【脚本语言系列】关于Python基础知识容器，你需要知道的事

如何使用容器

# -*- coding:utf-8 -*-
from collections import defaultdict

names = (
("Allen","Moore"),
("Alan","Moore"),
("Ellen","Moore"),
)

used_names = defaultdict(list)

for firstname, lastname in names:
used_names[firstname].append(lastname)

print used_names

defaultdict(<type 'list'>, {'Allen': ['Moore'], 'Ellen': ['Moore'], 'Alan': ['Moore']})

# -*- coding:utf-8 -*-
import collections, json
tree = lambda: collections.defaultdict(tree)
the_dict = tree()
the_dict["Name"]["Firstname"] = "Allen"

print json.dumps(the_dict)

{"Name": {"Firstname": "Allen"}}

# -*- coding:utf-8 -*-
from collections import Counter

names = (
("Allen","Moore"),
("Alan","Moore"),
("Ellen","Moore"),
)

the_names = Counter(firstname for firstname, name in names)
print the_names

Counter({'Allen': 1, 'Ellen': 1, 'Alan': 1})

with open("filename.txt", 'rb') as f:
line_count = Counter(f)
print line_count

---------------------------------------------------------------------------

IOError                                   Traceback (most recent call last)

<ipython-input-16-097d520b5525> in <module>()
----> 1 with open("filename.txt", 'rb') as f:
2     line_count = Counter(f)
3 print line_count

IOError: [Errno 2] No such file or directory: 'filename.txt'

# -*- coding:utf-8 -*-
from collections import deque

d = deque()
d.append('12')
d.append('23')
d.append('34')

print len(d)
print d[0], d[1], d[-1]

# -*- coding:utf-8 -*-
d = deque(range(10))
print len(d)
print d[0], d[1], d[-1], d

d.popleft()
print d[0], d[1], d[-1], d

d = deque(range(10))
print len(d)
print d[0], d[1], d[-1], d

d.pop()
print d[0], d[1], d[-1], d

# -*- coding:utf-8 -*-
d = deque(range(10))
d.extendleft([-3, -2, -1])
d.extend([10, 11, 12])
print len(d)
print d

16
deque([-1, -2, -3, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])

# -*- coding:utf-8 -*-
d = deque(maxlen=(10))
d.extendleft(range(-10,0))
print d
d.extend(range(5))
print d
d.extend(range(3))
print d
d.extendleft(range(-3, 0))
print d
d.extendleft(range(-5, 0))
print d

deque([-1, -2, -3, -4, -5, -6, -7, -8, -9, -10], maxlen=10)
deque([-6, -7, -8, -9, -10, 0, 1, 2, 3, 4], maxlen=10)
deque([-9, -10, 0, 1, 2, 3, 4, 0, 1, 2], maxlen=10)
deque([-1, -2, -3, -9, -10, 0, 1, 2, 3, 4], maxlen=10)
deque([-1, -2, -3, -4, -5, -1, -2, -3, -9, -10], maxlen=10)

# -*- coding:utf-8 -*-
from collections import namedtuple

Id = namedtuple('ID','Name, Age, Job')
the_id = Id(Name='AllenMoore',Age = 29, Job="Design")

print the_id
print the_id.Name
print the_id.Age
print the_id.Job

ID(Name='AllenMoore', Age=29, Job='Design')
AllenMoore
29
Design

# -*- coding:utf-8 -*-
from collections import namedtuple

Id = namedtuple('ID','Name, Age, Job')
the_id = Id(Name='AllenMoore',Age = 29, Job="Design")

print the_id
print the_id._asdict()

ID(Name='AllenMoore', Age=29, Job='Design')
OrderedDict([('Name', 'AllenMoore'), ('Age', 29), ('Job', 'Design')])

# -*- coding:utf-8 -*-
from collections import namedtuple
from enum import Enum

class Ids(Enum):
Arting = 0
Engineer = 1
Science = 2
Manage = 3
Religous = 4

Drawing = 0
Design = 0
Id = namedtuple('ID','Name, Age, Job')
the_Allen = Id(Name='Allen',Age = 29, Job=Ids.Arting)
the_Moore = Id(Name='Moore',Age = 29, Job=Ids.Science)
the_Ellen = Id(Name='Ellen',Age = 29, Job=Ids.Drawing)

print Ids(0)
print Ids['Drawing']
print Ids.Drawing

Ids.Arting
Ids.Arting
Ids.Arting

什么是容器