3.14 collectionsモジュール

1.namedtuple：世代は、要素のタプルのコンテンツにアクセスするための名前を使用することができます

from collections import namedtuple
point = namedtuple('Point',['x','y'])
print(type(point))
p = point(1,2)
print(p)#Point(x=1, y=2)
print(p[0])#1
print(p.x)#1
struct_time = namedtuple('struct_time',['tm_year', 'tm_mon', 'tm_mday'])
st = struct_time(2019,7,3)
print(st)#struct_time(tm_year=2019, tm_mon=7, tm_mday=3)

2.deque：リスト、要素の削除、挿入素子の高効率と同様コンテナ型データ。

from collections import deque
q = deque(['a',1,'c','d'])
print(q)#deque(['a', 1, 'c', 'd'])
q.append('e')
q.appendleft('ly')#从左边添加
q.appendleft('dfs')
print(q)#deque(['dfs', 'ly', 'a', 1, 'c', 'd', 'e'])
q.pop()#删除最后一个
q.popleft()#删除最左边的元素
print(q)

按照索引取值
print(q[0])
按照索引删除任意值
del q[2]
print(q)
q.insert(1,'2')
print(q)

3.OrderedDict：注文した辞書

d = dict([('a', 1), ('b', 2), ('c', 3)])
print(d)
from collections import OrderedDict
od = OrderedDict([('a', 1), ('b', 2), ('c', 3)])
print(od['a'])
print(od['b'])
返回结果:
{'a': 1, 'b': 2, 'c': 3}
1
2

4.defaultdict：デフォルト値で辞書

默认值字典
l1 = [11, 22, 33, 44, 55, 77, 88, 99]
dic = {}
for i in l1:
    if i<66:
        if 'key1'not in dic:
            dic['key1'] = []
        dic['key1'].append(i)
    else:
        if 'key2'not in dic:
            dic['key2'] = []
        dic['key2'].append(i)
print(dic){'key1': [11, 22, 33, 44, 55], 'key2': [77, 88, 99]}
from collections import defaultdict
l1 = [11, 22, 33, 44, 55, 77, 88, 99]
dic = defaultdict(list)
for i in l1:
    if i < 66:
        dic['key1'].append(i)
    else:
        dic['key2'].append(i)
print(dict(dic))
{'key1': [11, 22, 33, 44, 55], 'key2': [77, 88, 99]}
dic = defaultdict(lambda :None)
# dic = defaultdict(None)
for i in range(1,4):
    dic[i]
print(dic)

5..Counter：メインをカウントするカウンタ

c = Counter('flkjdasffdfakjsfdsaklfdsalf')  # 计数器
print(c)
print(c['f'])
返回结果:
Counter({'f': 7, 'd': 4, 'a': 4, 's': 4, 'l': 3, 'k': 3, 'j': 2})
7

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