How To Create 2d Arrays In Python

Im trying to create an indexed 2D array within Python, but I keep running into errors, one way or another. The following code: #Declare Constants (no real constants in Python) PLAY

Solution 1:

i think you should have a look at python's data structures tutorial and what you're looking for is called a dictionary here, which is a list of key-value pairs.

in your case, you could use a nested dictionary as a value for a key, so that you could call

## just examples for you ##player_dict_info = {'x':0, 'y':0, 'ammo':0}
enemy_dict_info = {'x':0, 'y':0, 'ammo':0}
information_state = {'player': player_dict_info, 'enemy': enemy_dict_info}

and access every element like you did in php

Solution 2:

You want a dict (as associative array/map) which in python is defined with {}. [] is python's list datatype.

state = {
    "PLAYER": {
        "x": 0, 
        "y": 0, 
        "ammo": 0, 
        "state": 0, 
        "last": 0
    }, 
    "ENEMY": {
        "x": 0, 
        "y": 0, 
        "ammo": 0, 
        "state": 0, 
        "last": 0
    }
}

Solution 3:

You can have a list of lists, for example:

In [1]: [[None]*3for n inrange(3)]
Out[1]: [[None, None, None], [None, None, None], [None, None, None]]

In [2]: lol = [[None]*3for n inrange(3)]

In [3]: lol[1][2]

In [4]: lol[1][2] ==NoneOut[4]: True

BUT all python lists are indexed by integer. If you want to index by a string, you need a dict.

In this case, you might like a defaultdict:

In [5]: from collections import defaultdict

In [6]: d = defaultdict(defaultdict)

In [7]: d['foo']['bar'] = 5

In [8]: d
Out[8]: defaultdict(<type'collections.defaultdict'>, {'foo': defaultdict(None, {'bar': 5})})

In [9]: d['foo']['bar']
Out[9]: 5

That said, if you are storing identical sets of fields, it might be best to create a class, instantiate objects from it, and then just store the objects.