如何将列表理解转换为普通的 for 循环？

Question

I'm trying to learn how I can convert Python list comprehensions to a normal for-loop. I have been trying to understand it from the pages on the net, however when I'm trying myself, I can't seem to get it to work.

What I am trying to convert is the following:
1:

n, m = [int(i) for i in inp_lst[0].split()]

and this one (which is a little bit harder):
2:

lst = [[int(x) for x in lst] for lst in nested[1:]]

However, I am having no luck with it.

What I have tried:
1:

n = []
for i in inp_lst[0].split():
    n.append(int(i))
print(n)

If I can get some help, I will really appreciate it:D

Answer 1

Generally speaking, a list comprehension like:

a = [b(c) for c in d]

Can be written using a for loop as:

a = []
for c in d:
    a.append(b(c))

Something like:

a, b = [c(d) for d in e]

Might be generalized to:

temp = []
for d in e:
    temp.append(c(d))

a, b = temp

Something like:

lst = [[int(x) for x in lst] for lst in nested[1:]]

Is no different.

lst = []
for inner_lst in nested[1:]:
    lst.append([int(x) for x in inner_lst])

If we expand that inner list comprehension:

lst = []
for inner_lst in nested[1:]:
    temp = []
    for x in inner_lst:
        temp.append(int(x))
    lst.append(temp)