“TypeError: ‘set’ object is not subscriptable in Python” is a common error that shows up in many ways. In this article we will give you some solutions to fix it. Read on it.

When Do You Get The Error “TypeError: ‘set’ object is not subscriptable in Python”?

When you try to slice or index a set, you easily get the following error message:

TypeError: 'set' object is not subscriptable in Python

You’re attempting to use indexing to access a set’s elements. Indexing, slicing, and any other sequence-like behavior are not supported by set objects. Therefore, the error “TypeError: ‘set’ object is not subscriptable in Python” happens.

How To Solve The Error “TypeError: ‘set’ object is not subscriptable in Python”?

Solution 1: Use the built-in list() function

To fix the problem “TypeError: ‘set’ object is not subscriptable in Python”, you can use the built-in list() function to change the list to a set. After that, let’s use indexing to access the last element of the list. Look at the following program:

# Specify set
numbers = {2, 4, 6, 7, 8}

# Change set to list
numbers_list = list(numbers)

# Changed list
print(numbers_list)

# Verifying type is list
print(type(numbers_list))

# The last element in the list
print(f'The last number in the list is: {numbers_list[-1]}')

Output

[2, 4, 6, 7, 8] 
<class 'list'> 
The last number in the list is: 8

Solution 2: Use colons to specify a dictionary

Another cause of this issue is that a set instead of a dictionary is wrongly created, and then you attempt to access it via indexing. In this case, you have to use colons to specify a dictionary to solve the problem “TypeError: ‘set’ object is not subscriptable in Python”. Look at the code below:

shop = {"T-shirt":25, "jeans":10, "dress":40, "shoes":20, "sandals":50} 
inventory = [] 
hat = 100 
def buy(item, hat): 
    if hat >= shop[item]: 
        print(f'You have bought: {item}') 
        inventory.append(item) 
        hat -= shop[item] 
        print(f'You have {hat} hat remaining') 
    else: 
        print(f'Sorry you do need {shop[item]} hat to buy: {item}') 
item = input("What item would you like to buy for your quest?: ") 
buy(item, hat)

Output

What item would you like to buy for your quest?: T-shirt
You have bought: T-shirt
You have 75 hats remaining

Solution 3: Use itertools.islice in a while loop

If you want to obtain 200 items at a time from the iterator which is built from the supplied set, you can use itertools.islice in a while loop as shown below:

from itertools import islice

def create(ids): 
    policy = { 
        'Statement': [] 
    } 
    i = iter(ids) 
    while True: 
        chunk = list(islice(i, 200)) 
        if not chunk: 
            break 
        policy['Statement'].append({ 
            'Principal': { 
                'AWS': list(map(lambda id: f"arn:aws:iam::{id}:root", chunk)) 
            } 
        }) 
    return policy

Conclusion

You can always reread this post when you’re still stuck on “TypeError: ‘set’ object is not subscriptable in Python“. The options mentioned above are the quickest. In addition, if you still need help or have problems, we have a large population where everyone is usually eager to help. Finally, we wish all of you a wonderful day full of new code alternatives and appreciate your reading time.

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