How to get relative paths with Pathlib

Question

I started using from pathlib import Path in place of os.path.join() to concatenate my paths. Taking the following code into consideration:

from pathlib import Path
import cv2

rootfolder = "rootyrooty"
file = "alittlefile"
image_path = Path(rootfolder, file)
image = cv2.imread(image_path.as_posix())

I'm using image_path.as_posix() to get a full string so I can pass image_path into imread function. Directly typing image_path doesn't works since it returns WindowsPath('rootyrooty/alittlefile') but I need "rootyrooty/alittlefile" (Since imread accepts strings instead of windowsPath objects). Do I have to use another component from pathlib instead of Path so I can just feed image_path into imread function. Like:

from pathlib import thefunctionyetidontknow
image_path = thefunctionyetidontknow("rootyrooty","alittlefile")
print("image_path")
# returns "rootyrooty/alittlefile"

Thanks.

Lesiak · Accepted Answer · 2020-05-05 20:46:02Z

The way you are combining paths is perfectly fine. What is questionable is the usage of as_posix() on a Windows machine. Some libs that accept a string as a path may be fine with posix path separators, but it may be preferable to use the os separator instead. To get path with filesystem separators, use str.

See https://docs.python.org/3/library/pathlib.html

The string representation of a path is the raw filesystem path itself (in native form, e.g. with backslashes under Windows), which you can pass to any function taking a file path as a string:
>> p = PurePath('/etc')
>> str(p)
'/etc'
>> p = PureWindowsPath('c:/Program Files')
>> str(p)
'c:\\Program Files'

jkr · Accepted Answer · 2020-05-05 20:18:46Z

1

You can convert the Path object to a string with Python's builtin str function:

from pathlib import Path
import cv2

rootfolder = "rootyrooty"
file = "alittlefile"
image_path = Path(rootfolder, file)
image = cv2.imread(str(image_path))

answered May 5, 2020 at 20:18

jkr

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