[QGIS-Developer] PyQGIS: Check if layer is already loaded?

Magnus Homann magnus at homann.se
Sun Jun 4 07:42:02 PDT 2017

I'm writing a plugin that adds feature to a SHP-layer, specified as a filename.
If the layer already is loaded in Qgis, I want to check for and use the loaded
layer instead of creating a new from the same SHP-file.

Is this even possible?

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