Idiomatic Python to convert list to dict

[Diez B. Roggisch]

James Fassett schrieb:
> Hi all,
> 
> Simple question really on a best practice. I want to avoid adding
> duplicates to a list.
> 
> my_list = ['a', 'b', 'c', 'd', 'e']
> dup_map = {}
> for item in my_list:
>     dup_map[item] = True
> 
> # ... sometime later
> 
> for complex_dict in large_list:
>     if complex_dict["char"] not in dup_map:
>         my_list.append(complex_dict["char"])
>         dup_map[complex_dict["char"]] = True
> 
> For the first part (generating the duplicate map) is there a more
> idiomatic Python method for flipping the list into a dict?
> 
> Is there a better way to achieve the overall objective (as hinted at
> by the above algorithm)?
> 
> Thanks in advance for any tips.

Instead of a dict, use a set. It's immediatly contructable from my_list, 
and better suited for the task anyway.

Diez