Path: csiph.com!eternal-september.org!feeder.eternal-september.org!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed7.news.xs4all.nl!nzpost1.xs4all.net!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.003
X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'interpreter,': 0.09; 'nameerror:': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:version': 0.09; 'python': 0.10; 'python.': 0.11; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-ipconnect.de': 0.16; 'recognise': 0.16; 'subject:Problem': 0.16; 'ways:': 0.16; 'wrote:': 0.16; 'script.': 0.18; '>>>': 0.20; '"",': 0.22; 'assumes': 0.22; 'defined': 0.23; 'help.': 0.23; 'import': 0.24; '(most': 0.24; 'downloaded': 0.24; 'module': 0.25; 'header:User- Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'function': 0.28; 'actual': 0.28; 'question:': 0.29; 'tutorial': 0.29; 'typically': 0.29; 'error.': 0.31; 'getting': 0.33; 'problem': 0.33; 'traceback': 0.33; 'file': 0.34; 'could': 0.35; 'text': 0.35; 'done': 0.35; 'knowledge': 0.35; 'there': 0.36; 'possible': 0.36; 'basic': 0.36; 'modules': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'two': 0.37; 'received:org': 0.37; '(2)': 0.37; 'version': 0.38; '(1)': 0.38; 'mean': 0.38; 'does': 0.39; 'subject:the': 0.39; 'to:addr:python.org': 0.40; 'received:de': 0.40; 'software': 0.40; 'your': 0.60; 'qualified': 0.63; '2.8': 0.84; '3.4': 0.84; 'michel': 0.84; 'mean.': 0.91
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: Problem to calculate the mean in version 3.4
Date: Fri, 25 Sep 2015 09:09:16 +0200
Organization: None
References: <F4A60959-BFA5-46CC-B83C-9D50CE2D1D00@yahoo.co.uk>
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7Bit
X-Gmane-NNTP-Posting-Host: p57bd9b0b.dip0.t-ipconnect.de
User-Agent: KNode/4.13.3
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.20+
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.164.1443164969.28679.python-list@python.org>
Lines: 36
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1443164969 news.xs4all.nl 23749 [2001:888:2000:d::a6]:42027
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:97118

Michel Guirguis wrote:

> I have downloaded the version 3.4 and I have a problem to calculate the
> mean. The software does not recognise the function mean(). I am getting
> the following error.
> 
>>>> mean([1, 2, 3, 4, 4])
> Traceback (most recent call last):
>   File "<pyshell#4>", line 1, in <module>
>     mean([1, 2, 3, 4, 4])
> NameError: name 'mean' is not defined
> 
> Could you please help. Is it possible to send me the version that
> calculate statistics.

The help for the statistics and other modules assumes basic knowledge of 
Python. I recommend you read the tutorial or any other introductory text on 
Python before you proceed.

Regarding your actual question: before you can use a function you have to 
import it. There are two ways:

(1) Recommended: import the module and use the qualified name:

>>> import statistics
>>> statistics.mean([1, 2, 3, 4, 4])
2.8

(2) Import the function. Typically done when you want to use it in the 
interactive interpreter, not in a script.

>>> from statistics import mean
>>> mean([1, 2, 3, 4, 4])
2.8