def cons(head_ele,l,**kwargs):
    '''
        from elist.elist import *
        ol=[1,2,3,4]
        id(ol)
        new = cons(5,ol)
        new
        id(new)
        ####
        ol=[1,2,3,4]
        id(ol)
        rslt = cons(5,ol,mode="original")
        rslt
        id(rslt)
    '''
    if('mode' in kwargs):
        mode = kwargs['mode']
    else:
        mode = "new"
    return(prepend(l,head_ele,mode=mode))
def cons(head_ele,l,**kwargs):
    '''
        from elist.elist import *
        ol=[1,2,3,4]
        id(ol)
        new = cons(5,ol)
        new
        id(new)
        ####
        ol=[1,2,3,4]
        id(ol)
        rslt = cons(5,ol,mode="original")
        rslt
        id(rslt)
    '''
    if('mode' in kwargs):
        mode = kwargs['mode']
    else:
        mode = "new"
    return(prepend(l,head_ele,mode=mode))
def cons ( head_ele , l , * * kwargs ) : if ( 'mode' in kwargs ) : mode = kwargs [ 'mode' ] else : mode = "new" return ( prepend ( l , head_ele , mode = mode ) )
from elist.elist import *
        ol=[1,2,3,4]
        id(ol)
        new = cons(5,ol)
        new
        id(new)
        ####
        ol=[1,2,3,4]
        id(ol)
        rslt = cons(5,ol,mode="original")
        rslt
        id(rslt)
from elist . elist import * ol = [ 1 2 3 4 ] id ( ol ) new = cons ( 5 ol ) new id ( new ) #### ol = [ 1 2 3 4 ] id ( ol ) rslt = cons ( 5 ol mode = original ) rslt id ( rslt )