python - Work with list and dictionary -


i have list:

list = [     {'album': '1', 'artist': 'pedro', 'title': 'duhast'},     {'album': '2', 'artist': 'hose', 'title':'star boy'},     {'album': '1', 'artist': 'migel', 'title': 'lemon tree'} ]

i need group/sort list :

list = [     {'album': '1',       'tracks': [         {'artist': 'pedro', 'title': 'duhast'},         {'artist': 'migel', 'title': 'lemon tree'}]     },     {'album': '2',      'tracks':[         {'artist': 'hose', 'title':'star boy'}]     } ]

more precisely, need group tracks albums. ideas make easy?

1-liner :)

from itertools import groupby  list = [{'album': '1', 'artist': 'pedro', 'title': 'duhast'}, {'album': '2', 'artist': 'hose', 'title':'star boy'}, {'album': '1', 'artist': 'migel', 'title': 'lemon tree'}]  res = [{'album': album, 'tracks': [{'artist': track['artist'], 'title': track['title']} track in tracks]} album, tracks in groupby(sorted(list, key=lambda x: x['album']), lambda x: x['album'])]  print(res)

https://repl.it/ha48/2

as @prune mentioned, groupby function can used group list specified key function. in order work, list must sorted key.

personally, find above solution little hard read... gives same result:

from itertools import groupby  list = [{'album': '1', 'artist': 'pedro', 'title': 'duhast'}, {'album': '2', 'artist': 'hose', 'title':'star boy'}, {'album': '1', 'artist': 'migel', 'title': 'lemon tree'}]  res = [] album, tracks in groupby(sorted(list, key=lambda x: x['album']), lambda x: x['album']):   res.append({'album': album, 'tracks': [{'artist': track['artist'], 'title': track['title']} track in tracks]})  print(res)

https://repl.it/ha48/1


Comments

Post a Comment

Popular posts from this blog

How to understand 2 main() functions after using uftrace to profile the C++ program? -

i trying uftrace profile following simple c++ program: #include <iostream> class { public: a() {std::cout << "a created" << std::endl;} ~a() {std::cout << "a destroyed" << std::endl;} }; int main() { a; return 0; } the profile result this: # uftrace a.out created destroyed # duration tid function 2.026 [ 4828] | __cxa_atexit(); [ 4828] | main() { [ 4828] | __static_initialization_and_destruction_0() { 89.397 [ 4828] | std::ios_base::init::init(); 0.768 [ 4828] | __cxa_atexit(); 93.029 [ 4828] | } /* __static_initialization_and_destruction_0 */ 94.425 [ 4828] | } /* main */ [ 4828] | main() { [ 4828] | a::a() { 11.104 [ 4828] | std::operator <<(); 10.825 [ 4828] | std::basic_ostream::operator <<(); 24.514 [ 4828] | } /* a::a */ [ 4828] | a::~a() { 0.978 [ 4828] | ...
Read more

c# - Update a combobox from a presenter (MVP) -

i using mvp in project, new in mvp. have 2 comboboxes. when select option in combobox, combobox should filled new data. this action in presenter. view 'view1' in presenter, , introduced combobox1 , combobox2 properties in 'view1', because need 'datasource', 'displaymember', 'valuemember' , 'refresh()' in method below. but, when using pattern, enough send property like public string combobox2 { { return combobox1.selectedvalue.tosstring(); } } into presenter not whole combobox. how can solve problem? public void onselectedindexchangedcombobox1() { if (view1.combobox1.selectedindex == -1) { return; } datatable dt = tools.getdatatable("a path"); var query = (from o in dt.asenumerable() o.field<string>("afield") == farmerview.combobox1.selectedvalue.tostring() orderby o.field<string>("anotherfield") select...
Read more

How to put a lock and transaction on table using spring 4 or above using jdbcTemplate and annotations like @Transactional? -

i trying put lock on table while writing on table , if happened in between roll-back . trying convert below code lock table test_g1 read; lock table test_g write; -- begin; start transaction; insert test_g1 values(143); insert test_g values(145); select * test_g1; select * test_g; rollback; select * test_g; unlock tables; how convert above code @transactional spring jdbctemplate code? @transactional(rollbackfor={dataaccessexception.class}) public void test(){ jdbctemplate.execute("insert test1 (id, nam) values (4, 'a')"); throw new dataaccessexception("error") { }; } here trying throw error, insert statement should rollback it's not happening . thanks edit-1 attaching code , doing in jdbcdaoimpl.java , mentioned problem comment above test() . app.java package com.cgiri.javabrains.spring4; import org.springframework.beans.factory.annotation.autowired; import org.springframework.context.applic...
Read more