我是编程新手所以非常感谢所有帮助: 给出一个样本字典
d = {0 : (1, 2, 3), 1 : (2, 3, 4), 2 : (5, 6, 7)}
是否可以使用原始密钥创建新字典,但键的值是值的子值? 即:
0: (1, 2, 3) ---> 0: (4, 5, 6, 7), 1: (5, 6, 7, val(2), val(3))...
所以我希望删除2,3,因为它们已经包含在0的原始值中,依此类推。 *此外,我希望替换仅用于 n 次数
据我所知,这类似于制作一个子句?
问题在于,不是像上面那样使用给定的字典,而是使用每个键的给定值,我必须在大字典上执行此操作,所以我正在使用
-edit -
G = {
0:(1,2,3)
1:(3,4,5)
2:(4,5,6)
3:(7,8,9)
...
150:(10,11,12)}
- 编辑结束 -
k = d.keys()
v = d.values()
和
for v in k:
print v " is connected to ", d[v]," by 1 length"
这是一种稍微迂回的方式来显示键及其值
-edit -
所以我想创建一个新词典,其新值如下:
G_new = {
0 :((3,4,5),(4,5,6),(7,8,9))
1 :((7,8,9),(值4),(值5))
...}
然后只保留唯一值并删除键的旧值中包含的值,以便:
G_new_final = {
0:(4,5,6,7,8,9)
1:(7,8,9等)
...} #until key 150
既然我正在处理很多数字,我猜我需要某种函数或字典理解?
- 编辑结束 -
谢谢!
答案 0 :(得分:1)
>>> from collections import defaultdict
>>> a = defaultdict(set)
>>> d = {0: (1, 2, 3), 1: (2, 3, 4), 2: (5, 6, 7)}
#all subvalues of the values of x, no duplicate and without any value of key x
>>> [a[x].update(d.get(y, [])) for x in d for y in d[x]]
>>> [a[x].difference_update(d[x]) for x in d]
#convert it dict of tuple values
>>> {x:tuple(a[x]) for x in a}
{0: (4, 5, 6, 7), 1: (5, 6, 7), 2: ()}
>>>
答案 1 :(得分:1)
g = {0: (1,2,3),1: (3,4,5),2: (4,5,6),3: (7,8,9)}
g2 = dict()
for key in g.keys():
old_vals=set(g[key])
new_vals=[]
for val in old_vals:
try:
new_vals.extend(g[val])
except KeyError:
pass
new_vals = tuple(set(new_vals)-old_vals)
g2[key]=new_vals
给出
>>> g2
{0: (4, 5, 6, 7, 8, 9), 1: (8, 9, 7), 2: (), 3: ()}
但我不知道这与我answered previously?
的显着不同编辑:有趣的是,这种方法似乎比收藏品更快?
import time
import random
def makeg(n):
g=dict()
for i in xrange(n):
g[i] = tuple([random.randint(0,n) for _ in xrange(3)])
return g
g=makeg(100000)
def m(g):
g2 = dict()
for key in g.keys():
old_vals=set(g[key])
new_vals=[]
for val in old_vals:
try:
new_vals.extend(g[val])
except KeyError:
pass
new_vals = tuple(set(new_vals)-old_vals)
g2[key]=new_vals
return g2
s1 = time.time()
m(g)
e1 = time.time()
from collections import defaultdict
def h(g):
a = defaultdict(set)
[a[x].update(g.get(y, [])) for x in g for y in g[x]]
[a[x].difference_update(g[x]) for x in g]
g2={x:tuple(a[x]) for x in a}
return g2
s2 = time.time()
h(g)
e2=time.time()
mt =(e1-s1)
ht=(e2-s2)
print mt,ht,mt/ht
给出
nero@ubuntu:~/so$ python so.py
0.556298017502 0.850471019745 0.654105789129