copy an iterable class object

[badech]

Hello every ody and happy new year
i need some help
i want to write a function which copies a list
here is the code

def copieIterative(l):
    global l1,der,lcopie
    l1=l
    lcopie=None
    if l1!=None :
        lcopie=ajoute_Tete(lcopie,l1.val)
        der=lcopie
        l1=l1.suiv
        while l1 != None :
            der=ajoute_Tete(der,l1.val)
            der=der.suiv
            l1=l1.suiv
    return lcopie

but it doesn't work :(
it returns this

>>> l=None
>>> for i in range(7) :
	l=ajoute_Tete(l,randrange(12,68767,5))
>>> [B]l
7122 32857 38922 23662 20242 26207 8617 [/B] 
>>> lcopie=None
>>> der=None
>>> l1=None
>>> v=copieIterative(l)
>>> [B]v
7122           <----- the problem is here , it doesn't copie the whole list , just the first element[/B]

any suggestion ?
thanks a lot

PS:i have these two functions :

class Noeud:
    def __init__(self,valeur,suivant=None):
        self.val = valeur
        self.suiv = suivant
    def __repr__(self):
        res = str(self.val)+" "
        if (self.suiv != None):
            res = res + str(self.suiv)
        return res
    def __lt__(self, autre):
        return self.val < autre.val

def ajoute_Tete(L, x):
    return Noeud(x, L)

[bvdet]

'l' is an instance. To copy the list displayed by print:

>>> print l
19337 68037 36652 59487 28882 22032 50767 10717 30877 64142 
>>> print type(l)
<type 'instance'>
>>> copiedList = repr(l).split()
>>> print "Copied List: %s" % (copiedList)
Copied List: ['19337', '68037', '36652', '59487', '28882', '22032', '50767', '10717', '30877', '64142']
>>> print type(copiedList)
<type 'list'>
>>> print map(int, copiedList)
[19337, 68037, 36652, 59487, 28882, 22032, 50767, 10717, 30877, 64142]
>>> print type(map(int, copiedList)[0])
<type 'int'>

[bvdet]

I have one more suggestion. Do not use 'l' (lower case 'L') in variable names unless it is obvious as in 'lucky_number'. Many times it is difficult to distinguish between 'l' and '1', depending on the font. Following is a function that will return a list of integers from your instance 'l' (substituting 'a' for 'l'):

def copyinstList(a):
    b = repr(a).split()
    return map(int, b)

HTH

[badech]

thank you for your answers but i must write this function by myself ( i musn't use the predefinied functions ) (it's an exercise )
thanks

[bvdet]

thank you for your answers but i must write this function by myself ( i musn't use the predefinied functions ) (it's an exercise )
thanks

This may give you some ideas:

from random import randrange

class Noeud(object):
    
    def __init__(self, valeur, suivant=None):
        self.val = valeur
        self.suiv = suivant
        self.listUpdate()

    def __repr__(self):
        res = str(self.val)+" "
        if (self.suiv != None):
            res += str(self.suiv)
        return res
    
    def __lt__(self, autre):
        return self.val < autre.val
    
    def listUpdate(self):
        if self.suiv == None:
            self.list = [self.val, ]
        else:
            self.list = [self.val, ] + self.suiv.list
                        
def ajoute_Tete(L, x):
    return Noeud(x, L)

a = None
for i in range(10) :
    a = ajoute_Tete(a,randrange(12,68767,5))

def copieIterative(z):
    return z.list
    
v = copieIterative(a)

>>> print a
35667 8742 52832 7697 66512 33497 56017 31472 18857 14202 

>>> print v
[35667, 8742, 52832, 7697, 66512, 33497, 56017, 31472, 18857, 14202]

Your code returns an instance with one element in the string. I do not know what your assignment rules are, so I added a class method to accumulate a list that you can readily access.

[badech]

thank you for your answer , i'll see after ( it's now 3:07 so ...)
thanks........

[bartonc]

This may give you some ideas:

from random import randrange

class Noeud(object):
    
    def __init__(self, valeur, suivant=None):
        self.val = valeur
        self.suiv = suivant
        self.listUpdate()

    def __repr__(self):
        res = str(self.val)+" "
        if (self.suiv != None):
            res += str(self.suiv)
        return res
    
    def __lt__(self, autre):
        return self.val < autre.val
    
    def listUpdate(self):
        if self.suiv == None:
            self.list = [self.val, ]
        else:
            self.list = [self.val, ] + self.suiv.list
                        
def ajoute_Tete(L, x):
    return Noeud(x, L)

a = None
for i in range(10) :
    a = ajoute_Tete(a,randrange(12,68767,5))

def copieIterative(z):
    return z.list
    
v = copieIterative(a)

>>> print a
35667 8742 52832 7697 66512 33497 56017 31472 18857 14202 

>>> print v
[35667, 8742, 52832, 7697, 66512, 33497, 56017, 31472, 18857, 14202]

Your code returns an instance with one element in the string. I do not know what your assignment rules are, so I added a class method to accumulate a list that you can readily access.

Bilingual coding... I'm impressed. I confess that I need english identifiers in order to have a clue about somebody else's code. You are indeed worthy of your new title and that of "expert".

[badech]

hello
finally i secceded to write the function here is the code :

def copieIterative2(L):
    L1=L
    lcopie=None
    while L1!=None :
        lcopie=ajoute_Tete(lcopie,L1.val)
        L1=L1.suiv
    return lcopie

which works but it returns the list reversed
can you tell me why it reverse the list please ?
thank you

[badech]

no answer ? :(
please help me

[bvdet]

hello
finally i secceded to write the function here is the code :

def copieIterative2(L):
    L1=L
    lcopie=None
    while L1!=None :
        lcopie=ajoute_Tete(lcopie,L1.val)
        L1=L1.suiv
    return lcopie

which works but it returns the list reversed
can you tell me why it reverse the list please ?
thank you

You are passing the integer arguments to your function in reverse order. The first argument 'L1.val' in 'copieIterative 2()' was the last argument passed in the instance you are trying to copy. Adding another iteration may work. Accumulate a list of integers, execute a 'for i in int_list:' and the instance can be recreated in the correct order.

[bvdet]

Bilingual coding... I'm impressed. I confess that I need english identifiers in order to have a clue about somebody else's code. You are indeed worthy of your new title and that of "expert".

Thanks Barton! English variable names and a few comments would have helped. I was a little confused but fortunately the exercise was not too difficult.

[badech]

question solved by bvdet
thank you bvdet
i'll post the answer later
thank you :)