CODEWITHSUNDEEP
pythonpython-3.x
DPK
DPK

Reputation: 55

List index out of range error - Help requested

I am trying to get the fist item in each line within the bgp_summary string and create a new list of these. I am using below code for this purpose, but getting "list index out of range" error. I believe that the list index I am referring is not out of range but not sure why this error is happening. Would appreciate if some one can help.

bgp_summary = """

10.0.13.213     65510    658     86       0       0  2d 3:43:06 Establ
172.46.42.134   65513    819     7        0      11  2d 3:50:49 Establ
172.57.13.1     65501    15427   52       0       0  0d 2:26:01 Establ
172.57.13.249   65513    13449   2517     0       0  2d 3:50:21 Establ
172.57.13.250   65513    134     2515     0       0  4d 3:50:21 Establ
172.57.13.252   65513    46      142      0       0     3:50:32 Establ

"""

bgp_peers_list_raw = []
bgp_peers_list_refined = []
bgp_peers_list_raw = bgp_summary.splitlines()

n=0
for n in range (len(bgp_peers_list_raw)):
    list_raw1 = []
    list_raw1 = bgp_peers_list_raw[n].split()
    bgp_peers_list_refined.append(list_raw1[0])


bgp_peers_list_refined.append(list_raw1[0])
IndexError: list index out of range

Upvotes: 2

Views: 41

Answers (2)

Mantas Kandratavičius
Mantas Kandratavičius

Reputation: 1508

This is happening because bgp_summary has some empty lines.

The easiest and most straight forward solution is to convert your bgp_summary from:

bgp_summary = """

10.0.13.213     65510    658     86       0       0  2d 3:43:06 Establ
172.46.42.134   65513    819     7        0      11  2d 3:50:49 Establ
172.57.13.1     65501    15427   52       0       0  0d 2:26:01 Establ
172.57.13.249   65513    13449   2517     0       0  2d 3:50:21 Establ
172.57.13.250   65513    134     2515     0       0  4d 3:50:21 Establ
172.57.13.252   65513    46      142      0       0     3:50:32 Establ

"""

to:

bgp_summary = """10.0.13.213     65510    658     86       0       0  2d 3:43:06 Establ
172.46.42.134   65513    819     7        0      11  2d 3:50:49 Establ
172.57.13.1     65501    15427   52       0       0  0d 2:26:01 Establ
172.57.13.249   65513    13449   2517     0       0  2d 3:50:21 Establ
172.57.13.250   65513    134     2515     0       0  4d 3:50:21 Establ
172.57.13.252   65513    46      142      0       0     3:50:32 Establ"""

which while not as nice looking fixes your problem.

A more complicated solution that leaves your bgp_summary untouched would be a small modification to your for loop.

Instead of checking every line like this:

range(len(bgp_peers_list_raw))

You could exclude the empty ones at the start and at the end like this:

#2 empty lines at the start
#1 empty line at the end
range(2, len(bgp_peers_list_raw)-1)

Upvotes: 0

Stephen Rauch
Stephen Rauch

Reputation: 49812

Some of your lines are empty. If you discard those like:

Code:

bgp_peers_list_raw = [l.strip() for l in bgp_summary.splitlines() 
                      if l.strip()]

It will work fine.

Test Code:

bgp_summary = """

10.0.13.213     65510    658     86       0       0  2d 3:43:06 Establ
172.46.42.134   65513    819     7        0      11  2d 3:50:49 Establ
172.57.13.1     65501    15427   52       0       0  0d 2:26:01 Establ
172.57.13.249   65513    13449   2517     0       0  2d 3:50:21 Establ
172.57.13.250   65513    134     2515     0       0  4d 3:50:21 Establ
172.57.13.252   65513    46      142      0       0     3:50:32 Establ

"""

bgp_peers_list_raw = []
bgp_peers_list_refined = []
bgp_peers_list_raw = [l.strip() for l in bgp_summary.splitlines()
                      if l.strip()]

n = 0
for n in range(len(bgp_peers_list_raw)):
    list_raw1 = []
    list_raw1 = bgp_peers_list_raw[n].split()
    bgp_peers_list_refined.append(list_raw1[0])

bgp_peers_list_refined.append(list_raw1[0])
print(bgp_peers_list_refined)

Results:

['10.0.13.213', '172.46.42.134', '172.57.13.1', '172.57.13.249',
 '172.57.13.250', '172.57.13.252', '172.57.13.252']

Upvotes: 2

Related Questions