Output formatter corrupts original data

[MaxKh]

version: 3.5.0
python 3.11

I'm trying to export the same dataset several times in different file formats. I've found that specifying a formatter for a column data alters the underlying data. The issue occurs if exporting the same format too.

import tablib

dataset = tablib.Dataset()
dataset.headers = ["text"]
dataset.append(["aAbBcC"])
dataset.add_formatter("text", lambda s: s[2:])

print(dataset.export("csv"))
print(dataset.export("csv"))

Output:

text
bBcC

text
cC

[claudep]

Thanks for the report! Do you want to test the above pull request?

[MaxKh]

I'll wait for a new release. Thanks

[hugovk]

If you can test it, it would help us know if it really fixes it, means we can release sooner, and potentially avoid re-fixing later.