How to iterate over loist to make its values as my nested dict in python-CodePudding

I am not moving forward and need som help (I'm new to coding)

I have the following structure:

sim = {'S1': {}, 'S2': {}, 'S3': {}, 'S4': {}, 'S5': {}}

and a list sim_list = [1,2,3,4,5]

my result should look like this:

sim = {'S1': {"number": 1}, 'S2': {"number": 2}, 'S3': {"number": 3}, 'S4': {"number": 4}, 'S5': {"number": 5}}

my attempt:

for key in sim.keys():
    for i in sim_list:
        sim[key]= {"number":i}

but i only get inner dicts with {"number":5}:

sim = {'S1': {"number": 5}, 'S2': {"number": 5}, 'S3': {"number": 5}, 'S4': {"number": 5}, 'S5': {"number": 5}}

so how can i iterate over the list objects to go to their respective place?

CodePudding user response：

Using dict comprehension:

sim = {'S1': {}, 'S2': {}, 'S3': {}, 'S4': {}, 'S5': {}}
sim_list = [1, 2, 3, 4, 5]

output = {list(sim)[i]: {"number": sim_list[i]} for i in range(len(sim))}
print(output)

The equivalent without dict comprehension would be:

output = {}
for i in range(len(sim)):
    output[list(sim)[i]] = {"number": sim_list[i] }
print(output)

It is also possible to use zip(), to associate each key and item together:

for key, num in zip(sim.keys(), sim_list):
    sim[key] = {"number": num}
print(sim)

CodePudding user response：

Or you could build the dictionary from scratch using a dictionary comprehension thus:

sim = {f'S{i}': {'number': i} for i in range(1, 6)}

print(sim)

Output:

{'S1': {'number': 1}, 'S2': {'number': 2}, 'S3': {'number': 3}, 'S4': {'number': 4}, 'S5': {'number': 5}}