Re: [Tutor] Why is this only catching one occurance?
Chris Hengge wrote: Here is my code: for unWantedItem in directoryList: try: if hex in unWantedItem.lower(): if not bmc in unWantedItem.lower(): print unWantedItem + removed! directoryList.remove(unWantedItem) This only seems to loop through once, and removes 1 of 2 occurances from this list that should be captured. Should for keep the list going through each instance? You're removing stuff from something you're iterating over! *slaps your fingers with a ruler* Make a copy of the list! HTH, -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Why is this only catching one occurance?
Here is my code:for unWantedItem in directoryList: try: if hex in unWantedItem.lower(): if not bmc in unWantedItem.lower(): print unWantedItem + removed! directoryList.remove(unWantedItem)This only seems to loop through once, and removes 1 of 2 occurances from this list that should be captured. Should for keep the list going through each instance? Thanks alot. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
Oh, ok :D Luke Paireepinart escreveu: rolando wrote: I just use the reply button in my Thunderbird, and then change the email I want to send to tutor@python.org It's better to use reply-all, in my opinion, because then, if someone's involved in an e-mail thread, they'll get an instant update on it even if they only get the Tutor Digest and not every individual mail. Cheers, -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Witch gui to choose for this script?
rolando wrote: Well, I don't know if I can ask this question here, but never mind that :) It´s like this, I created this python script that translates human language to Al-bhed language (it's a language from the game Final Fantasy 10, it's basicly a change in the letters for example A becomes W or B become H). Since I like the script, and it's my first program, I am now trying to create a GUI for it. So what do you recommend? I don't think something like this lends itself to a particular GUI set, so the question I have to ask you is: Do you feel lucky? Just kidding. It's really up to you on this one. TKInter would probably be easier to learn, since it's your first program. You could go the route of a GUI builder such as Boa Constructor, but I'd recommend that you learn how to use a GUI toolkit before you use a builder, so that you know exactly what the builder is automating for you. However, are you sure you want to jump into a GUI right now? If you're just going for a simple two-textbox, one button, 'type here, hit the button, and the translated text appears in the other box' type thing, and not something fancy, I guess it's about as simple of an introduction to a GUI toolkit as you can get, aside from a label that says Hello, World or other such thing. Just remember that it's important that you have a firm understanding of python's built-ins, and I guess Python in general, before you start trying to use a big external package like a GUI toolkit, and a little up-front time learning the basics will help you a great deal in the long run. I'm going to attach the script, just in case you want to see it. Good job on attaching the script! I did want to see it. I can't read the comments, though, but I think I got what it was doing. Good luck in whatever you choose to do. -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] line number when reading files using csv module
If I have the following data file, data.csv:
1 2 3
2 3 4 5
then I can read it in Python 2.4 on linux using:
import csv
f = file('data.csv', 'rb')
reader = csv.reader(f)
for data in reader:
print data
OK, that's all well and good, but I would like to record
the line number in the file. According to the documentation,
each reader object has a public 'line_num' attribute
http://docs.python.org/lib/node265.html and
http://docs.python.org/lib/csv-examples.html supports this.
If I now change the loop to read:
for data in reader:
print reader.line_num, data
I'm presented with the error:
AttributeError: '_csv.reader' object has no attribute 'line_num'
This has floored me. I've even looked at the source code and I can
see the line_num variable in the underlying _csv.c file. I can even
see the test_csv.py code that checks it!
def test_read_linenum(self):
r = csv.reader(['line,1', 'line,2', 'line,3'])
self.assertEqual(r.line_num, 0)
I suspect this is something so obvious that I just can't see the
wood for the trees and I will kick myself.
Any ideas?
Cheers
Duncan
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Re: [Tutor] Witch gui to choose for this script?
If you're just going for a simple two-textbox, one button, 'type here,
hit the button, and the translated text appears in the other box'
Yeah, its something like that :D
Nothing to much fancy, it just that it can get kind of boring always
going to the linux console to run the script.
I'm going to try the Boa Contructor.
I'm going to attach the script, just in case you want to see it.
Good job on attaching the script!
I did want to see it.
I can't read the comments, though, but I think I got what it was doing.
Yeah, I kind of forgot to translate the comments.
Now I have attached the script with the translated comments.
Also any comments about the program are welcome.
Luke Paireepinart escreveu:
rolando wrote:
Well, I don't know if I can ask this question here, but never mind
that :)
It´s like this, I created this python script that translates human
language to Al-bhed language (it's a language from the game Final
Fantasy 10, it's basicly a change in the letters for example A
becomes W or B become H).
Since I like the script, and it's my first program, I am now trying
to create a GUI for it.
So what do you recommend?
I don't think something like this lends itself to a particular GUI set,
so the question I have to ask you is:
Do you feel lucky?
Just kidding.
It's really up to you on this one.
TKInter would probably be easier to learn, since it's your first program.
You could go the route of a GUI builder such as Boa Constructor, but
I'd recommend that you learn
how to use a GUI toolkit before you use a builder, so that you know
exactly what the builder is automating for you.
However, are you sure you want to jump into a GUI right now?
If you're just going for a simple two-textbox, one button, 'type here,
hit the button, and the translated text appears in the other box'
type thing, and not something fancy, I guess it's about as simple of
an introduction to a GUI toolkit as you can get, aside from a
label that says Hello, World or other such thing.
Just remember that it's important that you have a firm understanding
of python's built-ins, and I guess Python in general,
before you start trying to use a big external package like a GUI
toolkit, and a little up-front time learning the basics will help you
a great deal in the long run.
I'm going to attach the script, just in case you want to see it.
Good job on attaching the script!
I did want to see it.
I can't read the comments, though, but I think I got what it was doing.
Good luck in whatever you choose to do.
-Luke
#!/usr/bin/python
#V 0.4
import string
contador = s # Creates a counter that checks if it should run the script or not
while contador.lower() == s or contador.lower() == sim: # While the counter is a lower s or sim (that's yes in portuguese) the program doesn't quit
print Escolhe a lingua que queres traduzir. [p]ortugues ou [a]l-bhed
lingua = raw_input() # Chosse the language to translate
if lingua.isspace() == True: # If lingua is only white space
print Tens de escrever alguma coisa ok?
if lingua == : # If lingua is empty
print Tens de escrever alguma coisa ok?
if lingua.lower() == a or lingua.lower() == al-bhed:
lista = string.maketrans('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 'epstiwknuvgclrybxhmdofzqajEPSTIWKNUVGCLRYBXHMDOFZQAJ') # Creates the list of letter, and the way they are going to be changed
print Escreve a palavra que queres traduzir.
palavra = raw_input() # Ask for a word
print + palavra.translate(lista) + # Print the translated words
if lingua.lower() == p or lingua.lower() == portugues:
lista = string.maketrans('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 'ypltavkrezgmshubxncdijfqowYPLTAVkREZGMSHUBXNCDIJFQOW') # Creates the list of letter, and the way they are going to be changed
print Escreve a palavra que queres traduzir.
palavra = raw_input() # Ask for a word
print + palavra.translate(lista) + # Print the translated words
print Ainda tens mais alguma coisa para traduzir? [S/N]
contador = raw_input() # Possibility of changing the counter in the begging of the script
if contador.lower() == n or contador.lower() == nao: # If counter equals lower n or nao (that portugues for no) the program quits and prints the lower message
print Entao adeus.
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[Tutor] database question
I'm learning to use python with the database mysql. I'm writing a widget in pygtk that should show the results of a sql query. For example with SELECT * FROM a, I use this code count = 0 a = db.cursor.description for tuple in a: print tuple[0][0] count = count + 1 ... to know how many columns are in the result, and then, what I have to do is to create a liststore with count columns. The method to create a ListStore is: liststore = gtk.ListStore(str, str, str, ...[number of columns]). I was wondering how to create the liststore with the proper number of columns, if there would a way to do something like this with python: # to store the number of columns that will be needed count = 0 a = db.cursor.description for tuple in a: print tuple[0][0] count = count + 1 # this is the string with the method to execute method_string = gtk.ListStore( for var in range(count): method_string = function_string + str, function_string = function_string + ) # is there something like this execute_function? list_store = execute_function(method_string) Thank you very much for your advices. __ LLama Gratis a cualquier PC del Mundo. Llamadas a fijos y móviles desde 1 céntimo por minuto. http://es.voice.yahoo.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Witch gui to choose for this script?
rolando wrote:
Well, I don't know if I can ask this question here, but never mind that :)
Yes, it's fine.
It´s like this, I created this python script that translates human
language to Al-bhed language (it's a language from the game Final
Fantasy 10, it's basicly a change in the letters for example A becomes W
or B become H).
Since I like the script, and it's my first program, I am now trying to
create a GUI for it.
So what do you recommend?
I think Tkinter is the easiest to get started with. You might also like
to try PythonCard which is a wrapper around wxPython that makes it
easier to use.
I'm going to attach the script, just in case you want to see it.
I have a few comments below.
#!/usr/bin/python
#V 0.4
import string
contador = s # Cria um contador que verifica que deve ou nao executar o
script
while contador.lower() == s or contador.lower() == sim: # Enquanto o
valor for s ou sim o programa nao sai (converte a palavra em minusculas)
print Escolhe a lingua que queres traduzir. [p]ortugues ou [a]l-bhed
lingua = raw_input() # Escolhe a lingua
if lingua.isspace() == True: # Se lingua e constituida por espacos em
branco
print Tens de escrever alguma coisa ok?
if lingua == : # Se lingua estiver vazia
print Tens de escrever alguma coisa ok?
These two tests could be combined into
if not lingua.strip():
print Tens de escrever alguma coisa ok?
if lingua.lower() == a or lingua.lower() == al-bhed:
lista =
string.maketrans('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
'epstiwknuvgclrybxhmdofzqajEPSTIWKNUVGCLRYBXHMDOFZQAJ') # Cria a lista de
palavra e de que maneira vao ser trocadas
print Escreve a palavra que queres traduzir.
palavra = raw_input() # Pede por uma palavra
print + palavra.translate(lista) + # Imprime as palavras
trocadas
if lingua.lower() == p or lingua.lower() == portugues:
lista =
string.maketrans('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
'ypltavkrezgmshubxncdijfqowYPLTAVkREZGMSHUBXNCDIJFQOW') # Cria a lista de
palavra e de que maneira vao ser trocadas
I would define the two listas outside the loop at the top of the program
and give them more descriptive names like portugueseToAlBled. I think it
would make the loop easier to read.
Kent
print Escreve a palavra que queres traduzir.
palavra = raw_input() # Pede por uma palavra
print + palavra.translate(lista) + # Imprime as palavras
trocadas
You don't need the extra , just print palavra.translate(lista).
Kent
print Ainda tens mais alguma coisa para traduzir? [S/N]
contador = raw_input() # Modifica o contador que esta inicio do script
if contador.lower() == n or contador.lower() == nao: # Se contador igual
a n ou nao minusculos
print Entao adeus.
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Re: [Tutor] line number when reading files using csv module
On Fri, 27 Oct 2006 11:35:40 +0200
Duncan Gibson [EMAIL PROTECTED] wrote:
If I have the following data file, data.csv:
1 2 3
2 3 4 5
then I can read it in Python 2.4 on linux using:
import csv
f = file('data.csv', 'rb')
reader = csv.reader(f)
for data in reader:
print data
Oops, mixing examples here. I forgot to say that
I'm actually using
reader = csv.reader(f, delimiter=' ')
so it will read the data correctly even if there
isn't a comma in sight in the csv file, but that's
a side issue to the line number problem.
Cheers
Duncan
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Re: [Tutor] Why is this only catching one occurance?
Chris Hengge wrote: Here is my code: for unWantedItem in directoryList: try: if hex in unWantedItem.lower(): if not bmc in unWantedItem.lower(): print unWantedItem + removed! directoryList.remove(unWantedItem) This only seems to loop through once, and removes 1 of 2 occurances from this list that should be captured. Should for keep the list going through each instance? The problem is that when you remove the item from the list, the iterator that is looping over the list gets confused and skips the next item. (The iterator keeps an internal counter that is not updated when you remove an item.) See http://effbot.org/zone/python-list.htm#modifying for more. The simplest fix is to use a list comprehension to create a new list with only the elements you want, and assign it to the same name: directoryList = [ item for item in directoryList if 'hex not in item.lower() or 'bmc' in item.lower() ] Note I changed the sense of the conditional because it is now selecting items to include. The list comp doesn't have exactly the same result as your (intended) code, it creates a new list rather than modifying the old one in place. Most of the time this doesn't matter but if you have other references to dictionaryList only one will be changed. Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] line number when reading files using csv module
Duncan Gibson wrote:
If I have the following data file, data.csv:
1 2 3
2 3 4 5
then I can read it in Python 2.4 on linux using:
import csv
f = file('data.csv', 'rb')
reader = csv.reader(f)
for data in reader:
print data
OK, that's all well and good, but I would like to record
the line number in the file. According to the documentation,
each reader object has a public 'line_num' attribute
http://docs.python.org/lib/node265.html and
http://docs.python.org/lib/csv-examples.html supports this.
If I now change the loop to read:
for data in reader:
print reader.line_num, data
I'm presented with the error:
AttributeError: '_csv.reader' object has no attribute 'line_num'
The line_num attribute is new in Python 2.5. This is a doc bug, it
should be noted in the description of line_num.
Kent
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[Tutor] XML parsing in Python.. resources needed
Hi Folks, ANy comments about ELementTree module... I have heard that it is more 'Pythonic'... I need some basic examples to start learning the stuff.. If anyone has got the information, please pass it along.. Thanks. Regards, Asrarahmed Kadri-- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] XML parsing in Python.. resources needed
Asrarahmed Kadri wrote: Hi Folks, ANy comments about ELementTree module... I have heard that it is more 'Pythonic'... I need some basic examples to start learning the stuff.. If anyone has got the information, please pass it along.. http://effbot.org/zone/element.htm Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] I am terribly confused about generators and iterators.. Help me
Hi Folks, What are generators and iterators...??And why are they areneeded..?? I can domy stuff with a 'for' or a 'while' loop.. so why do I need an ITERATOR..? And what is a generator ..? I did try to read about these two things on the web, but still I AM CONFUSED. To be honest, I am used to the nice and lucid style of the wonderful people on this forum.. :)- Regards, Asrarahmed Kadri -- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] line number when reading files using csv module
Kent Johnson wrote:
The line_num attribute is new in Python 2.5. This is a doc bug,
it should be noted in the description of line_num.
Is there some way to create a wrapper around a 2.4 csv.reader to
give me pseudo line number handling? I've been experimenting with:
import csv
class MyReader(object):
def __init__(self, inputFile):
self.reader = csv.reader(inputFile, delimiter=' ')
self.lineNumber = 0
def __iter__(self):
self.lineNumber += 1
return self.reader.__iter__()
def next(self):
self.lineNumber += 1# do I need this one?
return self.reader.next()
if __name__ == '__main__':
inputFile = file('data.csv', 'rb')
reader = MyReader(inputFile)
for data in reader:
print reader.lineNumber, data
But that doesn't seem to do what I want. If I add some print statements
to the methods, I can see that it calls __iter__ only once:
__iter__
1 ['1', '2', '3']
1 ['2', '3', '4', '5']
1 ['3', '4', '5', '6', '7']
1 ['4', '5', '6', '7']
1 ['5', '6', '7', '8', '9']
Is there some other __special__ method that I need to forward to the
csv.reader, or have I lost all control once __iter__ has done its job?
Cheers
Duncan
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Re: [Tutor] line number when reading files using csv module
Duncan Gibson wrote:
Kent Johnson wrote:
The line_num attribute is new in Python 2.5. This is a doc bug,
it should be noted in the description of line_num.
Is there some way to create a wrapper around a 2.4 csv.reader to
give me pseudo line number handling? I've been experimenting with:
import csv
class MyReader(object):
def __init__(self, inputFile):
self.reader = csv.reader(inputFile, delimiter=' ')
self.lineNumber = 0
def __iter__(self):
self.lineNumber += 1
return self.reader.__iter__()
__iter__() should return self, not self.reader.__iter__(), otherwise
Python is using the actual csv.reader not your wrapper. And don't
increment line number here.
def next(self):
self.lineNumber += 1# do I need this one?
Yes.
return self.reader.next()
An easier way to do this is to use enumerate():
inputFile = file('data.csv', 'rb')
reader = csv.reader(inputFile)
for i, data in enumerate(reader):
print i, data
Of course this will not necessarily give you the true line number, as a
record may span multiple file lines and you may be processing header and
blank lines at the start of the file before you get any records. But it
is probably the best you can do and maybe it is what you need.
if __name__ == '__main__':
inputFile = file('data.csv', 'rb')
reader = MyReader(inputFile)
for data in reader:
print reader.lineNumber, data
But that doesn't seem to do what I want. If I add some print statements
to the methods, I can see that it calls __iter__ only once:
__iter__() will only be called once, it is next() that is called
multiple times.
__iter__
1 ['1', '2', '3']
1 ['2', '3', '4', '5']
1 ['3', '4', '5', '6', '7']
1 ['4', '5', '6', '7']
1 ['5', '6', '7', '8', '9']
Is there some other __special__ method that I need to forward to the
csv.reader, or have I lost all control once __iter__ has done its job?
You lost control because you gave it away.
Kent
Cheers
Duncan
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Re: [Tutor] [pygtk] ListStore question
this is cool, ill give it a shotskOn 10/27/06, euoar [EMAIL PROTECTED] wrote: euoar escribió: mc collilieux escribió: euoar wrote: I'm learning the use of liststores and treeviews. I have wrotten this litle class as exercice: # name is the name of the new column to add, values is a tuple withthe values to add def add_result (self, name, values): self.iter = self.liststore.append (values[0]) for value in values: self.liststore.insert_after(self.iter,value) rereading the tutorial, I note ...The row parameter specifies the data that should be inserted in the row after it is created ... If row is specified it must be a tuple or list containing as many items as the number of columns in the ListStore...so self.liststore.insert_after(self.iter, [value]) Hope it's the good answer... PS : sorry for the answer directly to your mail. too quickly clic That's exactly the solution. It has to be a tuple. Thank you very much for your help! __ LLama Gratis a cualquier PC del Mundo. Llamadas a fijos y móviles desde 1 céntimo por minuto. http://es.voice.yahoo.com ___ pygtk mailing list pygtk@daa.com.au http://www.daa.com.au/mailman/listinfo/pygtk Read the PyGTK FAQ: http://www.async.com.br/faq/pygtk/I think I have the solution (I'm answering myself to avoid people to waste time thinking in my question):args = [str, str, str]gtk.ListStore(*args)__LLama Gratis a cualquier PC del Mundo.Llamadas a fijos y móviles desde 1 céntimo por minuto. http://es.voice.yahoo.com___Tutor maillist-Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Getting the type of a variable
Hi I want to check the type of a variable so that I know which format to use for printing eg def print_correct_format(a): if type(a) == 'int': print a is an integer, value %i % (a) elif type(a) == 'float': print a is a float, value %f % (a) else: print a is unknown type The comparison type(a) == 'int' etc does not work - I'm sure there's a simple way to fix this but can't see it at the moment - any suggestions? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting the type of a variable
Use this: if type(a) == type(1): print a is int %d elif type(a) == type(1.1): ... HTH.. Regards, Asrarahmed Kadri On 10/27/06, Etrade Griffiths [EMAIL PROTECTED] wrote: HiI want to check the type of a variable so that I know which format to usefor printing eg def print_correct_format(a): if type(a) == 'int': print a is an integer, value %i % (a) elif type(a) == 'float': print a is a float, value %f % (a) else: print a is unknown typeThe comparison type(a) == 'int' etc does not work - I'm sure there's asimple way to fix this but can't see it at the moment - any suggestions? ___Tutor maillist-Tutor@python.orghttp://mail.python.org/mailman/listinfo/tutor -- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting the type of a variable
Thanks, guys - like so many things, easy when you know how! Alun Griffiths At 14:27 27/10/2006, you wrote: Use this: if type(a) == type(1): print a is int %d elif type(a) == type(1.1): ... HTH.. Regards, Asrarahmed Kadri On 10/27/06, Etrade Griffiths [EMAIL PROTECTED] wrote: Hi I want to check the type of a variable so that I know which format to use for printing eg def print_correct_format(a): if type(a) == 'int': print a is an integer, value %i % (a) elif type(a) == 'float': print a is a float, value %f % (a) else: print a is unknown type The comparison type(a) == 'int' etc does not work - I'm sure there's a simple way to fix this but can't see it at the moment - any suggestions? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Why is this only catching one occurance?
Chris Hengge wrote: Here is my code: for unWantedItem in directoryList: try: if hex in unWantedItem.lower(): if not bmc in unWantedItem.lower(): print unWantedItem + removed! directoryList.remove(unWantedItem) This only seems to loop through once, and removes 1 of 2 occurances from this list that should be captured. Should for keep the list going through each instance? for goes thru the list accessing item[0], item[1], item[2], etc. Let's say for is on item[1] and you remove item[1]. All the subsequent items move left, so item[2] becomes item[1], item[3] becomes item[2], etc. for then steps to item[2], skipping the original item[2]. There are several ways around this. The easiest is to process the list backwards: for unWantedItem in directoryList[,,-1]: -- Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] I am terribly confused about generators and iterators.. Help me
Asrarahmed Kadri wrote: Hi Folks, What are generators and iterators...??And why are they are needed..?? I can do my stuff with a 'for' or a 'while' loop.. so why do I need an ITERATOR..? iterators generators do not replace while or for loops! And what is a generator ..? I did try to read about these two things on the web, but still I AM CONFUSED. Well at risk of offering more web stuff, try http://heather.cs.ucdavis.edu/~matloff/Python/PyIterGen.pdf To HIM you shall return. I am glad that this thought brings you some comfort or stimulation. I used to believe something similar, and all it did was bring me fear guilt and shame. -- Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] line number when reading files using csv module
Duncan Gibson wrote:
If I have the following data file, data.csv:
1 2 3
2 3 4 5
then I can read it in Python 2.4 on linux using:
import csv
f = file('data.csv', 'rb')
reader = csv.reader(f)
for data in reader:
print data
OK, that's all well and good, but I would like to record
the line number in the file. According to the documentation,
each reader object has a public 'line_num' attribute
http://docs.python.org/lib/node265.html and
http://docs.python.org/lib/csv-examples.html supports this.
If I now change the loop to read:
for data in reader:
print reader.line_num, data
I'm presented with the error:
AttributeError: '_csv.reader' object has no attribute 'line_num'
Well I get the same exception. dir(reader) does not show line_num.
This has floored me. I've even looked at the source code and I can
see the line_num variable in the underlying _csv.c file. I can even
see the test_csv.py code that checks it!
def test_read_linenum(self):
r = csv.reader(['line,1', 'line,2', 'line,3'])
self.assertEqual(r.line_num, 0)
I suspect this is something so obvious that I just can't see the
wood for the trees and I will kick myself.
Any ideas?
Cheers
Duncan
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510-978-4454
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Re: [Tutor] I am terribly confused about generators and iterators.. Help me
Bob Gailer wrote: Asrarahmed Kadri wrote: What are generators and iterators...??And why are they are needed..?? I can do my stuff with a 'for' or a 'while' loop.. so why do I need an ITERATOR..? iterators generators do not replace while or for loops! No, actually iterators and generators are the foundation of for loops. Whenever you write a for loop, Python creates an iterator to return the values that are assigned to the loop variables. Writing your own iterator is a way to make a new kind of thing that can be iterated in a for loop. Generators are a convenient way to make iterators. They can be used to encapsulate loop logic. For some examples see these recent threads: http://thread.gmane.org/gmane.comp.python.tutor/36068/focus=36069 http://article.gmane.org/gmane.comp.python.tutor/36105/match=generator And what is a generator ..? I did try to read about these two things on the web, but still I AM CONFUSED. Well at risk of offering more web stuff, try http://heather.cs.ucdavis.edu/~matloff/Python/PyIterGen.pdf Thanks, that is very nice! Kent To HIM you shall return. I am glad that this thought brings you some comfort or stimulation. I used to believe something similar, and all it did was bring me fear guilt and shame. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] I am terribly confused about generators and iterators.. Help me
May I invite EVERYONE to NOT introduce political or religious elements into these discussions. It has no place here and can destroy this excellent discussion group. I've seen it happen. PLEASE take it elsewhere. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Gailer Sent: Friday, October 27, 2006 10:11 AM To: Asrarahmed Kadri Cc: pythontutor Subject: Re: [Tutor] I am terribly confused about generators and iterators.. Help me Asrarahmed Kadri wrote: Hi Folks, What are generators and iterators...??And why are they are needed..?? I can do my stuff with a 'for' or a 'while' loop.. so why do I need an ITERATOR..? iterators generators do not replace while or for loops! And what is a generator ..? I did try to read about these two things on the web, but still I AM CONFUSED. Well at risk of offering more web stuff, try http://heather.cs.ucdavis.edu/~matloff/Python/PyIterGen.pdf To HIM you shall return. I am glad that this thought brings you some comfort or stimulation. I used to believe something similar, and all it did was bring me fear guilt and shame. -- Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting the type of a variable
On 10/27/06, Etrade Griffiths [EMAIL PROTECTED] wrote: Hi I want to check the type of a variable so that I know which format to use for printing egAlternatively, you could just cast it as a string. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting the type of a variable
I want to check the type of a variable so that I know which format to use
for printing eg
Alternatively, you could just cast it as a string.
what joshua is saying is that for just displaying something, that it's
just as easy to convert it to a string, or, if you're using print, to
not do anything at all (since objects which are part of print
statements are automagically sent to str()), e.g.,
print a is a number with a value of, a # no need to convert a
as many others have pointed out, using type() works too, but type(x)
is type(0) works slightly faster than type(x) == type(0) ... can
any non-tutors guess why?
also, isinstance() works great if you want to do multi-compares. for
example, here's a snippet out of chapter 4 in my book:
def displayNumType(num):
print num, 'is',
if isinstance(num, (int, long, float, complex)):
print 'a number of type:', type(num).__name__
else:
print 'not a number at all!!'
displayNumType(-69)
displayNumType(99L)
displayNumType(98.6)
displayNumType(-5.2+1.9j)
displayNumType('xxx')
when you run it, you get:
-69 is a number of type: int
99 is a number of type: long
98.6 is a number of type: float
(-5.2+1.9j) is a number of type: complex
xxx is not a number at all!!
the good news is that isinstance() means only one function call, and
it's pretty fast. if there's any downside of isinstance(), and it's
pretty minor -- well, perhaps it's a feature -- is that it is *not* a
direct type/class comparison, meaning that subclasses will match too:
isinstance(1, object)
True
isinstance('xxx', object)
True
anyway, hope this helps!
-- wesley
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Core Python Programming, Prentice Hall, (c)2007,2001
http://corepython.com
wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com
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Re: [Tutor] I am terribly confused about generators and iterators.. Help me
What are generators and iterators...??And why are they are needed..?? I can do my stuff with a 'for' or a 'while' loop.. so why do I need an ITERATOR..? And what is a generator ..? I did try to read about these two things on the web, but still I AM CONFUSED. here are some more places to look in addition to what others have already posted... 1. i wrote a short article in Linux Journal back when Python 2.2 was released, highlighting its new features; it includes a discussion and examples of iterators and generators: http://www2.linuxjournal.com/article/5597 my short take on it is that iterators let you use for-loops over sequence-*like* objects. in older versions of Python, they had to *be* sequences, i.e. strings, lists, tuples. but with iterators, you can now go through lines of a file, keys of a dictionary, etc. and generators are like iterators with brains because you can generate successive items to be iterated over, in addition to the cool co-routine-like resumable function features. 2. i do Python training professionally, and for people considering my services, i offer a free 5 minute sample podcast/video of what it's like to take a course from me. the example filmed is where i discuss generators right after i introduce iterators. http://cyberwebconsulting.com (click Python Training) hope this helps! -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Core Python Programming, Prentice Hall, (c)2007,2001 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] line number when reading files using csv module
Duncan Gibson wrote: [snip] but I would like to record the line number in the file. How about using enumerate(): for line_num, data in enumerate(reader): print reader.line_num, data -- Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Why is this only catching one occurance?
Thats for this very humorous reply =DOn 10/26/06, Luke Paireepinart [EMAIL PROTECTED] wrote: Chris Hengge wrote: Here is my code: for unWantedItem in directoryList: try: if hex in unWantedItem.lower(): if not bmc in unWantedItem.lower():print unWantedItem + removed! directoryList.remove(unWantedItem) This only seems to loop through once, and removes 1 of 2 occurances from this list that should be captured. Should for keep the list going through each instance?You're removing stuff from something you're iterating over!*slaps your fingers with a ruler*Make a copy of the list!HTH,-Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Why is this only catching one occurance?
I've tried to use your example:for unWantedItem in directoryList[,,-1]:but I get an error:for unWantedItem in directoryList[,,-1]: ^SyntaxError: invalid syntax I understand what you are saying to do, and it makes sense, but I'm not sure how to impliment it. On 10/27/06, Bob Gailer [EMAIL PROTECTED] wrote:Chris Hengge wrote: Here is my code: for unWantedItem in directoryList: try: if hex in unWantedItem.lower(): if not bmc in unWantedItem.lower():print unWantedItem + removed! directoryList.remove(unWantedItem) This only seems to loop through once, and removes 1 of 2 occurances from this list that should be captured. Should for keep the list going through each instance?for goes thru the list accessing item[0], item[1], item[2], etc. Let'ssay for is on item[1] and you remove item[1]. All the subsequent itemsmove left, so item[2] becomes item[1], item[3] becomes item[2], etc. for then steps to item[2], skipping the original item[2].There are several ways around this. The easiest is to process the listbackwards: for unWantedItem in directoryList[,,-1]:--Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] line number when reading files using csv module CORRECTION
Bob Gailer wrote: Duncan Gibson wrote: [snip] but I would like to record the line number in the file. How about using enumerate(): for line_num, data in enumerate(reader): # print reader.line_num, data # SHOULD BE: print line_num, data -- Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Why is this only catching one occurance?
That was supposed to say Thanks for this but I was in a hurry.Anyways, here is my solution:# Remove any copies of .hex that aren't BMC for foundItem in directoryList: try: if .hex in foundItem.lower(): if bmc in foundItem.lower(): wantedList.append(foundItem) else: print foundItem + removed! else: wantedList.append(foundItem) except: print Failed to strip excess hex files. On 10/27/06, Chris Hengge [EMAIL PROTECTED] wrote: Thats for this very humorous reply =DOn 10/26/06, Luke Paireepinart [EMAIL PROTECTED] wrote: Chris Hengge wrote: Here is my code: for unWantedItem in directoryList: try: if hex in unWantedItem.lower(): if not bmc in unWantedItem.lower():print unWantedItem + removed! directoryList.remove(unWantedItem) This only seems to loop through once, and removes 1 of 2 occurances from this list that should be captured. Should for keep the list going through each instance?You're removing stuff from something you're iterating over!*slaps your fingers with a ruler*Make a copy of the list!HTH,-Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Why is this only catching one occurance?
Chris: See below. -Original Message- Message: 7 Date: Fri, 27 Oct 2006 12:20:51 -0700 From: Chris Hengge [EMAIL PROTECTED] Subject: Re: [Tutor] Why is this only catching one occurance? To: Bob Gailer [EMAIL PROTECTED] Cc: Tutor tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=iso-8859-1 I've tried to use your example: for unWantedItem in directoryList[,,-1]: but I get an error: for unWantedItem in directoryList[,,-1]: ^ SyntaxError: invalid syntax SNIP The problem is the commas. Python uses colons to describe slices. Try this instead: for unWantedItem in directoryList[::-1]: I think that will work for you. Regards, Barry [EMAIL PROTECTED] 541-302-1107 We who cut mere stones must always be envisioning cathedrals. -Quarry worker's creed ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] XML parsing in Python.. resources needed
On Fri, Oct 27, 2006 at 11:24:00AM +0100, Asrarahmed Kadri wrote: Hi Folks, ANy comments about ELementTree module... I have heard that it is more 'Pythonic'... I need some basic examples to start learning the stuff.. If anyone has got the information, please pass it along.. ElementTree is great, and will be in Python2.5, so it's good to know. Go through the documentation at http://effbot.org/zone/element.htm, as Kent mentioned, and return to the list with specific questions. I recommend you also take a look at Amara[1], which I enjoy using because of it's clear API and clean output. gabe [1] http://uche.ogbuji.net/tech/4suite/amara/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] (OT) Non-Python discussions (Was: I am terribly confused about generators ...)
Greetings: I agree completely with David. There are plenty of places to discuss controvercial topics. Let's not do it here, where it will only disrupt, and possibly ruin, an exceptionally useful teaching and learning channel. Regards, Barry [EMAIL PROTECTED] 541-302-1107 We who cut mere stones must always be envisioning cathedrals. -Quarry worker's creed -Original Message- Message: 1 Date: Fri, 27 Oct 2006 10:41:51 -0600 From: David Heiser [EMAIL PROTECTED] Subject: Re: [Tutor] I am terribly confused about generators and iterators.. Help me To: pythontutor tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=us-ascii May I invite EVERYONE to NOT introduce political or religious elements into these discussions. It has no place here and can destroy this excellent discussion group. I've seen it happen. PLEASE take it elsewhere. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Gailer Sent: Friday, October 27, 2006 10:11 AM To: Asrarahmed Kadri Cc: pythontutor Subject: Re: [Tutor] I am terribly confused about generators and iterators.. Help me Asrarahmed Kadri wrote: Hi Folks, snip To HIM you shall return. I am glad that this thought brings you some comfort or stimulation. I used to believe something similar, and all it did was bring me fear guilt and shame. -- Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] recommendations for database module based on my needs
I'm hoping to create an app which takes user data via a GUI with checkboxes, textcontrols, spinner controls, etc. The data would be some text, some numbers, some checkboxes checked or not, etc. I've been making a little progress on that via wxPython and Boa Constructor. Now I want to save that info such that: - the user can later search for any piece of data (search by date entered, for example). - the non-text data can be plotted on a chart and simple line regression, etc., applied to it. this could be some variable over time line graph or one variable vs. another scatterplot. The plotting I will pursue at another time, possibly via MatPlotLib or something. But as for databases, I've heard a few choices, including gadfly or SQL and others. I know zero about this, but I've heard gadfly is good if it is just a small dataset. But how small is small? The app I'm thinking of would take maybe 10-20 numbers/day and a few textboxes worth for potentially years. Or should I just pony up to SQL or some other option that I don't know about? Any recommendations or small python projects which are like this I might want to check out? thanks. _ Try the next generation of search with Windows Live Search today! http://imagine-windowslive.com/minisites/searchlaunch/?locale=en-ussource=hmtagline ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting the type of a variable
Etrade Griffiths [EMAIL PROTECTED] wrote I want to check the type of a variable so that I know which format to use for printing eg That's sometimes necessary but you may find that just using %s will suffice. print %s\n % 42 print %s\n % 42 print %s\n % 42.0 You usually only need to check the type if the format string includes type specific precision and justification characters. but the %s format will work for most types most of the time. The comparison type(a) == 'int' etc does not work type(a) == type(1) HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] recommendations for database module based on my needs
Pine Marten [EMAIL PROTECTED] wrote it is just a small dataset. But how small is small? A potentially big topic. But heres my purely arbitrary guidelines: Less than 1000 records use a text file (or maybe XML) 1,000 - 100,000 records consider an in memory database or something like gdm (or gadfly in this case) 100,000=1000,000 records small scale or industrial SQL Access, or SqlLite would be good examples over 1,000,000 records go industrial. Postgres, MySql, Firebird/Interbase, Oracle, DB2, Sql server etc There are lots of other issues to consider too, like numbers of tables, indexes, need for stored procedures etc etc. But for simple data storage those rough guidelines should suffice. Caveat: Hardware improvements are changing the rules all the time. If its only simple one-off lookup, a text file could be used for 1,000,000 records on a fast machine nowadays, and if your server has 16G RAM say, then an in-memory database may scale up much farther. My figures assume long term multiple access during the application and average PC hardware. And all IMHO of course :-) -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] database question
For example with SELECT * FROM a, I use this code ... to know how many columns are in the result, As a general rule its better to avoid Select * From in production SQL. If the table definition changes the data returned can change in unexpected ways and break your application. In addition you can wind up sucking up an awful lot of unnecessary data (think bandwidth and server throughput). Its much safer to explicitly list all of the columns you want to pull back if at all possible. -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] basic question ...
Hi,How does one figure all the builtin libraries/ classes that python supports?For example if I want to sort a list of names, I would normally think of implementing the sorting routine in C. I am just beginning to learn python. It looks like there is a rich set available builtin libraries. So, is there one place where I can look to figure out I dont have to write afresh. thanks,Ravi. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] basic question ...
Ravi Kondamuru wrote: Hi, How does one figure all the builtin libraries/ classes that python supports? For example if I want to sort a list of names, I would normally think of implementing the sorting routine in C. I am just beginning to learn python. It looks like there is a rich set available builtin libraries. So, is there one place where I can look to figure out I dont have to write afresh. thanks, Ravi. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor A good way to start is the dir() method which will show what is available to an object mylist = [] dir(mylist) ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__delslice__', '__doc__', '__eq__', '__ge__', '__getattribute__', '__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__str__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort'] myString = '' dir(myString) ['__add__', '__class__', '__contains__', '__delattr__', '__doc__', '__eq__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__getslice__', '__gt__', '__hash__', '__init__', '__le__', '__len__', '__lt__', '__mod__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmod__', '__rmul__', '__setattr__', '__str__', 'capitalize', 'center', 'count', 'decode', 'encode', 'endswith', 'expandtabs', 'find', 'index', 'isalnum', 'isalpha', 'isdigit', 'islower', 'isspace', 'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'replace', 'rfind', 'rindex', 'rjust', 'rstrip', 'split', 'splitlines', 'startswith', 'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill'] also, try the builtin help in the interpreter help(mylist.sort) Help on built-in function sort: sort(...) L.sort(cmpfunc=None) -- stable sort *IN PLACE*; cmpfunc(x, y) - -1, 0, 1 Good Luck, Glenn -- Ketchup. For the good times... - Ketchup Advisory Board Glenn Norton Application Developer Nebraska.gov 1-402-471-2777 [EMAIL PROTECTED] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] basic question ...
On Fri, 27 Oct 2006, Ravi Kondamuru wrote: How does one figure all the builtin libraries/ classes that python supports? For example if I want to sort a list of names, I would normally think of implementing the sorting routine in C. I am just beginning to learn python. It looks like there is a rich set available builtin libraries. So, is there one place where I can look to figure out I dont have to write afresh. Hi Ravi, As with any reference material, it's a good idea to try the index of the relevant documentation. You might not always find what you're looking for, but it can be effective. In this particular case, you've guessed that there might be something in the Library that might help you. If you search for sort in the Library Reference: http://www.python.org/doc/lib/genindex.html You should see an index entry labeled sort() (list method). Looking up that index entry should bring you to a page describing the methods on lists: http://www.python.org/doc/lib/typesseq-mutable.html So looking at the reference is useful if you already know what you're looking for. In this case, yes, there is a built-in sort. Even better, there's a dedicated guide to using Python's sort functionality: http://wiki.python.org/moin/HowTo/Sorting If you want to get an overview of the extent of Python's library, try the table of contents: http://www.python.org/doc/lib/ There's a heck of a lot of stuff there, so asking someone to memorize it is ridiculous. Still, it can help to scan through it sometimes to get a better idea of what services the Library provides. I've often been amazed at the gems in there. (bisect? Wow, I don't have to code my own binary search anymore!) Another good way to learn the library is to look at what libraries other people use: you can read other people's code. For example, the Python Cookbook provides a good source of programs that you can browse: http://aspn.activestate.com/ASPN/Python/Cookbook/ Finally, well, ask other people. You've done so on Tutor, so that's a good start. Many of us are happy to act as librarians to point you in some direction, and we usually aim not to mislead. *grin* ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem importing class
It looks like people have identified the problem, that your site.py module isn't being found because it conflicts with something from Python's Standard Library. This isn't the first time this kind of problem has hit people. This problem is well known and is the subject of a Python Enhancement Proposal (PEP 328). If you're using Python 2.5, you can use a new feature called 'absolute_import' to avoid the import problem. See: http://docs.python.org/whatsnew/pep-328.html for more details. Hmm, I don't see how that would help since AFAICT shawn's site.py is not in a package. Or maybe I don't understand what you are suggesting? Hi Kent, I don't think I replied back to you on this one! Python loads up 'site.py' on startup if called without the '-S' option: http://docs.python.org/lib/module-site.html So imagine if we're a program, and we run Python on it. For some reason --- at least on startup --- Python places precendence on the modules located in Python's library directory. So we pick up the Standard Library's site.py, which is then cached in sys.modules like any other module import. Later on, if we try to 'import site', Python reuses the already-loaded site.py (because it's already cached in sys.modules) , regardless if there's a 'site.py' module in the current working directory. The reason PEP 328 can be a solution here is because, if the absolute_import feature were on, we'd be able to do: from . import site which would pick up the correct relative path. Concretely, here's what probably happened with the original poster: ## mumak:~ dyoo$ echo print 'hi' site.py mumak:~ dyoo$ python Python 2.3.5 (#1, Mar 20 2005, 20:38:20) [GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin Type help, copyright, credits or license for more information. import site print site.__file__ /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site.pyc ### Note that the 'site.py' in the current directory was not used. I have no idea why. I suspect that this has some relation to the way that site.py is handled by a special case in the Python interpreter, but I have really no clue. Python's module import lookup was handled in an implicit way which goes against its traditional explicit instead of implicit philosophy. That's why PEP 328 is so critically important: the name-collision problem gets much worse as either Standard Library or our own programs grow. I'm amazed that we've been able to tolerate this situation for so long. *grin* ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
