List index out of range error in the code

Question

I have the following piece of code.

result = "1/1/2010|1/2/2111"
request = "1/1/1.3.4.5.6/1/1/127.0.0.1"

replylist = result.split("|")
finalresultlist = [
    f"{i.split('/')[2]}.{j.split('/')[2]}"
        for i in request
        for j in replylist \
        if (i.split("/")[1] == j.split("/")[1])
]

print(finalresultlist)

Note: The f"{i.split('/')[2]}.{j.split('/')[2]}" concatenates the "1.3.4.5.6" with the "2010" when there is a match if (i.split("/")[1] == j.split("/")[1]) based on the value in the index [1] after each of the result and request strings are split on the '|'.

I want to return a new string, which concatenates the 1.3.4.5.6 of request with 2010 of result to return a list which contains the string: ["1.3.4.5.6.2010"]

In my current code, I get the error "list out of range". I am unable to resolve this issue.

Any help is appreciated.

request is a string, and iterating over it (for i in request) gives you one character at a time. It looks to me like you're trying to do too many things at once. — molbdnilo
– molbdnilo, Commented Aug 27, 2019 at 14:35
@molbdnilo May you help me to resolve my bug. I want to be able to concatenate the 1.3.4.5.6 with the 2010. — Laura Smith
– Laura Smith, Commented Aug 27, 2019 at 14:38
It would be great if you could post the stacktrace of the error. — Ganesh Tata
– Ganesh Tata, Commented Aug 27, 2019 at 14:44
It might help your understanding to convert the list comprehension to a for-loop and avoid using f-strings. — wjandrea
– wjandrea, Commented Aug 27, 2019 at 14:56

wjandrea · Accepted Answer · 2019-08-27 15:45:04Z

Debugging

As molbdnilo commented,

request is a string, and iterating over it (for i in request) gives you one character at a time. It looks to me like you're trying to do too many things at once.

And if we look at the full error message including stack trace, we see a suggestion of that:

Traceback (most recent call last):
  File "/home/wjandrea/test.py", line 7, in <module>
    for i in request
  File "/home/wjandrea/test.py", line 9, in <listcomp>
    if (i.split("/")[1] == j.split("/")[1])
IndexError: list index out of range

Rearranging the code points to i.split("/")[1] being the problem.

Solution

Remove for i in request entirely, and substitute request for i.

finalresultlist = [
    f"{request.split('/')[2]}.{j.split('/')[2]}"
    for j in replylist
    if request.split("/")[1] == j.split("/")[1]
]

Output: ['1.3.4.5.6.2010']

Then there are some other improvements we could make, like better variable names and moving stuff out of the list comprehension.

replies = [i.split('/') for i in result.split("|")]
request_list = request.split('/')

final_result_list = [
    f"{request_list[2]}.{reply[2]}"
    for reply in replies
    if request_list[1] == reply[1]
]

print(final_result_list)

user11751463 · Accepted Answer · 2019-08-27 14:51:18Z

2

Ok let's take baby steps.

result = "1/1/2010|1/2/2111"
result = result.split("|")

Now result is ['1/1/2010', '1/2/2111']

request = "1/1/1.3.4.5.6/1/1/127.0.0.1"
request = request.split("/")

Now request is ['1', '1', '1.2.3.4.5.6', '1', '1', '127.0.0.1'] So a simple way to get your desired result would be,

finalresult = "{}{}".format(request[2],result.split('/')[2])

I'm not sure of your looping logic, however, you should be able to use this code to programmatically generate more strings based on your business logic.

answered Aug 27, 2019 at 14:51

user11751463

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