How to join entries in a set into one string?

Question

Basically, I am trying to join together the entries in a set in order to output one string. I am trying to use syntax similar to the join function for lists. Here is my attempt:

list = ["gathi-109","itcg-0932","mx1-35316"]
set_1 = set(list)
set_2 = set(["mx1-35316"])
set_3 = set_1 - set_2
print set_3.join(", ")

However I get this error: AttributeError: 'set' object has no attribute 'join'

What is the equivalent call for sets?

Asked By: Spencer

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Source

Answer 1

I think you just have it backwards.

print ", ".join(set_3)

Answered By: recursive

Answer 2

', '.join(set_3)

The join is a string method, not a set method.

Answered By: Jmjmh

Answer 3

The join is called on the string:

print ", ".join(set_3)

Answered By: MByD

Answer 4

Nor the set nor the list has such method join, string has it:

','.join(set(['a','b','c']))

By the way you should not use name list for your variables. Give it a list_, my_list or some other name because list is very often used python function.

Answered By: Ski

Answer 5

You have the join statement backwards try:

print ', '.join(set_3)

Answered By: Hunter

Answer 6

Sets don’t have a join method but you can use str.join instead.

', '.join(set_3)

The str.join method will work on any iterable object including lists and sets.

Note: be careful about using this on sets containing integers; you will need to convert the integers to strings before the call to join. For example

set_4 = {1, 2}
', '.join(str(s) for s in set_4)

Answered By: Jack Edmonds

Answer 7

Set’s do not have an order – so you may lose your order when you convert your list into a set, i.e.:

>>> orderedVars = ['0', '1', '2', '3']
>>> setVars = set(orderedVars)
>>> print setVars
('4', '2', '3', '1')

Generally the order will remain, but for large sets it almost certainly won’t.

Finally, just incase people are wondering, you don’t need a ‘, ‘ in the join.

Just: ”.join(set)

🙂

Answered By: John

Answer 8

I wrote a method that handles the following edge-cases:

Set size one. A ", ".join({'abc'}) will return "a, b, c". My desired output was "abc".
Set including integers.
Empty set should returns ""

def set_to_str(set_to_convert, separator=", "):
        set_size = len(set_to_convert)
        if not set_size:
            return ""
        elif set_size == 1:
            (element,) = set_to_convert
            return str(element)
        else:
            return separator.join(map(str, set_to_convert))

Answered By: Fernando Irarrázaval G

How to join entries in a set into one string?

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