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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def generate_imports_for_referenced_namespaces( backend, namespace, insert_type_ignore=False):
 # type: (Backend, ApiNamespace, bool) -> None """ Both the true Python backend and the Python PEP 484 Type Stub backend have to perform the same imports. :param insert_type_ignore: add a MyPy type-ignore comment to the imports in the except: clause. """


    imported_namespaces = namespace.get_imported_namespaces(consider_annotation_types=True)
    if not imported_namespaces:
        return

    type_ignore_comment = TYPE_IGNORE_COMMENT if insert_type_ignore else ""

    backend.emit('try:')
    with backend.indent():
        backend.emit('from . import (')
        with backend.indent():
            for ns in imported_namespaces:
                backend.emit(fmt_namespace(ns.name) + ',')
        backend.emit(')')
    backend.emit('except (ImportError, SystemError, ValueError):')
    # Fallback if imported from outside a package.
    with backend.indent():
        for ns in imported_namespaces:
            backend.emit('import {namespace_name}{type_ignore_comment}'.format(
                namespace_name=fmt_namespace(ns.name),
                type_ignore_comment=type_ignore_comment
            ))
    backend.emit()