What is the work of instance & filename which is passing as parameter?

[Tanjina Sharmin]

def path_and_renamecsv(instance, filename):
upload_to = 'attendancesheet'
ext = filename.split('.')[-1]
# get filename
if instance.pk:
filename = '{}.{}'.format(instance.pk, ext)
else:
# set filename as random string
filename = '{}.{}'.format(uuid4().hexq, ext)
# return the whole path to the file
return os.path.join(upload_to, filename)

[Kasper Laudrup]

Not sure what you mean by "work of", but Python is a dynamically typed
language so you can really pass whatever type you want to the function.

This line:

> ext = filename.split('.')[-1]

looks like the filename parameter is most likely expected to be a string
and this line:

> if instance.pk:

indicates that instance is something that is expected to have a pk
member in some (most?) cases.

What exactly is this function and where did you get it from?

I'm assuming you didn't write it yourself.

A bit more context would make it a lot easier for someone to help you.

Kind regards,

Kasper Laudrup

[Sky Lord]

So right here what does the filename changes to?

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[Hella thor]

For Chinese programmers,it's money

Tanjina Sharmin <tanjinash...@gmail.com> 于2021年9月3日周五 下午8:25写道：