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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 create_analysis_layer(analysis_extent, crs, name):
 """Create the analysis layer. :param analysis_extent: The analysis extent. :type analysis_extent: QgsGeometry :param crs: The CRS to use. :type crs: QgsCoordinateReferenceSystem :param name: The name of the analysis. :type name: basestring :returns: A polygon layer with exposure's crs. :rtype: QgsVectorLayer """

    fields = [
        create_field_from_definition(analysis_name_field)
    ]
    analysis_layer = create_memory_layer(
        'analysis', QgsWkbTypes.PolygonGeometry, crs, fields)

    analysis_layer.startEditing()

    feature = QgsFeature()
    # noinspection PyCallByClass,PyArgumentList,PyTypeChecker
    feature.setGeometry(analysis_extent)
    feature.setAttributes([name])
    analysis_layer.addFeature(feature)
    analysis_layer.commitChanges()

    # Generate analysis keywords
    analysis_layer.keywords['layer_purpose'] = (
        layer_purpose_analysis_impacted['key'])
    analysis_layer.keywords['title'] = 'analysis'
    analysis_layer.keywords[inasafe_keyword_version_key] = (
        inasafe_keyword_version)
    analysis_layer.keywords['inasafe_fields'] = {
        analysis_name_field['key']: analysis_name_field['field_name']
    }

    return analysis_layer