Divide a list into multiple lists based on a bin size

Question

I have a list containing more than 100,000 values in it.

I need to divide the list into multiple smaller lists based on a specific bin width say 0.1. Can anyone hel

Answer 1

This works:

l=[-0.234, -0.04325, -0.43134, -0.315, -0.6322, -0.245,
-0.5325, -0.6341, -0.5214, -0.531, -0.124, -0.0252]

d={}
for k,v in zip([int(i*10) for i in l],l):
   d.setdefault(k,[]).append(v)

LoL=[d[e] for e in sorted(d.keys(), reverse=True)]

for i,l in enumerate(LoL,1):
    print('list',i,l)    

Prints:

list 1 [-0.04325, -0.0252]
list 2 [-0.124]
list 3 [-0.234, -0.245]
list 4 [-0.315]
list 5 [-0.43134]
list 6 [-0.5325, -0.5214, -0.531]
list 7 [-0.6322, -0.6341]

How it works:

1: The list
>>> l=[-0.234, -0.04325, -0.43134, -0.315, -0.6322, -0.245,
... -0.5325, -0.6341, -0.5214, -0.531, -0.124, -0.0252]

2: Produce the keys:
>>> [int(i*10) for i in l]
[-2, 0, -4, -3, -6, -2, -5, -6, -5, -5, -1, 0]

3: Produce tuples to put in the dict:
>>> zip([int(i*10) for i in l],l)
[(-2, -0.234), (0, -0.04325), (-4, -0.43134), (-3, -0.315), (-6, -0.6322), 
 (-2, -0.245), (-5, -0.5325), (-6, -0.6341), (-5, -0.5214), (-5, -0.531), 
 (-1, -0.124), (0, -0.0252)]

4: unpack the tuples into k,v and loop over the list
>>>for k,v in zip([int(i*10) for i in l],l):

5: add k key to a dict (if not there) and append the float value to a list associated 
   with that key:
    d.setdefault(k,[]).append(v)

I suggest a Python tutorial on these statements.