How do I change webmaps used in a web mapping application?

SteveLi

web_mapping_app_item.get_data() will give me a json object, which has a map property:

'map': {'3D': False,   '2D': True,   'position': {'left': 0, 'top': 40, 'right': 0, 'bottom': 0},   'itemId': 'xyz',   'mapOptions': {}},


I need to update the map's itemId property of the web mapping application, how do I do that? 

SteveLi

Thanks for providing samples.

It's still not clear to me how to do it.  The item I need update is a web mapping application, not webmap.  The update on an item can only take following keys.  which key should I use?

Key	Value
type	Optional string. Indicates type of item, see URL 1 below for valid values.
typeKeywords	Optional string. Provide a lists all sub-types, see URL 1 below for valid values.
description	Optional string. Description of the item.
title	Optional string. Name label of the item.
url	Optional string. URL to item that are based on URLs.
tags	Optional string. Tags listed as comma-separated values, or a list of strings. Used for searches on items.
text	Optional string. For text based items such as Feature Collections & WebMaps
snippet	Optional string. Provide a short summary (limit to max 250 characters) of the what the item is.
extent	Optional string. Provide comma-separated values for min x, min y, max x, max y.
spatialReference	Optional string. Coordinate system that the item is in.
accessInformation	Optional string. Information on the source of the content.
licenseInfo	Optional string. Any license information or restrictions regarding the content.
culture	Optional string. Locale, country and language information.
access	Optional string. Valid values are private, shared, org, or public.
commentsEnabled	Optional boolean. Default is true, controls whether comments are allowed (true) or not allowed (false).