Python - getting values from 2d arrays

Question

I have a 2d array:

[[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []]

How do I call a value from it? For example I want to print (name + " " + type) and get

shotgun weapon

I can't find a way to do so. Somehow print list[2][1] outputs nothing, not even errors.

if you're naming your structure "list", be careful, as list is a reserved word in python. — sahhhm
– sahhhm, Commented Oct 10, 2012 at 19:02
"I have a 2d array" No you don't, you have ragged nested arrays. — Ignacio Vazquez-Abrams
– Ignacio Vazquez-Abrams, Commented Oct 10, 2012 at 19:03

sahhhm · Accepted Answer · 2012-10-10 19:05:23Z

6

>>> mylist = [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'f
ood'], []]
>>> print mylist[2][1]
weapon

Remember a couple of things,

don't name your list, list... it's a python reserved word
lists start at index 0. so mylist[0] would give []
similarly, mylist[1][0] would give 'shotgun'
consider alternate data structures like dictionaries.

answered Oct 10, 2012 at 19:05

sahhhm

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1 Comment

Борис Цейтлин Over a year ago

Would use dictionaries if I didn't plan to add other things into these lists. For example if I have ["shotgun", "weapon", "common"] it is no longer a pair :) Thanks anyway

Rohit Jain · Accepted Answer · 2012-10-10 19:18:43Z

3

Accessing through index works with any sequence (String, List, Tuple): -

>>> list1 = [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []]
>>> list1[1]
['shotgun', 'weapon']
>>> print list1[1][1]
weapon
>>> print ' '.join(list1[1])
shotgun weapon
>>>

You can use join on the list, to get String out of list..

edited Oct 10, 2012 at 19:18

answered Oct 10, 2012 at 19:03

Rohit Jain

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1 Comment

Rohit Jain Over a year ago

Why a down vote?? Do I deserve a comment here from the downvoter??

kreativitea · Accepted Answer · 2012-10-10 19:05:02Z

0

array = [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []]
print " ".join(array[1])

slice into the array with the [1], then join the contents of the array using ' '.join()

answered Oct 10, 2012 at 19:05

kreativitea

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Comments

ronak · Accepted Answer · 2012-10-10 19:09:33Z

In [80]: [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []]
Out[80]: [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []]

In [81]: a = [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []]

In [82]: a[1]
Out[82]: ['shotgun', 'weapon']

In [83]: a[2][1]
Out[83]: 'weapon'

For getting all the list elements, you should use for loop as below.

In [89]: a
Out[89]: [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []]

In [90]: for item in a:
    print " ".join(item)
   ....:     

shotgun weapon
pistol weapon
cheesecake food

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