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You don’t see a close method because you are looking at the Storage class. The open method of the Storage class returns an instance of django.core.files.base.File [Source code] which basically wraps the python file object and also has a close method that closes the file (The methods like read, etc. are inherited from FileProxyMixin).
Generally when you open a file you should close it, this is the same with Django, which is also emphasised in the documentation:
Closing files is especially important when accessing file fields in a
loop over a large number of objects. If files are not manually closed
after accessing them, the risk of running out of file descriptors may
arise. This may lead to the following error:OSError: [Errno 24] Too many open files
But there are few instances where you shouldn’t close files, which mostly are when you are passing the file to some function / method / object that will read it, for example if you create a FileResponse object you shouldn’t close the file as Django will close it by itself:
The file will be closed automatically, so don’t open it with a context
manager.
To complete your example code, you will close the file as:
from django.core.files.storage import default_storage
file = default_storage.open("dir/file.txt", mode="rb")
data = file.read()
file.close()