Convert Pythonic approach of looping into nested loops

Question

I am a beginner in Python. I'd like to understand the Pythonic approach of looping as I am a C coder for a long time. Given the following two lines:

{k: v for out_d in outs for k, v in out_d.iteritems()}
[{} for i in range(nthreads)]

Can someone break it down so that it follows the C standard approach of nested loops?

Answer 1

my_dict = {k: v for out_d in outs for k, v in out_d.iteritems()}

# is equivalent to

my_dict = {}
for out_d in outs:
    for key, value in out_d.iteritems():
        my_dict[key] = value



my_list = [{} for i in range(nthreads)]

# is equivalent to

my_list = []
for i in range(nthreads):
    my_list.append({})