Merging and mixing two list of list of dictionary in python-CodePudding

I have a list of list of dictionaries :

liste = [[{"template_id": 32, "template_name" : "test1"}, {"template_id": 34, "template_name" : "test2"}],[{"template_id": 34, "template_name" : "test3"}, {"template_id": 35, "template_name" : "test4"},{"template_id": 36, "template_name" : "test5"}]]

I want to merge them like this :

[{"template_id": 32, "template_name" : "test1"},{"template_id": 34, "template_name" : "test3"}, {"template_id": 34, "template_name" : "test2"},{"template_id": 35, "template_name" : "test4"},{"template_id": 36, "template_name" : "test5"}]

I have tried to do it like this but it does not work properly since i'm not a Python expert :

    for j in range(len(liste)):
        for i in range(len(liste[j]) 1):
            try :
                print(f"F={f},j={j}, i={i} ")
                optimized_list.append(liste[i][j])
                #print(liste[i][j]['template_name'])
            except IndexError:
                pass

CodePudding user response：

You can use itertools.chain:

from itertools import chain

liste = [[{"template_id": 32, "template_name" : "test1"}, {"template_id": 34, "template_name" : "test2"}],[{"template_id": 34, "template_name" : "test3"}, {"template_id": 35, "template_name" : "test4"},{"template_id": 36, "template_name" : "test5"}]]

output = [*chain.from_iterable(liste)]
print(output)
# [{'template_id': 32, 'template_name': 'test1'},
#  {'template_id': 34, 'template_name': 'test2'},
#  {'template_id': 34, 'template_name': 'test3'},
#  {'template_id': 35, 'template_name': 'test4'},
#  {'template_id': 36, 'template_name': 'test5'}]

CodePudding user response：

You can use numpy, and use concatenate() function and flat attribute to get your desired result.

import numpy 

liste = [[{"template_id": 32, "template_name" : "test1"}, 
        {"template_id": 34, "template_name" : "test2"}],[{"template_id": 
        34, "template_name" : "test3"}, {"template_id": 35, 
        "template_name" : "test4"},{"template_id": 36, "template_name" : 
        "test5"}]]

flat_list = list(numpy.concatenate(liste).flat)

print(flat_list)