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j={"id":"1","children":[{"id":"2","children": [{"id":"3","name":"3"}],"name":"2"},{"id":"4","name":"4"}],"name":"1"} 
 
def searchDict(obj, id):
    if obj['id']==id:
        print obj #{"id":"3","name":"3"}
        return obj.copy()
    else:
        if 'children' in obj:
            for child in obj['children']:
                searchDict(child, id)
 
jj = searchDict(j, "3")
print jj #  ----> None ?

bonjour comment recupérer {"id":"3","name":"3"} svp?