Project CRS Setting Invalid

Question

Somehow, my attempt at setting the QGIS project coordinate reference system to a Sinusoidal projection by defining the CRS' EPSG ID returns Invalid CRS!.
crs = 54008 # World Sinusoidal Projection

# Set project coordinate reference system (CRS)
spatRef = QgsCoordinateReferenceSystem(crs, QgsCoordinateReferenceSystem.EpsgCrsId)

if spatRef.isValid():
    print("CRS Description: {}".format(spatRef.description()))
    print("CRS PROJ text: {}".format(spatRef.toProj4()))
    QgsProject.instance().setCrs(spatRef)
else:
    print("Invalid CRS!")

I use the long-term QGIS version 3.10.3 on Windows.

Ian Turton · Answer

From a quick look at the documentation it appears that your crs code should be EPSG:54008.

However, looking at http://epsg.io/54008 - indicates that it is an ESRI code not EPSG so you may need to use

crs = "proj:+proj=sinu +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs"

Project CRS Setting Invalid

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