How to fix "plural forms expression could be dangerous"

[Martin Brochhaus]

Hi everyone,

in my project, I am generating my .po files like this:

python manage.py makemessages --ignore=node_modules/* --ignore=*migrations/* --ignore=*tests/* --ignore=__init__.py --ignore=submodules/* --ignore=fabfile* -l zh_CN

Usually this results in the following line being added to my `django.po` file:

"Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;\n"

When this line is in the file and when I switch the language to Chinese, I will get this error:

ValueError at /zh-cn/

plural forms expression could be dangerous

When I delete that line and run `./manage.py compilemessages`, everything seems to work fine, but this is obviously can't be a good solution and would mess up my deployment workflow quite a bit.

So my question is: Why does this line pop up in my .po file? What if I change that expression to something valid, would it be overwritten with that same faulty expression again when I run makemessages? What would a correct expression look like for Chinese?

Best regards,

Martin

[Tom Evans]

You need to change INTEGER and EXPRESSION for the correct values. I
believe for zh you want "nplurals=1; plural=0;"

Cheers

Tom

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[Martin Brochhaus]

Thanks for the reply, Tom.

Inserting those values does indeed make the error go away, but I am still left with the issue that on each deployment, when I run `./manage.py makemessages`, it overwrites that line with the faulty one and my site is left in a broken state.

Anyone knows how to prevent this line from being overwritten all the time?