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this example works well for me, i am posting it even if it seems the same as yours:

number_counter_node = Node(
        package="my_pkg",
        executable="number_counter",
        name="my_number_counter",
        remappings=[
            ("number_count", "my_number_count")
        ]
    )

this example works well for me, i am posting it even if it seems the same as yours:

Edit: have you tried adding commas after each line like in my example ?

number_counter_node = Node(
        package="my_pkg",
        executable="number_counter",
        name="my_number_counter",
        remappings=[
            ("number_count", "my_number_count")
        ]
    )