Error: int object does not support item assignment

[ankita_nthu]

Dear All,

I want to know how to remove this type of error. In this code i want to flip the values. But if I flip by giving 1D array index it flips and no error but if i have 2D List its not working and give this error. Please help me in this regard. What I have to change.

My part of code in error is below:
For example:one part of decoding process

add_attempt=4
LLR_L = signal.copy() * 2 / pow(sigma, 2)
LLR_L_ = LLR_L
    
indexes = np.argsort(np.abs(LLR_L))[:add_attempt]

comb =[]
    for i in indexes:
        comb.append(i)

COMB = []
    for L in range(0, len(comb) + 1):
        for subset in itertools.combinations(comb, L):
            COMB.append(subset)

   for i_flip in range(len(COMB)):
       L[:, n] = LLR_L_
           decoding process function here( if fails)
           else:
              LLR_L_ = LLR_L
              for j in range(len(COMB[i_flip])):
                  if LLR_L[COMB[i_flip][j]] > 0:
                     LLR_L_[COMB[i_flip][j]] = (-1) * 10
                  else:
                     LLR_L_[COMB[i_flip][j]] = 10

This code have an output I print just to know what is stored in these functions and error

Output:
indexes [ 3 14  5 22]
comb [3, 14, 5, 22]

COMB [(), (3,), (14,), (5,), (22,), (3, 14), (3, 5), (3, 22), (14, 5), (14, 22), (5, 22), (3, 14, 5), (3, 14, 22), (3, 5, 22), (14, 5, 22), (3, 14, 5, 22)]

error

Output:
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\multiprocessing\pool.py", line 119, in worker
    result = (True, func(*args, **kwds))
  File "C:\Users\ankita1268\Desktop\CRC-BP-Multi-G\main_Iter_mflip.py", line 120, in func
    polar_decoded_llr, a = polar_codes_iter_mflip.FG_decode(signal, polar_iter_num, stage_num, frozen_indexes, info_indexes, B_N, sigma, BIG_NUM, perm[perm_idx], alpha, beta, threshold, H_CRC,T)
  File "C:\Users\ankita1268\Desktop\CRC-BP-Multi-G\polar_codes_iter_mflip.py", line 203, in FG_decode
    L[:, n] = LLR_L_
TypeError: 'int' object does not support item assignment
"""
[color=#E74C3C] L[:, n] = LLR_L_
TypeError: 'int' object does not support item assignment[/color]

But this code runs if I have the last part of code as below:

   for i_flip in range(add_attempt):
      L[:, n] = LLR_L_
           decoding process function here( if fails)
           else:
           LLR_L_ = LLR_L
           if LLR_L[indexes[i_flip]] > 0:
               LLR_L_[indexes[i_flip]] = (-1) * 10
           else:
               LLR_L_[indexes[i_flip]] = 10

[ichabod801]

As the error says, L is an integer. On line 12 you set it as an integer by using it as the loop variable in the for loop. Then on line 17 when you try to index it, you get the error. You can't index integers, only containers.

It's not clear what you expect L to be. It's not defined previously in the code you posted, but your error indicates there's a lot of code you didn't post. If you previously defined it to be something else, change the name of your loop variable on line 12.

[ankita_nthu]

oh sorry ,

I did this silly mistake on line 12 ,

Thank you very much