Feature Request: Change the location of the local cache to the users home directory.

[draperjames]

Running tldextract 2.2.0 on Python 3.6.5 on Windows 10.

Currently when I run:
tldextract.extract("https://example.com")
It runs just fine but I get the following error:
unable to cache TLDs in file C:\Program Files\Miniconda3\lib\site-packages\tldextract\.tld_set: [Errno 13] Permission denied: 'C:\\Program Files\\Miniconda3\\lib\\site-packages\\tldextract\\.tld_set'
There are multiple ways to approach this but I believe the best is writing the cache somewhere in the users home directory. Similar to the way IPython and Matplotlib do it. That way the user wouldn't have to change the permissions of the specific site package.

[floer32]

@draperjames it's trivial to tell tldextract where to save the cache, actually!

two options:

1. you can set the environment variable, TLDEXTRACT_CACHE. this will affect the singleton instance that you are using in your example above. https://github.com/john-kurkowski/tldextract/blob/master/tldextract/tldextract.py#L94
2. or, instantiate your own TLDExtract. it takes keyword arguments and one of these is cache_file https://github.com/john-kurkowski/tldextract/blob/master/tldextract/tldextract.py#L162

[floer32]

sorry for the noise, fat fingered some things

[floer32]

oh right this is covered in the docs - so we won't need to update docs in relation to this issue

https://github.com/john-kurkowski/tldextract#note-about-caching

[floer32]

Lastly: hey, it's understandable that you'd want the defaults, with no arguments, to behave that way, plenty of things default to $HOME. however there are also other cases where people want to control their own permissions about HOME vs other things. the current behavior seems to be sane for the vast majority of users, so for now this does not need to change. just set TLDEXTRACT_CACHE as you please 🙂

[john-kurkowski]

Related: #9

[john-kurkowski]

Arguably came up again: #196