python add static string to all items in set

Question

I have the following set in python (its actually one set item):

  product_set = {'Product, Product_Source_System, Product_Number'}

I want to add a static prefix (source.) to all the comma seperated values in the set, so I get the following output:

 {'source.Product, source.Product_Source_System, source.Product_Number'}

I tried with a set comprehension, but it doesn't do the trick or I'm doing something wrong. It only prefixes the first value in the set.

{"source." + x for x in set}

I know sets are immutable. I don't need a new set, just output the new values.

Anyone that can help?

Thanks in advance

Can't reproduce. The prefix is added to all elements, as expected. (Also don't call your sets set - it hides the set builtin.) — user2357112
– user2357112, Commented Aug 12, 2022 at 12:07
Ahhh my bad, it appears I have quite a weird set, with one big comma seperated value. I've changed my starting post — JVGBI
– JVGBI, Commented Aug 12, 2022 at 12:14

Robert Haas · Accepted Answer · 2022-08-12 12:17:12Z

3

Edit: Splitting the initial long string into a list of short strings and then (only if required) making a set out of the list:

s1 = set('Product, Product_Source_System, Product_Number'.split(', '))

Constructing a new set:

s1 = {'Product', 'Product_Source_System', 'Product_Number'}
s2 = {"source." + x for x in s1}

Only printing the new strings:

for x in s1:
    print("source." + x)

edited Aug 12, 2022 at 12:17

answered Aug 12, 2022 at 12:14

Robert Haas

1,0134 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

JVGBI Over a year ago

Thx for the swift response, I've made a mistake in the starting post and I've edited it.

Robert Haas Over a year ago

I've updated the initial response

JvdV · Accepted Answer · 2022-08-12 12:28:13Z

2

Note: The shown desired result is a new set with updated comma-seperated values. Further down you mentioned: "I don't need a new set, just output the new values". Which one is it? Below an option to mimic your desired result:

import re

set =  {'Product, Product_Source_System, Product_Number'}
set = {re.sub(r'^|(,\s*)', r'\1source.', list(set)[0])}
# set = {'source.'+ list(set)[0].replace(', ', ', source.')}
print(set)

Prints:

{'source.Product, source.Product_Source_System, source.Product_Number'}

edited Aug 12, 2022 at 12:28

answered Aug 12, 2022 at 12:20

JvdV

76.8k8 gold badges48 silver badges89 bronze badges

3 Comments

JVGBI Over a year ago

either works for me, but your solution returns an error unfortunately. Thanks for the help though

JvdV Over a year ago

@JVGBI, please note the greyed out option without Regex.

JVGBI Over a year ago

Works like a flaw, thank you so much! :)

Collectives™ on Stack Overflow

python add static string to all items in set

2 Answers 2

2 Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related