Conexão com banco utilizando o Pyqgis

[Luciana Estevam]

Alguém poderia me ajudar, estou tentando fazer conexão com banco de dados usando o pyqgis e esta dando erro nas duas últimas linhas 

-- from PyQt5.QtCore import *

from PyQt5.QtGui import *

from qgis.core import *

from qgis.gui import *

def run_script ( iface ):

    uri = QgsDataSourceUri ()

    uri.setConnection ("host", "5432", "leitura", "senha")

    uri.setDataSource ("geo", "area_autorizada", "geom", "cod_projeto = 63")

    layer = QgsVectorLayer (uri.uri (), "reefs" , "postgres")

    if not layer.isValid ():

    print "layer%s did not load"% Layer.name ()

    QgsProject.instance().addMapLayer([layer]) ----

Erro:

Traceback (most recent call last):

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\code.py", line 63, in runsource

    code = self.compile(source, filename, symbol)

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 168, in __call__

    return _maybe_compile(self.compiler, source, filename, symbol)

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 99, in _maybe_compile

    raise err1

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 87, in _maybe_compile

    code1 = compiler(source + "\n", filename, symbol)

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 133, in __call__

    codeob = compile(source, filename, symbol, self.flags, 1)

  File "<input>", line 7

    print "layer%s did not load"% Layer.name ()

                                              ^

IndentationError: expected an indented block

    QgsProject.instance().addMapLayer([layer])

Traceback (most recent call last):

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\code.py", line 63, in runsource

    code = self.compile(source, filename, symbol)

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 168, in __call__

    return _maybe_compile(self.compiler, source, filename, symbol)

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 99, in _maybe_compile

    raise err1

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 87, in _maybe_compile

    code1 = compiler(source + "\n", filename, symbol)

  File "C:\PROGRA~1\QGIS3~1.8\apps\Python37\lib\codeop.py", line 133, in __call__

    codeob = compile(source, filename, symbol, self.flags, 1)

  File "<input>", line 1

    QgsProject.instance().addMapLayer([layer])

    ^

IndentationError: unexpected indent