Given a list:
a = [-20,-15,-10,-5,0]
and another:
b = [-3,-10,-14,-19,-13,-5,-0.5]
I now want a result dictionary that looks like the following:
N = {'-20 to -15': [-19], '-15 to -10': [-14,-13,-10], '-10 to -5': [-3,-5], '-5 to 0': [-0.5]}
The problem now is that I already can't get the "range" check correct. Can someone help me with the error in the code? I tried to get the index via a while loop:
j=0
while j < len(a):
index1 = next(x[0] for x in enumerate(b) if x[1] >= a[j])
index2 = next(x[0] for x in enumerate(b) if x[1] < a[j+1])
j=+1
There seems to be a problem somehow with comparing the negative values, at least I think. I would be very grateful for help!
A list comprehension inside a dictionary comprehension should do it:
>>> {f"{i} to {j}": [x for x in b if i < x <= j] for i, j in list(zip(a, a[1:]))}
{'-20 to -15': [-19], '-15 to -10': [-10, -14, -13], '-10 to -5': [-10, -5], '-5 to 0': [-3, -5, -0.5]}
Explanation:
list(zip(a, a[1:]))
: generates the ranges as a list of tuples[x for x in b if i <= x <= j]
: generates a list of values inside a given rangef"{i} to {j}"
: Formats the dictionary key