How to convert single string and multiple strings to a valid set() in python?

Question

Let's assume I read the following strings out of a file:

s1 = "{'XXX-YYY'}"
s2 = "{'XXX-YYY', 'XXX-ZZZ', 'XXX-AAA', 'XXX-BBB'}"

I want convert both strings to valid sets. I tried this:

s1 = {s1}
s2 = set((s2, ))

The outcome is obviously not a valid set():

{"{'XXX-YYY'}"}
{"{'XXX-YYY', 'XXX-ZZZ', 'XXX-AAA', 'XXX-BBB'}"}

It should be:

{'XXX-YYY'}
{'XXX-YYY', 'XXX-ZZZ', 'XXX-AAA', 'XXX-BBB'}

How can I achieve this?

Your second set is not valid, it wil only keep 'XXX-YYY' once. Is it what you want? If you want to keep all similar items, you must create a list — IoaTzimas
– IoaTzimas, Commented Oct 9, 2020 at 8:29
Sorry, I just added a wrong example, now it should be okay. My problem is obviously the string handling. — JohnnyFromBF
– JohnnyFromBF, Commented Oct 9, 2020 at 8:31

IoaTzimas · Accepted Answer · 2020-10-09 08:39:35Z

1

Try this:

s1=s1.replace('{', '').replace('}', '').replace("'", '')
s1=[k.strip() for k in s1.split(',')]
s1=set(s1)

s2=s2.replace('{', '').replace('}', '').replace("'", '')
s2=[k.strip() for k in s2.split(',')]
s2=set(s2)

print(s1)

{'XXX-YYY'}

print(s2)

{'XXX-YYY', 'XXX-AAA', 'XXX-BBB', 'XXX-ZZZ'}

answered Oct 9, 2020 at 8:39

IoaTzimas

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campy · Accepted Answer · 2020-10-09 08:46:55Z

1

This will create a set:

def string2set(string):
    unwanted = "{}'"
    for char in unwanted:
        string = string.replace(char, "")
    list = string.split(",")
    return set(list)

s1 = "{'XXX-YYY'}"
s2 = "{'XXX-YYY', 'XXX-YYY', 'XXX-YYY', 'XXX-YYY'}"

s1_set = string2set(s1)
s2_set = string2set(s2)

s1_set = {'XXX-YYY'}

s2_set = {'XXX-YYY', ' XXX-YYY', ' XXX-YYY', ' XXX-YYY'}

answered Oct 9, 2020 at 8:46

campy

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