# Inserting element into list with python
**URL:** https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626
**Category:** Developers
**Created:** [August 1, 2017, 1:35pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626 "2017-08-01T13:35:36Z")
**Posts on this page:** 11
**Page:** 2
### Author:  [@Jorge\_Villarroel](https://forum.dynamobim.com/u/Jorge_Villarroel)
#### Post date: [August 1, 2017, 4:50pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/21 "2017-08-01T16:50:29Z")
Searching into the previous lines of the code, I did this:
```
resp = []
for i in range(len(inicio)):
resp.append(List.Flatten(inicio[i],1))
inicio = resp
```
so Inicio came formatted from this point as a list with nested lists which were **flattened**.
Could this be the seed of the problem?
---
### Author:  [@Jorge\_Villarroel](https://forum.dynamobim.com/u/Jorge_Villarroel)
#### Post date: [August 1, 2017, 4:54pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/22 "2017-08-01T16:54:31Z")
Here is he **inicio** sequence for best understanding:
```
inicio = []
fin = []
for capa in segmentos:
aux = []
aux2 = []
resp = []
resp2 = []
for tramo in capa:
aux.append(List.FirstItem(tramo))
aux2.append(List.LastItem(tramo))
resp.append(aux)
resp2.append(aux2)
aux = []
aux2 = []
inicio.append(resp)
fin.append(resp2)
resp = []
for i in range(len(inicio)):
resp.append(List.Flatten(inicio[i],1))
inicio = resp
resp = []
for i in range(len(fin)):
resp.append(List.Flatten(fin[i],1))
fin = resp
for k in range(len(ind_pisos)):
for i in range(len(inicio)):
for j in range(len(inicio[i])):
if ind_pisos[k] > inicio[i][j] and ind_pisos[k] < fin[i][j]:
aux = list(inicio[i])
aux.insert(j + 1, ind_pisos[k])
aux2 = list(fin[i])
aux2.insert(j, ind_pisos[k])
inicio[i] = aux
fin[i] = aux2
else:
pass
```
---
### Author:  [@T\_Pover](https://forum.dynamobim.com/u/T_Pover)
#### Post date: [August 1, 2017, 6:58pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/23 "2017-08-01T18:58:08Z")
That could very well be. Could you show me all the import statements at the top of your code?
---
### Author:  [@Jorge\_Villarroel](https://forum.dynamobim.com/u/Jorge_Villarroel)
#### Post date: [August 1, 2017, 7:45pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/24 "2017-08-01T19:45:47Z")
```
import clr
clr.AddReference('ProtoGeometry')
import Autodesk.DesignScript.Geometry
from Autodesk.DesignScript.Geometry import *
clr.AddReference('DSCoreNodes')
from DSCore import *
```
---
### Author:  [@T\_Pover](https://forum.dynamobim.com/u/T_Pover)
#### Post date: [August 1, 2017, 8:01pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/25 "2017-08-01T20:01:54Z")
I see, so it must be the DSCore method that caused it. Oh well, glad to hear you found a workaround š
---
### Author:  [@Jorge\_Villarroel](https://forum.dynamobim.com/u/Jorge_Villarroel)
#### Post date: [August 1, 2017, 8:15pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/26 "2017-08-01T20:15:40Z")
Yeah!. Now Iām figuring out how to flatten a nested list to get the exact data structure, avoiding List.Flatten. Any ideas?
---
### Author:  [@T\_Pover](https://forum.dynamobim.com/u/T_Pover)
#### Post date: [August 1, 2017, 8:18pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/27 "2017-08-01T20:18:35Z")
You mean to flatten in python without the DSCore method?
---
### Author:  [@Jorge\_Villarroel](https://forum.dynamobim.com/u/Jorge_Villarroel)
#### Post date: [August 1, 2017, 8:18pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/28 "2017-08-01T20:18:46Z")
yes
---
### Author:  [@Jorge\_Villarroel](https://forum.dynamobim.com/u/Jorge_Villarroel)
#### Post date: [August 1, 2017, 8:19pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/29 "2017-08-01T20:19:58Z")
```
resp = []
for i in range(len(inicio)):
resp.append(List.Flatten(inicio[i],1))
inicio = resp
resp = []
for i in range(len(fin)):
resp.append(List.Flatten(fin[i],1))
fin = resp
```
this part, avoiding List.Flatten()
---
### Author:  [@T\_Pover](https://forum.dynamobim.com/u/T_Pover)
#### Post date: [August 1, 2017, 8:30pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/30 "2017-08-01T20:30:55Z")
Flatten in python is actually not that easy as the depths of lists can vary a lot. So you would have to come up with some kind of recursive function to tackle every kind of depth level.
In your case this should work I think:
---
### Author:  [@Jorge\_Villarroel](https://forum.dynamobim.com/u/Jorge_Villarroel)
#### Post date: [August 1, 2017, 8:32pm UTC](https://forum.dynamobim.com/t/inserting-element-into-list-with-python/13626/31 "2017-08-01T20:32:40Z")
@T_Pover Thanks a lot for your time! This thread really taught me a lot today!.
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