Generate a dictionary with keys and incrementing list values

Question

I need to generate a dictionary as a pattern in the following way as an example:

x = 3 #number of keys
y = 4 #the number of values in first key, incremented in each following key

The desired output is:

{1:[0,1,2,3],2:[0,1,2,3,4],3:[0,1,2,3,4,5]}

How can I generate this output?

user_7866231 · Answer

Is this ok to you?

x = 3
y = 4
my_list = {}
for i in range(1, x + 1):
    my_list[i] = list(range(y))
    y += 1

Or one line python using dict comprehension(maybe harder to understand):

x = 3
y = 4
my_list = {i + 1: list(range(y + i)) for i in range(x)}

user_17769815 · Answer

You can use a dictionary comprehension:

{i: list(range(j)) for i, j in zip(range(1, x + 1), range(y, y + x))}

This outputs:

{1: [0, 1, 2, 3], 2: [0, 1, 2, 3, 4], 3: [0, 1, 2, 3, 4, 5]}