[Tutor] help
George Nyoro
geonyoro at gmail.com
Mon Oct 10 21:23:11 CEST 2011
On 10/10/2011, tutor-request at python.org <tutor-request at python.org> wrote:
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> Today's Topics:
>
> 1. I am trying to print list elements but i am getting 'none'
> (Praveen Singh)
> 2. Re: I am trying to print list elements but i am getting
> 'none' (Nitin Pawar)
> 3. Re: I am trying to print list elements but i am getting
> 'none' (Christian Witts)
> 4. Re: I am trying to print list elements but i am getting
> 'none' (Steven D'Aprano)
> 5. Re: I am trying to print list elements but i am getting
> 'none' (Wayne Werner)
> 6. Re: I am trying to print list elements but i am getting
> 'none' (Bod Soutar)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 10 Oct 2011 09:26:31 -0400
> From: Praveen Singh <c2praveen30jun at gmail.com>
> To: tutor at python.org
> Subject: [Tutor] I am trying to print list elements but i am getting
> 'none'
> Message-ID:
> <CAJcoizvqvGot=i_o6viURrWjH-FzAsxo456aURVS49sGmEBExw at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> This is my code-
> def getNumbers(num):
> myList=[]
> for numbers in range(0,num,2):
> print myList.append(numbers)
>
>
> output-
>>>> getNumbers(10)
> None
> None
> None
> None
> None
>
> Then i find out that list.append doesn't return anything.Then what should i
> use for this kind of operation.but if i do something like this on idle's
> interpreter it gives me answer-
>>>> myList=[]
>>>> myList.append(8)
>>>> print myList
> [8]
>
> Confused!!!
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>
> ------------------------------
>
> Message: 2
> Date: Mon, 10 Oct 2011 19:00:40 +0530
> From: Nitin Pawar <nitinpawar432 at gmail.com>
> To: Praveen Singh <c2praveen30jun at gmail.com>
> Cc: tutor at python.org
> Subject: Re: [Tutor] I am trying to print list elements but i am
> getting 'none'
> Message-ID:
> <CAORpBsi3nfkYegcUpVcxw4Zp3FQ-kV0uJzpyZHxaj816E4Xj_w at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Try giving the print statement outside the for loop
>
> On Mon, Oct 10, 2011 at 6:56 PM, Praveen Singh
> <c2praveen30jun at gmail.com>wrote:
>
>> This is my code-
>> def getNumbers(num):
>> myList=[]
>> for numbers in range(0,num,2):
>> print myList.append(numbers)
>>
>>
>> output-
>> >>> getNumbers(10)
>> None
>> None
>> None
>> None
>> None
>>
>> Then i find out that list.append doesn't return anything.Then what should
>> i
>> use for this kind of operation.but if i do something like this on idle's
>> interpreter it gives me answer-
>> >>> myList=[]
>> >>> myList.append(8)
>> >>> print myList
>> [8]
>>
>> Confused!!!
>>
>>
>>
>> _______________________________________________
>> Tutor maillist - Tutor at python.org
>> To unsubscribe or change subscription options:
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>>
>>
>
>
> --
> Nitin Pawar
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>
> ------------------------------
>
> Message: 3
> Date: Mon, 10 Oct 2011 15:32:28 +0200
> From: Christian Witts <cwitts at compuscan.co.za>
> To: Praveen Singh <c2praveen30jun at gmail.com>
> Cc: tutor at python.org
> Subject: Re: [Tutor] I am trying to print list elements but i am
> getting 'none'
> Message-ID: <4E92F3EC.8080003 at compuscan.co.za>
> Content-Type: text/plain; charset="windows-1252"; Format="flowed"
>
> On 2011/10/10 03:26 PM, Praveen Singh wrote:
>> This is my code-
>> def getNumbers(num):
>> myList=[]
>> for numbers in range(0,num,2):
>> print myList.append(numbers)
>>
>>
>> output-
>> >>> getNumbers(10)
>> None
>> None
>> None
>> None
>> None
>>
>> Then i find out that list.append doesn't return anything.Then what
>> should i use for this kind of operation.but if i do something like
>> this on idle's interpreter it gives me answer-
>> >>> myList=[]
>> >>> myList.append(8)
>> >>> print myList
>> [8]
>>
>> Confused!!!
>>
>>
>>
>> _______________________________________________
>> Tutor maillist - Tutor at python.org
>> To unsubscribe or change subscription options:
>> http://mail.python.org/mailman/listinfo/tutor
>
> If you seperate your print and the myList.append operation you will get
> what you want, which is why it works in IDLE. Are you sure you don't
> want to rather build your list, and return it from your function and
> then when you call it you do `print getNumbers(10)` if you wish.
>
> --
>
> Christian Witts
> Python Developer
>
> //
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>
> ------------------------------
>
> Message: 4
> Date: Tue, 11 Oct 2011 00:51:36 +1100
> From: Steven D'Aprano <steve at pearwood.info>
> To: tutor at python.org
> Subject: Re: [Tutor] I am trying to print list elements but i am
> getting 'none'
> Message-ID: <4E92F868.8060407 at pearwood.info>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Praveen Singh wrote:
>> This is my code-
>> def getNumbers(num):
>> myList=[]
>> for numbers in range(0,num,2):
>> print myList.append(numbers)
>>
>>
>> output-
>>>>> getNumbers(10)
>> None
>> None
>> None
>> None
>> None
>>
>> Then i find out that list.append doesn't return anything.Then what should
>> i
>> use for this kind of operation.but if i do something like this on idle's
>> interpreter it gives me answer-
>
>
> If you want to print the list after each append, then print the list
> after each append:
>
> def getNumbers(num):
> myList=[]
> for number in range(0, num, 2):
> myList.append(number)
> print mylist
>
>
> If you want to print the list once, at the end, then print it once, at
> the end, *outside* the loop:
>
> def getNumbers(num):
> myList=[]
> for number in range(0, num, 2):
> myList.append(number)
> print mylist
>
>
> --
> Steven
>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 10 Oct 2011 09:14:01 -0500
> From: Wayne Werner <waynejwerner at gmail.com>
> To: Praveen Singh <c2praveen30jun at gmail.com>
> Cc: tutor at python.org
> Subject: Re: [Tutor] I am trying to print list elements but i am
> getting 'none'
> Message-ID:
> <CAPM86Nf-s_5bH-doo3F9MYts22guwZ0zrL6RjiEp9aYfQkgJSQ at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On Mon, Oct 10, 2011 at 8:26 AM, Praveen Singh
> <c2praveen30jun at gmail.com>wrote:
>
>> print myList.append(numbers)
>
>
> Your problem is with that statement.
>
>>>> mylist = []
>>>> x = mylist.append(3)
>>>> x
>>>> x is None
> True
>>>> help(mylist.append)
> Help on built-in function append:
>
> append(...)
> L.append(object) -- append object to end
>
>
> append returns None (all functions do, unless you explicitly return
> something that is not None)
>
> HTH,
> Wayne
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> ------------------------------
>
> Message: 6
> Date: Mon, 10 Oct 2011 17:52:00 +0100
> From: Bod Soutar <bodsda at googlemail.com>
> To: Praveen Singh <c2praveen30jun at gmail.com>
> Cc: tutor at python.org
> Subject: Re: [Tutor] I am trying to print list elements but i am
> getting 'none'
> Message-ID:
> <CAG6Bxkc-PP4zQA80bqwHO5wu8ePYf2Am_OBk_ASFRW1umF8vTw at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 10 October 2011 14:26, Praveen Singh <c2praveen30jun at gmail.com> wrote:
>> This is my code-
>> ?def getNumbers(num):
>> ??? myList=[]
>> ??? for numbers in range(0,num,2):
>> ????????? print myList.append(numbers)
>>
>>
>> output-
>>>>> getNumbers(10)
>> None
>> None
>> None
>> None
>> None
>>
>> Then i find out that list.append doesn't return anything.Then what should
>> i
>> use for this kind of operation.but if i do something like this on idle's
>> interpreter it gives me answer-
>>>>> myList=[]
>>>>> myList.append(8)
>>>>> print myList
>> [8]
>>
>> Confused!!!
>>
>>
>>
>> _______________________________________________
>> Tutor maillist ?- ?Tutor at python.org
>> To unsubscribe or change subscription options:
>> http://mail.python.org/mailman/listinfo/tutor
>>
>>
>
> Print your list after you have appended to it.
>
> def getNumbers(num):
> myList=[]
> for numbers in range(0,num,2):
> myList.append(numbers)
>
> for item in list:
> print item
>
>
> ------------------------------
>
> _______________________________________________
> Tutor maillist - Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
>
>
> End of Tutor Digest, Vol 92, Issue 54
> *************************************
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