A.Maine - 8 months ago 35

Python Question

I've come to an end with my assignment, I don't know where I go from where I am right now, the code is currently looking like this:

`from labb7 import Queue`

import random

def radixsorting1(n,m):

div=1

mod=10

q=Queue()

bin_list=[]

for k in range(0,m):

q.put(random.randint(1,10**n))

for bins in range(0,10):

bin_list.append(q)

while not q.isempty():

value=q.get()

minsta_tal=value%mod

minsta_tal=int(minsta_tal//div)

bin_list[minsta_tal].put(value)

mod=mod*10

div=div*10

for bins in bin_list:

while not bins.isempty():

for x in bins:

r=[]

r.append(x)

return r

What I've been trying to do is to create 10 queues in put them in a list, then random m numbers from 1 to 10^n. Lets say I get 66 and 72, then I first sort them by the "small number", that is 6 and 2 in my numbers, then put them in a lost, and then do the process all over again but for the number 6 and 7 (the bigger number). In its current shape I get the error "Queue" object is not iterable.

My Queue class is looking like this, I think this one is okay.

`class Queue:`

def __init__(self):

self.lista=[]

def put(self,x):

self.lista.append(x)

def get(self):

if not len(self.lista)==0:

return self.lista.pop(0)

def isempty(self):

if self.lista==0:

return True

else:

False

def length(self):

return len(self.lista)

def __iter__(self):

return self

def __next__(self):

if self.lista:

return self.lista.pop(0)

raise StopIteration

Answer

You need to add a bit more code to make it an iterable. `__iter__`

should return an iterator. The iterator should have a `next`

method.

Take a look at this:

So it is my understanding that the thing you want to iterate over is the contents of `self.lista`

... Why not just return `lista`

's iterator.

Here is the easiest way to do that:

```
class Queue:
...
def __iter__(self):
return self.lista.__iter__()
```

It's a bit hard to see what exactly it is that you want.. If what you are trying to do is empty `lista`

as you iterate over it (Queue is a fifo kinda deal) it then rather do this:

```
class Queue:
...
def __iter__(self):
return self
def next(self):
if self.lista: #since empty lists are Falsey
return self.lista.pop(0)
raise StopIteration
```