Is there a way to make Set Anchors command + U thought the Macro Panel, I can’t find a method in GSLayer Class Reference
I am trying to do something like this:
for layer in Glyphs.font.selectedLayers:
layer.setAnchors_(Auto) # I need help here
if layer.anchors:
print [anchor.name for anchor in layer.anchors]
layer.setAnchors_(Auto)
is the equivalent of
layer.anchors = Auto
that is not what you intended. This is how (as written in docu.glyphsapp.com.
layer.addMissingAnchors()Is there a quick script to add eg. bottom anchors to all selected glyphs on all layers? Should be easy, right? 
All layers must also include all Brace and Bracket layers. Here is one that just puts one in all layers it can find.
thisFont = Glyphs.font
# iterate through all layers of all selected glyphs:
for thisGlyph in [l.parent for l in thisFont.selectedLayers]:
for thisLayer in thisGlyph.layers:
# check if bottom anchor is missing:
if not thisLayer.anchorForName_("bottom"):
# add anchor:
bottomAnchor = GSAnchor.alloc().init()
bottomAnchor.name = "bottom"
thisLayer.addAnchor_(bottomAnchor)
# set its position:
halfWidth = thisLayer.width * 0.5
halfWidthOnTheBaseline = NSPoint( halfWidth, 0.0 )
bottomAnchor.setPosition_( halfWidthOnTheBaseline )
It doesn’t do anything if the bottom anchor already exists on that layer.
That’s very helpful, thank you! How can I add the line to move it to half the width, please? Sorry!
Whoops, I must be doing something wrong, I can’t get that script to do anything. Feeling stupid now 
No, I made a mistake in the code sample. It is corrected now. Copy and paste again 
Okay, I adapted the sample for this, and corrected another mistake I had made. Now it should work as intended. Do you understand the code?
Um, it seems to add bottom anchors to all glyphs, not just the selected one. Think I might cry
Yes, of course. I updated the script sample above again.
What about your own Python skills? The level of understanding it takes to write (or fix) such a script yourself is easy to reach.
Phew, no crying needed
Thanks, Erich, that’s very good. I need to do some Python workshop at next opportunity, I don’t get it at all.
There is a workshop coming up in Frankfurt, probably early next year.
And there is a three-part introductory tutorial in the Tutorials section. That one is pretty easy and known to have gotten a bunch of type designers started in Python. Just to whet your appetite. 
Frankfurt, who’s teaching it?
Will have a look at the intro tutorial, thanks. I have yet to find something that suits my learning style. Thanks!
Some other resources for learning Python, some free:
https://developers.google.com/edu/python/?csw=1
http://learnpythonthehardway.org/book/
https://www.codecademy.com/en/tracks/python
Yours truly.
Keep me posted about Frankfurt
George, thank you. I’d tried Codecademy and hated it, will have a look at the others when not under deadline pressure!
@mekkablue If it’s not too complicated, would you be able to give an example of how to set an anchor at a particular position in a particular master? E.g. x, y coordinates in the regular master?
anchor = GSAnchor("top", (400, 20))
layer.anchors.append(anchor)
to get to the layer:
master = Font.masters[1]
glyph = Font.glyphs["A"]
layer = glyph.layers[master.id]
or
layer = Font.selectedLayers[0]
or for all selected layers
for layer in Font.selectedLayers:
...
Thanks, Georg. I should get to the layer first, right, before trying to add an anchor?
What I’m hoping to do is to select a bunch of marks of a particular type and add identical anchors to all of them, at set coordinates in each master. I’ll see how this goes.
There seems to be a problem with the wrapper so it need to be like this:
anchorName = "top"
anchorPosition = (123, 456)
for layer in Font.selectedLayers:
anchor = GSAnchor.alloc().init()
anchor.name = anchorName
anchor.position = anchorPosition
layer.anchors.append(anchor)