Is there support for modifying the address of a linked image?

[ThomasRuf]

I need to change from time to time the address of linked images in my powerpoint presentation. I can read the address by finding the shape which containes a linked picture and ...
rels = str(shape.part.rels.xml, 'utf-8')
link = rels.split('image" Target="')[1].split('" TargetMode="External"')[0]
print(link)

but I can't modify the xml code.

Thanks for any advice, Thomas

[scanny]

@ThomasRuf it looks like you're serializing the relationships for some reason (using shape.part.rels.xml).

If you instead iterate over the _Relationship objects themselves you'll find existing read/write attributes for what you're looking for.

These are not modified by the user during the normal course of using the library, so they're not described in the documentation, but the code is here: https://github.com/scanny/python-pptx/blob/master/src/pptx/opc/package.py#L680 and the docstrings should be enough to sort out what you need.

Something like:

from typing import Iterator
from pptx.opc.package import _Relationship

external_rels = (r for r in slide.part.rels if r.is_external)

for rel in external_rels:
    rel._target = "http://github.com"

[ThomasRuf]

Thanks a lot for the fast answer, very much appreciated. Just for the records, the above code didn't worked out of the box for me. The following did:

for v in slide.part.rels.values():
if v.is_external:
print('external:',v.rId,v._target)