best way to assign variable length strings to list elements in python3.4

Question

I have a text file that has a variable length of digits ('62554' could be 'xxxx' or 'xxx')

# cat dsset-domain.com.
domain.com.          IN DS 62554 8 1 84988C2B6D3C92F35E1457D3771D0270417622D2
domain.com.          IN DS 62554 8 2 EF940E2D5CFAD8B47A699ACCD68A77C43F120774CABCCA5A25443BE3 1D1BEABF

I need the last 4 strings of the first line assigned to list variables:

list[0] = 62554
list[1] = 8
list[2] = 1
list[3] = 84988C2B6D3C92F35E1457D3771D0270417622D2

But I don't exactly have a delimiter to work with.

What is the best way to slice up a line of strings of variable length and assign them as list elements?

code:

#!/usr/bin/python
import string
import requests

name = input("Enter the domain to provision DS keys for? ")
url = 'https://www.provider.net/ws/domain/'+name+'/ds'


with open('/usr/local/etc/namedb/dsset-'+name+'.', 'rt') as in_file:
        dstext = in_file.read()
print(dstext)

Kasravnd · Accepted Answer · 2015-03-08 08:45:53Z

1

You can just use split ant pickup the last 3 item with slicing :

>>> s="domain.com.          IN DS 62554 8 1 84988C2B6D3C92F35E1457D3771D0270417622D2"
>>> s.split()[-3:]
['8', '1', '84988C2B6D3C92F35E1457D3771D0270417622D2']

answered Mar 8, 2015 at 8:45

Kasravnd

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6 Comments

mine Over a year ago

it says I have to wait 9 min to click the button. Thank you!

Avinash Raj Over a year ago

but he wants to get the values only from the first line.

Kasravnd Over a year ago

@AvinashRaj So OP can apply this just on first line! ;)

mine Over a year ago

@Kasra specifically -> dslist = dstext.split()[3:7] got it. But your concept worked and no loop required.

Kasravnd Over a year ago

@mine yeah! surely! actually always there are more that 1 way to figure out the programming problems, but the winner is the faster!

|

Avinash Raj · Accepted Answer · 2015-03-08 08:47:32Z

0

fileobject.readline function will fetch only the first line.

with open('file') as f:
    l = []
    m = f.readline().split()
    l = m[-4:]
    print(l)

Output:

['62554', '8', '1', '84988C2B6D3C92F35E1457D3771D0270417622D2']

answered Mar 8, 2015 at 8:47

Avinash Raj

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