how to convert dict value use lambda map in python - python-3.x

Question

the format data like this, To explain, I have this dict:
{
'41': [
'1029136700',
'1028348931'
],
'42': ['12234454']
...
}
then i want to convert the format like this used lambda and map:
[
{
'key':'41','value':'1029136700'
},
{
'key':'41','value': '1028348931'
},
{
'key':'42', 'value': '12234454'
}
...
]
Can you give me a clue on how to achieve this in python?

Answer 1

Here is a clue on how to get what you want - you have to iterate over the initial dictionary:
for key, list_of_vals in initial_dictionary.items():
for val in list_of_vals:
# now you have pairs
# for example, key = '41', val = '1029136700'
# use them as you need
Just couple more steps and you get exactly what you want.
However, if you want to do this with map() and lambda it would not be that easy. You have to replace every for loop (there 2 of them) with map() containing lambda. map() returns generator so you have to iterate over it to get actual result, for example, list(map(...)). Here is complete code how you can get what you want:
result = list()
set(map(lambda item: result.extend(list(
map(lambda val: {'key': item[0], 'value': val},
item[1]))),
initial_dictionary.items()))
print(result)
Output:
[{'key': '41', 'value': '1029136700'}, {'key': '41', 'value': '1028348931'}, {'key': '42', 'value': '12234454'}]
This implementation is significantly more difficult to read and understand.