def prextend(ol,nl,**kwargs):
    '''
        from elist.elist import *
        ol = [1,2,3,4]
        nl = [5,6,7,8]
        id(ol)
        id(nl)
        prextend(ol,nl,mode="original")
        ol
        id(ol)
        ####
        ol = [1,2,3,4]
        nl = [5,6,7,8]
        id(ol)
        id(nl)
        new = prextend(ol,nl)
        new
        id(new)
    '''
    if('mode' in kwargs):
        mode = kwargs["mode"]
    else:
        mode = "new"
    if(mode == "new"):
        new = copy.deepcopy(nl)
        cpol = copy.deepcopy(ol)
        new.extend(cpol)
        return(new)
    else:
        length = ol.__len__()
        nl_len = nl.__len__()
        for i in range(0,nl_len):
            ol.append(None)
        for i in range(length-1,-1,-1):
            ol[i+nl_len] = ol[i]
        for i in range(0,nl_len):
            ol[i] = nl[i]
        return(ol)
def prextend(ol,nl,**kwargs):
    '''
        from elist.elist import *
        ol = [1,2,3,4]
        nl = [5,6,7,8]
        id(ol)
        id(nl)
        prextend(ol,nl,mode="original")
        ol
        id(ol)
        ####
        ol = [1,2,3,4]
        nl = [5,6,7,8]
        id(ol)
        id(nl)
        new = prextend(ol,nl)
        new
        id(new)
    '''
    if('mode' in kwargs):
        mode = kwargs["mode"]
    else:
        mode = "new"
    if(mode == "new"):
        new = copy.deepcopy(nl)
        cpol = copy.deepcopy(ol)
        new.extend(cpol)
        return(new)
    else:
        length = ol.__len__()
        nl_len = nl.__len__()
        for i in range(0,nl_len):
            ol.append(None)
        for i in range(length-1,-1,-1):
            ol[i+nl_len] = ol[i]
        for i in range(0,nl_len):
            ol[i] = nl[i]
        return(ol)
def prextend ( ol , nl , * * kwargs ) : if ( 'mode' in kwargs ) : mode = kwargs [ "mode" ] else : mode = "new" if ( mode == "new" ) : new = copy . deepcopy ( nl ) cpol = copy . deepcopy ( ol ) new . extend ( cpol ) return ( new ) else : length = ol . __len__ ( ) nl_len = nl . __len__ ( ) for i in range ( 0 , nl_len ) : ol . append ( None ) for i in range ( length - 1 , - 1 , - 1 ) : ol [ i + nl_len ] = ol [ i ] for i in range ( 0 , nl_len ) : ol [ i ] = nl [ i ] return ( ol )
from elist.elist import *
        ol = [1,2,3,4]
        nl = [5,6,7,8]
        id(ol)
        id(nl)
        prextend(ol,nl,mode="original")
        ol
        id(ol)
        ####
        ol = [1,2,3,4]
        nl = [5,6,7,8]
        id(ol)
        id(nl)
        new = prextend(ol,nl)
        new
        id(new)
from elist . elist import * ol = [ 1 2 3 4 ] nl = [ 5 6 7 8 ] id ( ol ) id ( nl ) prextend ( ol nl mode = original ) ol id ( ol ) #### ol = [ 1 2 3 4 ] nl = [ 5 6 7 8 ] id ( ol ) id ( nl ) new = prextend ( ol nl ) new id ( new )