Python / IPython奇怪的不可重现列表索引超出范围错误(Python/IPython strange non reproducible list index out of range error)

 我最近学习了一些Python以及如何将它应用到我的工作中。 我已成功编写了几个脚本，但我遇到了一个我无法弄清楚的问题。 
 
 我打开的文件大约有4000行，每行有两个制表符分隔的列。 在读取输入文件时，我收到索引错误，指出列表索引超出范围。 然而，虽然我每次都得到错误，但每次都不会在同一行上发生错误（因为，每次都会在不同的行上抛出错误！）。 因此，由于某种原因，它通常有效，但随后（看似）随机失败。 
 
 因为我上周才开始学习Python，所以我很难过。 我已经四处寻找同样的问题，但没有找到类似的东西。 此外，我不知道这是一个特定于语言或IPython的问题。 任何帮助将不胜感激！ 
 
input = open("count.txt", "r")
changelist = []
listtosort = []
second = str()

output = open("output.txt", "w")

for each in input:
    splits = each.split("\t")
    changelist = list(splits[0])
    second = int(splits[1])

print second

if changelist[7] == ";":   
    changelist.insert(6, "000")
    va = "".join(changelist) 
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

elif changelist[8] == ";":   
    changelist.insert(6, "00")
    va = "".join(changelist) 
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

elif changelist[9] == ";":   
    changelist.insert(6, "0")
    va = "".join(changelist) 
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

else:
    #output.write(str("".join(changelist)))
    va = "".join(changelist)
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

output.close()
 
 错误 
 
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
/home/a/Desktop/sharedfolder/ipytest/individ.ins.count.test/<ipython-input-87-32f9b0a1951b> in <module>()
     57     splits = each.split("\t")
     58     changelist = list(splits[0])
---> 59     second = int(splits[1])
     60 
     61     print second

IndexError: list index out of range
 
 输入： 
 
ID=cds0;Name=NP_414542.1;Parent=gene0;Dbxref=ASAP:ABE-0000006,UniProtKB%2FSwiss-Prot:P0AD86,Genbank:NP_414542.1,EcoGene:EG11277,GeneID:944742;gbkey=CDS;product=thr 12
ID=cds1000;Name=NP_415538.1;Parent=gene1035;Dbxref=ASAP:ABE-0003451,UniProtKB%2FSwiss-Prot:P31545,Genbank:NP_415538.1,EcoGene:EG11735,GeneID:946500;gbkey=CDS;product=deferrrochelatase%2C  50
ID=cds1001;Name=NP_415539.1;Parent=gene1036;Note=PhoB-dependent%2C  36
 
 期望的输出： 
 
ID=cds0000;Name=NP_414542.1;Parent=gene0;Dbxref=ASAP:ABE-0000006,UniProtKB%2FSwiss-Prot:P0AD86,Genbank:NP_414542.1,EcoGene:EG11277,GeneID:944742;gbkey=CDS;product=thr  12
ID=cds1000;Name=NP_415538.1;Parent=gene1035;Dbxref=ASAP:ABE-0003451,UniProtKB%2FSwiss-Prot:P31545,Genbank:NP_415538.1,EcoGene:EG11735,GeneID:946500;gbkey=CDS;product=deferrrochelatase%2C  50
ID=cds1001;Name=NP_415539.1;Parent=gene1036;Note=PhoB-dependent%2C  36

I have recently been learning some Python and how to apply it to my work. I have written a couple of scripts successfully, but I am having an issue I just cannot figure out.
 
I am opening a file with ~4000 lines, two tab separated columns per line. When reading the input file, I get an index error saying that the list index is out of range. However, while I get the error every time, it doesn't happen on the same line every time (as in, it will throw the error on different lines everytime!). So, for some reason, it works generally but then (seemingly) randomly fails.
 
As I literally only started learning Python last week, I am stumped. I have looked around for the same problem, but not found anything similar. Furthermore I don't know if this is a problem that is language specific or IPython specific. Any help would be greatly appreciated!
 
input = open("count.txt", "r")
changelist = []
listtosort = []
second = str()

output = open("output.txt", "w")

for each in input:
    splits = each.split("\t")
    changelist = list(splits[0])
    second = int(splits[1])

print second

if changelist[7] == ";":   
    changelist.insert(6, "000")
    va = "".join(changelist) 
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

elif changelist[8] == ";":   
    changelist.insert(6, "00")
    va = "".join(changelist) 
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

elif changelist[9] == ";":   
    changelist.insert(6, "0")
    va = "".join(changelist) 
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

else:
    #output.write(str("".join(changelist)))
    va = "".join(changelist)
    var = va + ("\t") + str(second)
    listtosort.append(var)
    output.write(var)

output.close()
 
The error
 
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
/home/a/Desktop/sharedfolder/ipytest/individ.ins.count.test/<ipython-input-87-32f9b0a1951b> in <module>()
     57     splits = each.split("\t")
     58     changelist = list(splits[0])
---> 59     second = int(splits[1])
     60 
     61     print second

IndexError: list index out of range
 
Input:
 
ID=cds0;Name=NP_414542.1;Parent=gene0;Dbxref=ASAP:ABE-0000006,UniProtKB%2FSwiss-Prot:P0AD86,Genbank:NP_414542.1,EcoGene:EG11277,GeneID:944742;gbkey=CDS;product=thr 12
ID=cds1000;Name=NP_415538.1;Parent=gene1035;Dbxref=ASAP:ABE-0003451,UniProtKB%2FSwiss-Prot:P31545,Genbank:NP_415538.1,EcoGene:EG11735,GeneID:946500;gbkey=CDS;product=deferrrochelatase%2C  50
ID=cds1001;Name=NP_415539.1;Parent=gene1036;Note=PhoB-dependent%2C  36
 
Desired output:
 
ID=cds0000;Name=NP_414542.1;Parent=gene0;Dbxref=ASAP:ABE-0000006,UniProtKB%2FSwiss-Prot:P0AD86,Genbank:NP_414542.1,EcoGene:EG11277,GeneID:944742;gbkey=CDS;product=thr  12
ID=cds1000;Name=NP_415538.1;Parent=gene1035;Dbxref=ASAP:ABE-0003451,UniProtKB%2FSwiss-Prot:P31545,Genbank:NP_415538.1,EcoGene:EG11735,GeneID:946500;gbkey=CDS;product=deferrrochelatase%2C  50
ID=cds1001;Name=NP_415539.1;Parent=gene1036;Note=PhoB-dependent%2C  36