Django Python roop

[hito koto]

Hello, all

I want to change to while statement from for statement, so how can i do to?

this is my correct for statement codes:

def fff(x):
    y = []
    for i in range(len(x)):
        y.append(x[i])
    return y

and i want change to while statement

So, this code have erroes:
TypeError: list indices must be integers, not list
def fff(x):
    y = []
    while x !=[]:
       for i in x:
           y.append(x[i])
    return y

[Ilya Kazakevich]

Hello,

What are you trying to do? Split string? Copy array? You probably need to use builtin functions for that.


Ilya Kazakevich,
JetBrains PyCharm (Best Python/Django IDE)
http://www.jetbrains.com/pycharm/
"Develop with pleasure!"

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[hito koto]

MemoryError , Why? idon't know.
I try this have Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 5, in foo
MemoryError errors: 

I'm change to this code: have the Memory Error,

def foo(x):

    y = []
    while x != []:

        for i in range(len(x)):
            y.append(x[i])
    return y

2014年6月11日水曜日 20時21分42秒 UTC+9 hito koto:

[moqia...@gmail.com]

Hi, hito koto:

I think  the problems you asked should be post in python-lang mail-list.

For python program,  I prefer "for", not "while";  It's more simpler.

But  if you like while, I think the following code maybe helpful:

 

def fff(x):

y = []

i = 0

xlen = len(x)

while i< xlen:

y.append(x[i])

i += 1

return y

 

but I more like the follow writing:

def fff(x):

return x[:]

 

or you just do as following:

y  = x[:]

 

python is a power & beautiful language,  

please read the  https://docs.python.org/2/tutorial/ at first like  François said.

 

With Regards.

 

---

moqia...@gmail.com

--

[hito koto]

hi, Ilya Kazakevich:

I would like to change the while statement from the for statement

2014年6月11日水曜日 21時49分32秒 UTC+9 hito koto:

[hito koto]

Hi, qiancong:
Thank you,
Do you not use the while statement to Django?


2014年6月11日水曜日 21時52分54秒 UTC+9 Qiancong:



[moqia...@gmail.com]

In your function, if x is not a empty list,  then while will be a infinite loop, x always not be  [];

then the inner for-loop  will append many many items into y list, Then your computer will say "have the Memory Error",  to tell you the memory not enought.

 

 

---

moqia...@gmail.com

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[Erik Cederstrand]

Den 11/06/2014 kl. 14.49 skrev hito koto <hitoko...@gmail.com>:

> MemoryError , Why? idon't know.
> I try this have Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "<stdin>", line 5, in foo
> MemoryError errors:
>
> I'm change to this code: have the Memory Error,
>
> def foo(x):
> y = []
> while x != []:
> for i in range(len(x)):
> y.append(x[i])
> return y

Your function doesn't modify "x", so "x != []" is always true. You created an endless loop which appends "y" until memory is exhausted. Hence the MemoryError.

These aren't Django-specific questions anymore, so you should head over to a Python mailing list to get further help with basic Python programming.

Erik

[moqia...@gmail.com]

Sometimes, I have to use while statement too. But any time, I think

write right code, write clean code,  It's a basic rule for our develope work.

 

---

moqia...@gmail.com

 

From: hito koto

Date: 2014-06-11 21:05

To: django-users

Subject: Re: Django Python roop

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[Javier Guerra Giraldez]

On Wed, Jun 11, 2014 at 8:12 AM, moqia...@gmail.com
<moqia...@gmail.com> wrote:
> write right code, write clean code, It's a basic rule for our develope
> work.

for that you have to learn what the code means. "while x !=[]:" will
always be an endless loop. the "[]" doesn't do what you think.

--
Javier

[hito koto]

Ok, thank you!

2014年6月11日水曜日 21時52分54秒 UTC+9 Qiancong: