Re: [Tutor] Confused about "import Numeric" vs "import numpy" for Arrays
> Another reason not to use "from xx import *" is that it can make it > very difficult to discover where a name is defined. If you have > several "from xx import *" lines and then later you use a function > "foo()" there is no easy way to tell which module foo came from. > > An alternative is to list just the names you want to import: > from xx import foo > > Kent > Kent - Another great point. Thanks for contributing to the list. Samir ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Confused about "import Numeric" vs "import numpy" forArrays
> A useful tip is that if you have a long module name you can also use > > import module as shortname > > eg > > import numpy as n > > and then access numpy.foo() as > > n.foo() > > Sacves a lot of typing for a slight loss of clarity in > maintenance - you have to remember which module the > short names refer to! I tend to use full names in real code > and use the abbreviated form when using the >>> prompt. > Alan - Great suggestion! As I'm reading through the numpy documentation, there are a lot of great functions that I'd like to learn to use so your advice definitely helps. I was getting tired of constantly having to type "numpy.array" or "numpy.ones" all the time. Thanks again. Samir ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Confused about "import Numeric" vs "import numpy" for Arrays
> In general "from import *" is a very bad idea. > > import imports a module into its own namespace (e.g., to > access its functionality you would have to do ".foo() and > .bar()" The form that you chose to use imports all of a > module's contents into the current namespace. This means you can call > "foo()" and "bar()" directly, but it also means that if you have coded > a "foo()" and a "bar()" you will not have access to the functions in > the module you just imported. > Timothy, Thanks for the clarification. I had always wondered what the difference was. Samir ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Confused about "import Numeric" vs "import numpy" for Arrays
> No, they are not the same. Numeric is older; NumArray is another older > package. You should use Numpy if you can. > http://numpy.scipy.org/#older_array > > > Now you should be able to import numpy. > > Kent > Thanks, Kent. I ended up using: >>> from numpy import * I wasn't sure what the difference was between this and >>> import numpy Thanks! Samir ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Confused about "import Numeric" vs "import numpy" for Arrays
Hi Everyone, I would like to create a two-dimensional array but am confused as to how to go about it. I've read about Numeric Python and Numpy. Are they one and the same? Also, how do I install them? I am working on a Windows machine. I've been getting the following error messages: >>> import Numeric Traceback (most recent call last): File "", line 1, in import Numeric ImportError: No module named Numeric >>> from Numeric import * Traceback (most recent call last): File "", line 1, in from Numeric import * ImportError: No module named Numeric I then downloaded and installed release 1.1.1 of the Numpy package from this site: http://sourceforge.net/project/showfiles.php?group_id=1369&package_id=175103 After restarting the shell, I still get the same errors above (though I do have this directory now: C:\Python25\Lib\site-packages\numpy). Anyone know how to correctly install and use this package? Thanks in advance. Samir ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Reading List from File
Emile, Amin: Thank you both for your replies. I was able to get it
working using:
>>> f = open(r'c:\test.txt', 'r')
>>> foo = f.readline().split(',')
Samir
On Thu, Jul 31, 2008 at 3:00 PM, <[EMAIL PROTECTED]> wrote:
> Emile is rigth, there should be a () there.
> I'm sorry, im writing this from my cellphone and there's not a pc around XD.
> I didn,t know about the csv module either and had to do over complicated
> things to deal with embedded commas, thx for that too :).
>
> --
> Amin Rainmaker
>
> -- Forwarded message --
> From: Emile van Sebille <[EMAIL PROTECTED]>
> To: tutor@python.org
> Date: Thu, 31 Jul 2008 11:34:56 -0700
> Subject: Re: [Tutor] Reading List from File
> S Python wrote:
>>>>>
>>>>> f = open(r'C:\test.txt', 'r')
>>>>> foo = f.readline.split(',')
>
> readline is the function/method name
> readline() executes that function/method and returns a value
>
> try typing in 'type(f.readline)' vs 'type(f.readline())'
>
> you can't .split() a function but you may split its return value.
>
>> but it fails when I try:
>>
>>>>> import csv
>>>>> myfile = open(r'c:\test.txt', 'r')
>>>>> data = csv.Reader(myfile, delimeter = ',')
>>
>
> Python is case sensitive -- reader is different from Reader.
>
> HTH,
>
> Emile
>
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Re: [Tutor] Reading List from File
Monika,
Thanks for your help. I got it to work using the following (also had
to spell "delimiter"):
>>> import csv
>>> myfile = open(r'c:\test.txt', 'r')
>>> data = csv.reader(myfile, delimiter=',')
>>> print data
<_csv.reader object at 0x00D41870>
>>> for item in data:
print item
['aaa', 'bbb', 'ccc']
I think it was referred to in another post, but I have found this page
to be helpful:
http://docs.python.org/lib/csv-examples.html
Thanks.
Samir
On Thu, Jul 31, 2008 at 2:20 PM, Monika Jisswel
<[EMAIL PROTECTED]> wrote:
> oops it is reader not Reader (all lower case), so this line : data =
> csv.Reader(myfile, delimeter = ',')
> should be data = csv.reader(myfile, delimeter = ',')
>
>
> 2008/7/31 S Python <[EMAIL PROTECTED]>
>>
>> Hi Everyone,
>>
>> Thanks for the variety of responses in such a short amount of time.
>> This distribution list is incredible.
>>
>> Sorry for the delayed reply as I wanted to test what everyone
>> suggested, so here goes:
>>
>> ---
>>
>> @Amin: I tried your suggestion, but perhaps I don't understand your
>> syntax. Here is what I tried and the resulting error message:
>>
>> >>> f = open(r'C:\test.txt', 'r')
>> >>> foo = f.readline.split(',')
>>
>> Traceback (most recent call last):
>> File "", line 1, in
>>foo = f.readline.split(',')
>> AttributeError: 'builtin_function_or_method' object has no attribute
>> 'split'
>>
>> Do you know what I did wrong?
>>
>> ---
>>
>> @Emad, Brett: Thank you for your solutions. They do exactly what I
>> was looking for.
>>
>> ---
>>
>> @Chad: Thanks for your suggestion. I think I like it best for its
>> simplicity.
>>
>> ---
>>
>> @Emile, Monika, kinuthi: The CSV standard library looks interesting
>> but I am having mixed results in implementing it. For example, it
>> works when I try this:
>>
>> >>> reader = csv.reader(open(r'c:\test.txt', 'rb'))
>> >>> for row in reader:
>>print row
>>
>>
>> ['aaa', 'bbb', 'ccc']
>>
>> but it fails when I try:
>>
>> >>> import csv
>> >>> myfile = open(r'c:\test.txt', 'r')
>> >>> data = csv.Reader(myfile, delimeter = ',')
>>
>> Traceback (most recent call last):
>> File "", line 1, in
>>data = csv.Reader(myfile, delimeter = ',')
>> AttributeError: 'module' object has no attribute 'Reader'
>>
>> The error looks similar to what I received when I tried Amin's
>> approach. Am I missing something?
>>
>> ---
>>
>> It's interesting to note that for the solutions to work correctly, I
>> had to remove the quotation marks from the input file.
>>
>> Thanks again to EVERYONE who took the time to respond. I appreciate your
>> help.
>>
>> Samir
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>
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Re: [Tutor] Reading List from File
Hi Everyone,
Thanks for the variety of responses in such a short amount of time.
This distribution list is incredible.
Sorry for the delayed reply as I wanted to test what everyone
suggested, so here goes:
---
@Amin: I tried your suggestion, but perhaps I don't understand your
syntax. Here is what I tried and the resulting error message:
>>> f = open(r'C:\test.txt', 'r')
>>> foo = f.readline.split(',')
Traceback (most recent call last):
File "", line 1, in
foo = f.readline.split(',')
AttributeError: 'builtin_function_or_method' object has no attribute 'split'
Do you know what I did wrong?
---
@Emad, Brett: Thank you for your solutions. They do exactly what I
was looking for.
---
@Chad: Thanks for your suggestion. I think I like it best for its simplicity.
---
@Emile, Monika, kinuthi: The CSV standard library looks interesting
but I am having mixed results in implementing it. For example, it
works when I try this:
>>> reader = csv.reader(open(r'c:\test.txt', 'rb'))
>>> for row in reader:
print row
['aaa', 'bbb', 'ccc']
but it fails when I try:
>>> import csv
>>> myfile = open(r'c:\test.txt', 'r')
>>> data = csv.Reader(myfile, delimeter = ',')
Traceback (most recent call last):
File "", line 1, in
data = csv.Reader(myfile, delimeter = ',')
AttributeError: 'module' object has no attribute 'Reader'
The error looks similar to what I received when I tried Amin's
approach. Am I missing something?
---
It's interesting to note that for the solutions to work correctly, I
had to remove the quotation marks from the input file.
Thanks again to EVERYONE who took the time to respond. I appreciate your help.
Samir
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[Tutor] Reading List from File
Hi Everyone,
I am trying to read a comma-delimitted list ("aaa","bbb","ccc") from a text
file and assign those values to a list, x, such that:
x = ["aaa", "bbb", "ccc"]
The code that I have come up with looks like this:
>>> x = []
>>> f = open(r'c:\test.txt', 'r')
>>> x.extend(f.readlines())
>>> x
['"aaa","bbb","ccc"']
If you look closely, there is an extra pair of single quotes (') that
encapsulates the string. Therefore, len(x) returns 1, instead of 3. Is
there a function to "separate" this list out? I hope my question makes
sense.
Thanks in advance.
Samir
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Re: [Tutor] (no subject)
Hi Morgan, Have you installed Python on your computer? If you are using Microsoft Windows, you can download and install Python from here: http://python.org/download/releases/2.5.2/ and select "python-2.5.2.msi". Once it's installed, you should have a directory on your machine called "C:\python25". If you save your program with a .py extension in that folder (for example, call it morgan.py), then all you have to do is open a command window (Start > Run and enter "cmd"), go to the C:\python25 directory, and type: python morgan.py Personally, if you are just staring out to program, I would recommend using the Python shell that comes with the package I referred to. Alan's tutorial, found here: http://www.freenetpages.co.uk/hp/alan.gauld/ is very helpful, as is this site, which is what I used to start learning Python: http://hkn.eecs.berkeley.edu/~dyoo/python/idle_intro/ Hope that helps. Good luck! Samir On Tue, Jul 29, 2008 at 7:27 AM, Morgan Thorpe <[EMAIL PROTECTED]>wrote: > Hello. > > I'm am very new to the whole programming sence. > I am trying to catch on but as soon as i want to write a program i've been > told to use like 'notepad' in windows XP and save it as a .py file > i have gotten this far. Am i wrong so far? > If i am right why is it that i can't run it in anyway besides it opening in > 'notepad' i've tried opening with Python but it doesn't work. > > Thanks, >Morgan > -- > This message has been scanned for viruses and dangerous content by the BCEC > Security Gateway, and is believed to be clean. Brisbane Catholic Education > however gives no warranties that this e-mail is free from computer viruses > or other defects. Except for responsibilities implied by law that cannot be > excluded, Brisbane Catholic Education, its employees and agents will not be > responsible for any loss, damage or consequence arising from this e-mail. > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
