python - AttributeError when converting a list of strings to a list of sets -

i'm trying write function add results of loop set, taking list , using set() take out duplicate letters in strings within list.

however; whenever run code, hit error says .add isn't dict definition.

def make_itemsets(l):     item_set = {}     item in l:         item_set.add(set(item))         return item_set         2     item_set = {}       3     item in l: ----> 4         item_set.add(set(item))       5         return item_set       6   attributeerror: 'dict' object has no attribute 'add' 

any ideas? i'm trying list (l = ["apples","bananas","carrot"] run through function i've created return new list [{'a','p','l','e','s'},{'b','a','n','s'} etc. etc.]

it seems want list of sets instead. how about:

def make_itemsets(l):     items = []     item in l:         items.append(set(item))      return items 

note return statement outside loop. shorter version using list comprehension entail:

def make_itemsets(l):     return [set(item) item in l] 

or, shorter version using map:

def make_itemsets(l):     return list(map(set, l)) 

you can drop list(...) if you're on python2. calling 1 of these functions returns:

>>> s = make_itemsets(["apples","bananas","carrot"]) >>> s [{'a', 'e', 'l', 'p', 's'}, {'a', 'b', 'n', 's'}, {'a', 'c', 'o', 'r', 't'}] 

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for reference, if you're trying create empty set, you'll need

item_set = set() 

{} happens create empty dict. have @ disassembled byte code:

>>> dis.dis("{}")   1           0 build_map                0               3 return_value 

the 0 build_map stmt creates map (aka, dictionary). contrast with:

>>> dis.dis("set()")   1           0 load_name                0 (set)               3 call_function            0 (0 positional, 0 keyword pair)               6 return_value