[Tutor] nested list help

[Vikram K]

Suppose i have this nested list:

>>> x
[['NM100', 3, 4, 5, 6, 7], ['NM100', 10, 11, 12, 13], ['NM200', 15, 16, 17]]
>>> for i in x:
...   print i
...
['NM100', 3, 4, 5, 6, 7]
['NM100', 10, 11, 12, 13]
['NM200', 15, 16, 17]
>>>

how do i obtain from the above the following nested list:

>>> z
[['NM100', 3, 4, 5, 6, 7, 10, 11, 12, 13], ['NM200', 15, 16, 17]]
>>> for i in z:
...   print i
...
['NM100', 3, 4, 5, 6, 7, 10, 11, 12, 13]
['NM200', 15, 16, 17]
>>>
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[Tutor] string to list

[Vikram K]

Suppose i have this string:
z = 'AT/CG'

How do i get this list:

zlist = ['A','T/C','G']
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[Tutor] python hyperlinks question

[Vikram K]

I have a bunch of symbols in one of the columns in my program's output
file (a csv file which can be opened in excel). I wish to add
hyperlinks to each entry in this particular column in my output file.
A sample symbol/entry in the specific column of interest in the output
file is USP8 and it needs to be hyperlinked to
http://www.ncbi.nlm.nih.gov/gene/9101. (So, when you click on 'USP8'
in the output file, your browser automatically opens the site
http://www.ncbi.nlm.nih.gov/gene/9101).

Could you please tell me how to add hyperlinks to my output?
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[Tutor] reading very large files

[Vikram K]

I wish to read a large data file (file size is around 1.8 MB) and manipulate
the data in this file. Just reading and writing the first 500 lines of this
file is causing a problem. I wrote:

fin = open('gene-GS00471-DNA_B01_
1101_37-ASM.tsv')
count = 0
for i in fin.readlines():
print i
count += 1
if count >= 500:
break

and got this error msg:

Traceback (most recent call last):
  File
"H:\genome_4_omics_study\GS03696-DID\GS00471-DNA_B01_1101_37-ASM\GS00471-DNA_B01\ASM\gene-GS00471-DNA_B01_1101_37-ASM.tsv\test.py",
line 3, in 
for i in fin.readlines():
MemoryError

---
is there a way to stop python from slurping all the  file contents at once?
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[Tutor] nested list query

[Vikram K]

Suppose i have the following nested list:

>>> x
[['19600894', '1', 'chr15_76136768', 'MISSENSE'], ['19600894', '2',
'chr15_76136768', 'MISSENSE'], ['18467762', '1', 'chr14_23354066',
'MISSENSE']]


How do i obtain from nested list x (given above), the following nested list
z:

>>> z
[['chr15_76136768', 'MISSENSE'], ['chr14_23354066', 'MISSENSE']]


--
In other words, if the third element of an element of x is the same, then i
wish to combine it into a single element.
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