Python - Dynamic PHP-like arrays

Question

I' trying to create a PHP like array in python. In Perl it would be a hash...

I want to organize content from the database in an array for easier access.

Something like:

myarray[db_numeric_value1][db_numeric_value2] = db_str_value

But no luck so far...

I tried to initialize myarray as an object list (myarray = {}) or as an array (myarray = [])... Also tried to initialize the "subarrays" but did not work either...

Thanks for your help!

Ron

see this amazing answer

georg
– georg

2012-06-01 08:09:09 +00:00
Commented Jun 1, 2012 at 8:09 — georg
– georg, Commented Jun 1, 2012 at 8:09

claperius · Accepted Answer · 2012-06-01 08:42:54Z

2

you may use python's defaultdict with proper "default_factory":

from collections import defaultdict
myarray = defaultdict(dict)
myarray[4][5] = 34

answered Jun 1, 2012 at 8:42

claperius

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Comments

Diego Navarro · Accepted Answer · 2012-06-01 08:07:32Z

1

In Python it would be a dictionary (see python data structures)

In [4]: myarray = {3: {4: 'Hello World'}}

In [5]: myarray[3][4]
Out[5]: 'Hello World'

EDIT: the same thing but without initializing first

In [6]: myarray = {}
In [7]: myarray[3] = {}
In [9]: myarray[3][4] = 'Hello World'

In [10]: myarray[3][4]
Out[10]: 'Hello World'

Dictionary indexes can be also variables:

myarray[myindex] = myvalue

edited Jun 1, 2012 at 8:07

answered Jun 1, 2012 at 7:59

Diego Navarro

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6 Comments

Ron Over a year ago

AFAIK I tried to use a list when I initialized myarray with these brackets: []... When do this, Python tells me that my list index is out of range... The thing is that its a dynamical list so there should be no boundry, right?

Ron Over a year ago

Thanks for the code snippet...but how do I do this dynamically. The thing is that I dont know my values because I get them from my database...

Ron Over a year ago

Ok... I really think I'm missing something... When I try your static code it works just fine. As soon as I put a variable between the brackets he complains... the error is just the key. for example: myarray[val] = "foo" then the error is just val, ie. 3

Daniel Roseman Over a year ago

Show the exact code that fails, including all setup steps and the traceback.

Diego Navarro Over a year ago

myarray always has to be a dictionary first: myarray = {}

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