LIst Comprehensions: References to the Components

Question

In sum: I need to write a List Comprehension in which i refer to list that is being created by the List Comprehension.

This might not be something you need to do every d

Answer 1

As far as I know, there is no way to access a list comprehension as it's being built.

As KennyTM mentioned (and if the order of the entries is not relevant), then you can use a set instead. If you're on Python 2.7/3.1 and above, you even get set comprehensions:

{ some_function(s) for s in raw_data }

Otherwise, a for loop isn't that bad either (although it will scale terribly)

l = []
for s in raw_data:
    item = somefunction(s)
    if item not in l:
        l.append(item)