python dic

Question

how can i separate a key in dic that is string

for example i have dic like below:

a = {"10":1 , "21":14}
i want to separate 1 and 0
and separate 2 and 1

Answer 1

As a normal for-loop it would look like this:

b = []
for key in a:
sublist = []
for digit in key:
sublist.append(int(digit))
sublist.append(a[key])
b.append(sublist)

With comprehensions, you get rid of the in-between lists, the appending happens implicitly, and the order is different.

Comprehensions in all their shapes are quite convenient. Maybe you want to read this:

https://code.sololearn.com/ck6HicJ6Z8jG/?ref=app

Answer 2

@HouFu look i want to separate key and save in a matrix
b is a array in this case
like that
b = [[1 , 0 , 1] , [2, 1 ,14]]

b[0][3] = 1 is value of key '10'
b[1][3] = 14 is value of key '21'

Answer 3

@HonFu Thanks a lotttt

Answer 4

What will the new keys contain? Can you show how the dict will look after that?

Answer 5

@HonFu i dont want to change the keys i just want to use the keys but i want to separate them to use

Answer 6

nima x, but if you separate them, you will have two keys, where there was one before.

What value will the additional key get?

Answer 7

If you just need the digits as str:

b = [list(key)+[a[key]] for key in a]

If the digits have to be actual integers:

b = [[int(digit) for digit in key] + [a[key]] for key in a]

Answer 8

AmgKhvbbi Schweppes, this is not your question thread. Please follow the forum rules and only post ontopic.

https://www.sololearn.com/discuss/1316935/?ref=app

Answer 9

@Kiibo Ghayal @Honfu thanks Honfu it works but can you explain this list comprehension i have problem in understanding it
b = [[int(digit) for digit in key] + [a[key]] for key in a]