[Tutor] Help merge files using python
jarod_v6 at libero.it
jarod_v6 at libero.it
Wed Nov 13 23:26:51 CET 2013
Hi I want to merge many files like this:
#file1
A 10
B 20
C 30
#file2
B 45
Z 10
#file1
A 60
B 70
C 10
I want to obtain
A 10 0 60
B 20 45 70
C 30 0 10
Z 0 10 0
I try to do like this:
f = os.listdir(".")
for i in f:
T =open(i,"r")
for r in t.readlines():
print r
Could you please help me to understand how to use the right procedure in
python?Thanks a lot!
bw
----Messaggio originale----
>Da: tutor-request at python.org
>Data: 23/10/2013 1.43
>A: <tutor at python.org>
>Ogg: Tutor Digest, Vol 116, Issue 58
>
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>Today's Topics:
>
> 1. Re: Beginner Question (Andy McKenzie)
> 2. Re: Beginner Question (Dave Angel)
> 3. comma in an assignment (Key, Gregory E (E S SF RNA FSF 1 C))
> 4. Howto handle pictures with pyqt (Ulrich Goebel)
> 5. Re: Beginner Question (Sven Hennig)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 22 Oct 2013 13:26:08 -0400
>From: Andy McKenzie <amckenzie4 at gmail.com>
>To: "tutor at python.org" <tutor at python.org>
>Subject: Re: [Tutor] Beginner Question
>Message-ID:
> <CAJttDkrEpao=0FZecbP4ntbNu3A2zZ1fthhT=JroG8qRj97ifw at mail.gmail.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>On Tue, Oct 22, 2013 at 10:25 AM, Sven Hennig <shennig93 at googlemail.
com>wrote:
>
>> Hello, I would like to learn a programming language and have decided to
>> use Python. I have some programming experience and doing well in Python.
>> What really causes me problems is OOP.
>> I'm just dont get it... I'm missing a really Practical example. In every
>> book I've read are the examples of such Class Dog and the function is bark
>> . Has anyone an OOP example for me as it is really used in real code, so
>> I can better understand the concept? I do not know why this is so hard for
>> me.
>>
>> Greetings
>> Sven
>>
>>
>The actual code I have is in PHP, so it's not exactly useful to post here,
>but I can give you an outline of a class I used and found useful. The
>class was created to help me manipulate network subnets in an interface to
>handle DHCP and DNS on a server.
>
>class subnet:
>
> def __init__(cidr):
> # Do some stuff with the CIDR notation of the subnet (1.2.3.0/24syntax)
>
> def netmask:
> # Calculate the netmask and return it (ie, 255.255.255.0)
>
> def first_ip:
> # Calculate and return the first IP in the range.
>
> def last_ip:
> # Calculate and return the last IP in the range
>
> def number_of_addresses:
> # Calculate the number of usable addresses in the range and return
>that value
>
>The benefit to me was that I could create an instance of the subnet object
>for a group (say, "lab_1"), and then pull out various information. Calling
>"lab_1.first_ip()" returns the first possible IP address. That was a lot
>more readable and a lot more concise than something like "first_ip(
>1.2.3.0/24)".
>
>
>I hope this helps!
>
>Andy
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>------------------------------
>
>Message: 2
>Date: Tue, 22 Oct 2013 17:55:29 +0000 (UTC)
>From: Dave Angel <davea at davea.name>
>To: tutor at python.org
>Subject: Re: [Tutor] Beginner Question
>Message-ID: <l46e6h$ori$1 at ger.gmane.org>
>Content-Type: text/plain; charset=US-ASCII
>
>On 22/10/2013 10:25, Sven Hennig wrote:
>
>> Hello, I would like to learn a programming language and have decided to
use
>> Python. I have some programming experience and doing well in Python. What
>> really causes me problems is OOP.
>> I'm just dont get it... I'm missing a really Practical example. In every
>> book I've read are the examples of such Class Dog and the function is bark.
Has
>> anyone an OOP example for me as it is really used in real code, so I can
>> better understand the concept? I do not know why this is so hard for me.
>>
>
>What you may not realize is you're already doing OOP, just by using the
>standard library. When you open a file (or many other things that can
>produce a stream of bytes), you get an instance of class file. When you
>use that instance, you're calling methods of that instance. So when you
>say:
>
>infile = open("myfile.txt,"r")
>data = infile.readline()
>
>you're doing object oriented programming. You don't have to know what
>kind of thing "infile" is, you just have to know it has methods read(),
>readline(), close(), etc.
>
>When you want to write your own classes, or when you want to make a new
>class that's related but different from one of the thousands that are
>standard, that's when it gets interesting. As Alan says, GUI is one
>place where you'll be wrting your own classes, usually by deriving from
>one of the GUI library classes.
>
>At its most fundamental, a class is a description of how to create and
>how to manipulate instances. An instance has methods (functions), and
>attributes (data). When one class is derived from another, it can share
>some or most of the attributes and behavior of the parent class, but
>make changes. This helps avoid duplicating code when two things are
>similar.
>
>You're familiar with list and tuple. Those are built-in
>collection classes, supported explicitly by the language. But if you
>want your own collection, you may want to make a class for it. The Dog
>bark() example may seem silly, but a Dog has lots of other methods
>besides that one, and has lots of attributes (color, breed, health
>state, owner, etc.). In a sense those attributes are like a list within
>the Dog, but you want them to have nice names, instead of remembering
>that the 3rd one is owner.
>
>
>--
>DaveA
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Tue, 22 Oct 2013 19:20:25 +0000
>From: "Key, Gregory E (E S SF RNA FSF 1 C)" <gregory.key at siemens.com>
>To: "tutor at python.org" <tutor at python.org>
>Subject: [Tutor] comma in an assignment
>Message-ID:
> <5C28117E8FDB0E4F999E3CB30775EF5901F9A5 at USLZUA0EM21MSX.ww017.siemens.net>
>
>Content-Type: text/plain; charset="us-ascii"
>
>I understand that a comma in Python is a separator and not an operator. In
some of the MatPlotLib examples I see code like this:
>
>line1, = ax1.plot(t, y1, lw=2, color='red', label='1 HZ')
>
>What does the comma do in an assignment statement?
>
>Greg Key
>
>
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>------------------------------
>
>Message: 4
>Date: Tue, 22 Oct 2013 23:21:20 +0200
>From: Ulrich Goebel <ml at fam-goebel.de>
>To: tutor at python.org
>Subject: [Tutor] Howto handle pictures with pyqt
>Message-ID: <5266EC50.9070307 at fam-goebel.de>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Hello,
>
>for my first python program I try to build a user interface for a litle
>address database. Therefor I use pyqt to build the formular, and later I
>will connect it to an existing SQLite DB, using APSW.
>
>Besides the "normal" things as name, address, email and others I want to
>store an image. Normaly that will be given as a file (.jpg, .png, or
>other type). I would let the user find the picture with a
>QFileDialog.getOpenFileName() dialog. But what to do after that? Here
>are my questions:
>
>Which widget is able to show the picture?
>
>How to show the picture? That means: howto put the picture from the file
>into the widget?
>
>How to put the picture data into an blob(?) column in the database?
>
>How to get the data back from there and bring it in the widget?
>
>May be there is a tutorial which I didn't find yet?
>
>Thank's a lot for any help!
>
>Greetings
>Ulrich
>
>--
>Ulrich Goebel
>Paracelsusstr. 120, 53177 Bonn
>
>
>------------------------------
>
>Message: 5
>Date: Tue, 22 Oct 2013 20:18:28 +0200
>From: Sven Hennig <shennig93 at googlemail.com>
>To: tutor at python.org
>Subject: Re: [Tutor] Beginner Question
>Message-ID:
> <CACCMqHysQF-Bpuf5fRRLnNf+tvZox7dBKjOr8gvHkYAQy3Y+FA at mail.gmail.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>Thank you! You guys helped me out alot.
>
>@Alan your website is great! Really clearly written. Especially the "Things
>to remember" part.
>
>If you have exercises for me or have a Website with exercises, bring it on. I
>think this is the best way to learn.
>
>
>
>2013/10/22 Dave Angel <davea at davea.name>
>
>> On 22/10/2013 10:25, Sven Hennig wrote:
>>
>> > Hello, I would like to learn a programming language and have decided to
>> use
>> > Python. I have some programming experience and doing well in Python. What
>> > really causes me problems is OOP.
>> > I'm just dont get it... I'm missing a really Practical example. In every
>> > book I've read are the examples of such Class Dog and the function is
>> bark. Has
>> > anyone an OOP example for me as it is really used in real code, so I can
>> > better understand the concept? I do not know why this is so hard for me.
>> >
>>
>> What you may not realize is you're already doing OOP, just by using the
>> standard library. When you open a file (or many other things that can
>> produce a stream of bytes), you get an instance of class file. When you
>> use that instance, you're calling methods of that instance. So when you
>> say:
>>
>> infile = open("myfile.txt,"r")
>> data = infile.readline()
>>
>> you're doing object oriented programming. You don't have to know what
>> kind of thing "infile" is, you just have to know it has methods read(),
>> readline(), close(), etc.
>>
>> When you want to write your own classes, or when you want to make a new
>> class that's related but different from one of the thousands that are
>> standard, that's when it gets interesting. As Alan says, GUI is one
>> place where you'll be wrting your own classes, usually by deriving from
>> one of the GUI library classes.
>>
>> At its most fundamental, a class is a description of how to create and
>> how to manipulate instances. An instance has methods (functions), and
>> attributes (data). When one class is derived from another, it can share
>> some or most of the attributes and behavior of the parent class, but
>> make changes. This helps avoid duplicating code when two things are
>> similar.
>>
>> You're familiar with list and tuple. Those are built-in
>> collection classes, supported explicitly by the language. But if you
>> want your own collection, you may want to make a class for it. The Dog
>> bark() example may seem silly, but a Dog has lots of other methods
>> besides that one, and has lots of attributes (color, breed, health
>> state, owner, etc.). In a sense those attributes are like a list within
>> the Dog, but you want them to have nice names, instead of remembering
>> that the 3rd one is owner.
>>
>>
>> --
>> DaveA
>>
>>
>> _______________________________________________
>> Tutor maillist - Tutor at python.org
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