[FIXED] Python List Comprehensions Adding integer in to diffrent list?

Issue

I am faced issue with a list comprehension missing value in a result list. I have two lists. when i am trying with for loop. value is expected as i want to like(7 4 2 -1 0) but i don't need integer values in need list. when use list comprehension i got only 4 value [4, 2, -1, 0]. i don't understand what happens in my logic. if there is anyone you help me kindly see a code.

l1 = [3, 6, 9, 2, 11, 14, 13]
f = [7]

subtraction l1 last element to l1 nth element. I am trying this formula(pls see code more understandable):

l2 = l1[-1]-l1[n]

and after that, i am trying to put if else condition in like this:

if l2 <= f:
        print(l3)

this is the code I am trying in for loop

In [230]: for l2 in l1:
 ...:     l3 = l1[-1]-l2
 ...:     #print(l3)
 ...:     for f1 in f:
 ...:         if l3<=f1:
 ...:             print(l3)
 ...:             
 ...:         
7
4
2
-1
0

And for the List Comprehension code is:

  for f1 in f:
      f1

In [47]: l1 = [x[-1] - l for l in x if l >= int(f1)]
...: 

In [48]: l1
Out[48]: [4, 2, -1, 0]

Solution

Your list comprehension does not match with your for loop.
You must replace:

[x[-1] - l for l in x if l >= int(f1)]

with:

[(l1[-1] - l) for l in l1 if (l1[-1] - l) <= int(f1)]

which gives the expected output.

(I added parentheses for better readability)

Answered By - Laurent H.