'How to write a long os.path.join chain while complying to PEP8

I am using a long chain of os.path.join() to generate a path (it ensures the path will work on any OS).

"metadata": os.path.join(BASE_DIR, os.path.join('ServiceProvider',os.path.join('config', os.path.join('metadata',os.path.join('gmail_metadata.xml'))))),

I would like to break it down into multiple lines the PEP8 way but I can't seem to make this happen.

I tried several things:

"metadata": os.path.join(BASE_DIR, 
            os.path.join('ServiceProvider',
            os.path.join('config', 
            os.path.join('metadata',
            os.path.join('gmail_metadata.xml'))))),

will get me the PEP8 error continuation line under-indented for visual indentpep8(E128)

and

"metadata": os.path.join(BASE_DIR, os.path.join('ServiceProvider',
                                                    os.path.join('config', os.path.join('metadata',
                                                                                        os.path.join('gmail_metadata.xml'))))),

which is actually what PEP8 autofix did, I'm getting the line too long error.

If it is not possible to fix the PEP8 errors in this case I would still like to know how you would do it !

python pep8

Solution 1:^[1]

The pathlib module will allow you to chain things in an interesting and flexible way. Lovely tutorial here

import pathlib

# use / operator
path = pathlib.Path("BASE_DIR")
path /= "ServiceProvider" / "config" / "metadata" / "gmail_metadata.xml"
# or
path = pathlib.Path("BASE_DIR") / "ServiceProvider" / "config" / "metadata" / "gmail_metadata.xml"
# or
path = pathlib.Path("BASE_DIR") / 
       "ServiceProvider" / 
       "config" / 
       "metadata" / 
       "gmail_metadata.xml"

If you want to use joinpath from os.path module or pathlib then you doint have to nest the joins, one is enough.

path = os.path.join(*[BASE_DIR, "ServiceProvider", "config", "metadata", "gmail_metadata.xml"])
# or
path = pathlib.Path("BASE_DIR").joinpath(*["ServiceProvider", "config", "metadata", "gmail_metadata.xml"])

Sources

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'How to write a long os.path.join chain while complying to PEP8

Solution 1:[1]

Sources

Related Questions

Solution 1:^[1]