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TypeError: object 'set' does not support indexing

I just did some random stuff in Python 3.5. And with 15 minutes of free time, I came up with this:

a = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
 "x", "y", "z"}
len_a = len(a)
list = list(range(0, len_a))
message = ""
wordlist = [ch for ch in message]
len_wl = len(wordlist)
for x in list:
    print (a[x])

But the satisfaction with a sense of accidental success did not surpass me. Instead, a sense of failure:

Traceback (most recent call last):
File "/Users/spathen/PycharmProjects/soapy/soup.py", line 9, in  <module>
print (a[x])
TypeError: 'set' object does not support indexing

Please, help

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4 answers


Try square brackets:

a = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
 "x", "y", "z"]


ie: use list

insteadset

+3


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As the error message says, set

doesn't really support indexing, but a

- this set

, since you used a set of literals (curly braces) to specify its elements (available since Python 3.1). However, to retrieve items from a set, you can simply iterate over them:



for i in a:
    print(i)
+2


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try changing your code like this.

a = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", 
      "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
      "x", "y", "z"}
list_a = list(a)
len_a = len(a)
list = list(range(0, len_a))
message = ""
wordlist = [ch for ch in message]
len_wl = len(wordlist)
for x in list:
   print list_a[x]

set does not support indexing, but list does, so here I am converting set to list and getting the index of the list.

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@Sakib, your set is a

already iterating over. Please consider using this updated code instead of accessing elements by index.

a = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"}
for x in a:
  print ( x )

Also, your code doesn't show enough intent for us to help you achieve your ultimate goal. Examples:

  • range()

    also returns an iterable type, so there is no reason to convert it to list

  • It's not a bad practice to reuse (rewrite) a keyword list

    , and this will lead to even more problems.
  • len_wl

    does not serve the purpose
  • Because of # 3 neither wordlist

    , nor message

    have a purpose either

Hope it helps

PS - don't forget to choose an answer

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