namedtuple('Circle',['x','y','r'])
circle = Circle(14,15,45)
propotion = circle[2]*circle[2]*3.141596
print("圆的面积为",propotion)

q = collections.deque(['a','b','c'])
print(q)
q.append('sada')
q.appendleft('left')
print(q)
help(collections.deque)

d1 = {"one":1,"two":2,"three":3}
print("four")
#上面的会报错，下面的就会返回函数，告诉我们错了
func = lambda:"错了"
d2 = collections.defaultdict(func)
d2['one']=1
d2['two']=2
print(d2['four'])

list1 = collections.Counter("aaabbbccc")
print(list1)
list2 = collections.Counter(['abc','sad','sad','abc','abc','ffds'])
print(list2)