IndexError: list index out of range python insert to 2d array(list)

Question

hey guys i have a question about 2d lists in python that's my code :

results = []
with open("p100001.psv") as csvfile:
    reader = csv.reader(csvfile)
    for row in reader: 
        results.append((str(row).split("|")))




final=[[[]]]

k = 0
while k < (len(results)-7):
    for i in range(1+k,7+k):
        h = 0
        for j in range(0,41):
            final[k].insert((41*(h)+j),results[i][j])
        h = h+1    
    k = k+1

when k=0 and code inserting final[0] everything is ok and code working but when code continue and k=1 i have face this error for final[1] : IndexError: list index out of range

final only has 1 element. There's no final[1] so how can you insert into it? — Barmar
– Barmar, Commented Mar 30, 2020 at 15:57

Nilanka Manoj · Accepted Answer · 2020-03-30 16:07:18Z

1

You cannot insert to final[k] without having the element in the list. So, you have to insert an empty list to final list in every iteration.

final=[]
k = 0
while k < (len(results)-7):
    final.append([[]])
    for i in range(1+k,7+k):
        h = 0
        for j in range(0,41):
            final[k].insert((41*(h)+j),results[i][j])
        h = h+1    
    k = k+1

edited Mar 30, 2020 at 16:07

answered Mar 30, 2020 at 16:01

Nilanka Manoj

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