Ever needed to access a python dictionary from a django template? It's pretty straightforward:
{{dictionary.key}} will get you that.

but ever needed to do it inside a loop, with a variable key? django will not allow you to do this default (after finding a solution that worked, i can't BELIEVE that it isn't a part of django already. maybe it is in the new version?)

anyway, i wrote a custom template tag which allows me to access the keys of a dictionary using a variable:

from django import template
register = template.Library()

def dict_get(value, arg):
    #custom template tag used like so:
    #{{dictionary|dict_get:var}}
    #where dictionary is duh a dictionary and var is a variable representing
    #one of it's keys

    return value[arg]

register.filter('dict_get',dict_get)

now, {{dictionary|dict_get:var}}, where var is one of the dictionary keys, will give me exactly what i want.

update:
there is a big difference that i didn't make obvious in my post.

in view:
dict = {'1':True,'3':False,'5':True}
arr = [1,2,3,4,5]

in template:
{{dict.5}} #evaluates to True
{% for key in arr %}
{{dict.key}} #does not work
{{dict|dict_get:key}} #WORKS!
{% endfor %}