pyqgis - Getting QGIS 2.x python code to work in QGIS 3.x? object has no attribute 'legendInterface' problem

The following piece of code works well in QGIS 2.x, however it does not work in QGIS 3.x.

myDir = 'd:/work/output_folder/'
layers = iface.legendInterface().layers()
pipe = QgsRasterPipe()
for layer in layers:
 extent = layer.extent()
 width, height = layer.width(), layer.height()
 renderer = layer.renderer()
 provider=layer.dataProvider()

 crs = layer.crs().toWkt() 
 pipe.set(provider.clone())
 pipe.set(renderer.clone())
 opts = ["COMPRESS=LZW"] 
 file_writer = QgsRasterFileWriter(myDir + layer.name() + ".tif")
 file_writer.setCreateOptions(opts)
 file_writer.writeRaster(pipe,
      width,
         height,
         extent,

         layer.crs())

This is the error I get when I run the code:

Traceback (most recent call last):
  File "C:\PROGRA~1\QGIS3~1.0\apps\Python36\lib\code.py", line 91, in runcode
    exec(code, self.locals)
  File "", line 1, in 
AttributeError: 'QgisInterface' object has no attribute 'legendInterface'

Does someone know what has replaced 'legendInterface' in the new version or what other changes I might have to make to get this to run in QGIS 3.0?

Answer

You could just replace:

layers = iface.legendInterface().layers()

with

layers = [layer for layer in QgsProject.instance().mapLayers().values()]