Is there any way to map a list of elements to a dictionary without a loop?
1
I want to create 2 dictionaries by mapping 2 lists from a central dictionary, without using a loop.
Input dictionary:
edict_all = { 1:[[23,20]], 2:[[45,45]], 3:[[56,43]], 4:[[66,23]], 5:[[24,23]], 9:[[57,78]], 8:[[67,76]], 51:[[242,223]]}
And I have 2 lists:
list_a = [1,4,8,9,51]
list_b = [1,2,3,5,9]
Currently, I am using 2 for loops:
edict_a, edict_b = dict(), dict()
for i in list_a:
edict_a[i] = edict_all[i]
for i in list_b:
edict_b[i] = edict_all[i]
And the output is:
edict_a = {1: [[23, 20]], 4: [[66, 23]], 8: [[67, 76]], 9: [[57, 78]], 51: [[242, 223]]}
edict_b = {1: [[23, 20]], 2: [[45, 45]], 3: [[56, 43]], 5: [[24, 23]], 9: [[57, 78]]}
python python-3.x list dictionary mapping
edited Nov 14 '18 at 17:14
jpp
100k2162111
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
add a comment |
1
I want to create 2 dictionaries by mapping 2 lists from a central dictionary, without using a loop.
Input dictionary:
edict_all = { 1:[[23,20]], 2:[[45,45]], 3:[[56,43]], 4:[[66,23]], 5:[[24,23]], 9:[[57,78]], 8:[[67,76]], 51:[[242,223]]}
And I have 2 lists:
list_a = [1,4,8,9,51]
list_b = [1,2,3,5,9]
Currently, I am using 2 for loops:
edict_a, edict_b = dict(), dict()
for i in list_a:
edict_a[i] = edict_all[i]
for i in list_b:
edict_b[i] = edict_all[i]
And the output is:
edict_a = {1: [[23, 20]], 4: [[66, 23]], 8: [[67, 76]], 9: [[57, 78]], 51: [[242, 223]]}
edict_b = {1: [[23, 20]], 2: [[45, 45]], 3: [[56, 43]], 5: [[24, 23]], 9: [[57, 78]]}
python python-3.x list dictionary mapping
edited Nov 14 '18 at 17:14
jpp
100k2162111
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
Not aware of a way to get what you are looking for without python looping through the values. There are lots of ways to get what you want with list or dict comprehensions as well as built-in functions that may not have the appearance of the looping approach you are using (and may be more efficient) but in fact are all looping through the data.
– benvc
Nov 14 '18 at 16:24
add a comment |
1
1
1
I want to create 2 dictionaries by mapping 2 lists from a central dictionary, without using a loop.
Input dictionary:
edict_all = { 1:[[23,20]], 2:[[45,45]], 3:[[56,43]], 4:[[66,23]], 5:[[24,23]], 9:[[57,78]], 8:[[67,76]], 51:[[242,223]]}
And I have 2 lists:
list_a = [1,4,8,9,51]
list_b = [1,2,3,5,9]
Currently, I am using 2 for loops:
edict_a, edict_b = dict(), dict()
for i in list_a:
edict_a[i] = edict_all[i]
for i in list_b:
edict_b[i] = edict_all[i]
And the output is:
edict_a = {1: [[23, 20]], 4: [[66, 23]], 8: [[67, 76]], 9: [[57, 78]], 51: [[242, 223]]}
edict_b = {1: [[23, 20]], 2: [[45, 45]], 3: [[56, 43]], 5: [[24, 23]], 9: [[57, 78]]}
python python-3.x list dictionary mapping
edited Nov 14 '18 at 17:14
jpp
100k2162111
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
I want to create 2 dictionaries by mapping 2 lists from a central dictionary, without using a loop.
Input dictionary:
edict_all = { 1:[[23,20]], 2:[[45,45]], 3:[[56,43]], 4:[[66,23]], 5:[[24,23]], 9:[[57,78]], 8:[[67,76]], 51:[[242,223]]}
And I have 2 lists:
list_a = [1,4,8,9,51]
list_b = [1,2,3,5,9]
Currently, I am using 2 for loops:
edict_a, edict_b = dict(), dict()
for i in list_a:
edict_a[i] = edict_all[i]
for i in list_b:
edict_b[i] = edict_all[i]
And the output is:
edict_a = {1: [[23, 20]], 4: [[66, 23]], 8: [[67, 76]], 9: [[57, 78]], 51: [[242, 223]]}
edict_b = {1: [[23, 20]], 2: [[45, 45]], 3: [[56, 43]], 5: [[24, 23]], 9: [[57, 78]]}
python python-3.x list dictionary mapping
python python-3.x list dictionary mapping
edited Nov 14 '18 at 17:14
jpp
100k2162111
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
edited Nov 14 '18 at 17:14
jpp
100k2162111
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
edited Nov 14 '18 at 17:14
jpp
100k2162111
edited Nov 14 '18 at 17:14
jpp
100k2162111
edited Nov 14 '18 at 17:14
jpp
100k2162111
100k2162111
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
asked Nov 14 '18 at 15:15
Gurpreet.SGurpreet.S
546
546
Not aware of a way to get what you are looking for without python looping through the values. There are lots of ways to get what you want with list or dict comprehensions as well as built-in functions that may not have the appearance of the looping approach you are using (and may be more efficient) but in fact are all looping through the data.
– benvc
Nov 14 '18 at 16:24
add a comment |
Not aware of a way to get what you are looking for without python looping through the values. There are lots of ways to get what you want with list or dict comprehensions as well as built-in functions that may not have the appearance of the looping approach you are using (and may be more efficient) but in fact are all looping through the data.
– benvc
Nov 14 '18 at 16:24
Not aware of a way to get what you are looking for without python looping through the values. There are lots of ways to get what you want with list or dict comprehensions as well as built-in functions that may not have the appearance of the looping approach you are using (and may be more efficient) but in fact are all looping through the data.
– benvc
Nov 14 '18 at 16:24
Not aware of a way to get what you are looking for without python looping through the values. There are lots of ways to get what you want with list or dict comprehensions as well as built-in functions that may not have the appearance of the looping approach you are using (and may be more efficient) but in fact are all looping through the data.
– benvc
Nov 14 '18 at 16:24
add a comment |
2 Answers
2
active
oldest
votes
1
Loops at some level are unavoidable here, but you can hide them with zip and operator.itemgetter:
from operator import itemgetter
edict_a = dict(zip(list_a, itemgetter(*list_a)(edict_all)))
edict_b = dict(zip(list_b, itemgetter(*list_b)(edict_all)))
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
add a comment |
0
You can use Python generator expression to filter data and then pass it back to dict() constructor:
edict_a = dict((key, value) for key, value in edict_all.items() if key in list_a)
edict_b = dict((key, value) for key, value in edict_all.items() if key in list_b)
And yes, loops in any form are unavoidable for this problem. At least you can write it in one line.
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
Loops at some level are unavoidable here, but you can hide them with zip and operator.itemgetter:
from operator import itemgetter
edict_a = dict(zip(list_a, itemgetter(*list_a)(edict_all)))
edict_b = dict(zip(list_b, itemgetter(*list_b)(edict_all)))
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
add a comment |
1
Loops at some level are unavoidable here, but you can hide them with zip and operator.itemgetter:
from operator import itemgetter
edict_a = dict(zip(list_a, itemgetter(*list_a)(edict_all)))
edict_b = dict(zip(list_b, itemgetter(*list_b)(edict_all)))
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
add a comment |
1
1
1
Loops at some level are unavoidable here, but you can hide them with zip and operator.itemgetter:
from operator import itemgetter
edict_a = dict(zip(list_a, itemgetter(*list_a)(edict_all)))
edict_b = dict(zip(list_b, itemgetter(*list_b)(edict_all)))
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
Loops at some level are unavoidable here, but you can hide them with zip and operator.itemgetter:
from operator import itemgetter
edict_a = dict(zip(list_a, itemgetter(*list_a)(edict_all)))
edict_b = dict(zip(list_b, itemgetter(*list_b)(edict_all)))
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
answered Nov 14 '18 at 17:13
jppjpp
100k2162111
100k2162111
add a comment |
add a comment |
0
You can use Python generator expression to filter data and then pass it back to dict() constructor:
edict_a = dict((key, value) for key, value in edict_all.items() if key in list_a)
edict_b = dict((key, value) for key, value in edict_all.items() if key in list_b)
And yes, loops in any form are unavoidable for this problem. At least you can write it in one line.
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
add a comment |
0
You can use Python generator expression to filter data and then pass it back to dict() constructor:
edict_a = dict((key, value) for key, value in edict_all.items() if key in list_a)
edict_b = dict((key, value) for key, value in edict_all.items() if key in list_b)
And yes, loops in any form are unavoidable for this problem. At least you can write it in one line.
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
add a comment |
0
0
0
You can use Python generator expression to filter data and then pass it back to dict() constructor:
edict_a = dict((key, value) for key, value in edict_all.items() if key in list_a)
edict_b = dict((key, value) for key, value in edict_all.items() if key in list_b)
And yes, loops in any form are unavoidable for this problem. At least you can write it in one line.
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
You can use Python generator expression to filter data and then pass it back to dict() constructor:
edict_a = dict((key, value) for key, value in edict_all.items() if key in list_a)
edict_b = dict((key, value) for key, value in edict_all.items() if key in list_b)
And yes, loops in any form are unavoidable for this problem. At least you can write it in one line.
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
answered Nov 14 '18 at 18:10
Andrey SemakinAndrey Semakin
12017
12017
add a comment |
add a comment |
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Not aware of a way to get what you are looking for without python looping through the values. There are lots of ways to get what you want with list or dict comprehensions as well as built-in functions that may not have the appearance of the looping approach you are using (and may be more efficient) but in fact are all looping through the data.
– benvc
Nov 14 '18 at 16:24