File Creation Not Working In A Thread Class?

bc90021 <py****@bc90021 .netwrites:

Hi All,

Thanks in advance for any and all help!

I have this code:

g = open(fileName, 'a')

where fileName is defined before the line it's used in. It works fine
when I use it outside a thread class.

When I put the same line in a thread class, it no longer works, and I get
an error:

IOError: [Errno 2] no such file u'fileName'

It's telling you that you haven't got a file called 'fileName'.
Posting the code that triggers this error would allow people to
diagnose the error accurately rather than guessing.

--
Arnaud

bc90021 wrote:

Hi All,

Thanks in advance for any and all help!

I have this code:

g = open(fileName, 'a')

I don't believe you. I think you have something like

g = open('fileName' , 'a')

instead of (as you claim)

g = open(fileName, 'a')

Do you see the difference?

Develop the skill of reading the error messages *very* carefully. Your error says there is no file named "fileName", and if you think about what's on your disk, I'll bet you won't find a file whose name is "fileName".
Gary Herron

where fileName is defined before the line it's used in. It works fine
when I use it outside a thread class.

When I put the same line in a thread class, it no longer works, and I get
an error:

IOError: [Errno 2] no such file u'fileName'

Are threads not allowed to create files?
--
http://mail.python.org/mailman/listinfo/python-list

7stud <bb**********@y ahoo.comwrote:

>* * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * tempfileName = "\"proctemp \\" +
self.matrix[c][0] + "_other.txt \""

It wouldn't exactly result in either of the error messages you posted, but
I expect the spurious quote marks round the filename will be giving you
problems.

Surely you want the filename to be something like 'proctemp\fred_ other.txt'
rather than '"proctemp\fred _other.txt"' with the spurious double quotes?

On May 11, 1:28*pm, bc90021 <pyt...@bc90021 .netwrote:

...and the exact error message was?

Here is a tip: if you want people to help you, then you have to help
them to help you. *Personally, I wouldn't respond to anymore of your
questions because you seem incapable of posting the information that was
requested.

So far, the people who have answered this post have gone on the
assumption that I'm stupid. *I'm not. *I took perfectly working code,
cut it from one class, and put it in another. *It stopped working in the
second class. *I've spent days on this and trust me, given what I've
experienced of the Python community so far, if I didn't have to ask, I
wouldn't.

(I really must say that so far the help I am getting in the Python
community is a big let down. *Whether it's on IRC or here, everyone has
an arrogance that I don't find anywhere else in the open source
community, and it seriously makes me question the choice of language that
I've made.)

The error message was at the top of the thread (am I incapable of posting
it, or are you incapable of following a thread?), but here it is again:

IOError: [Errno 2] no such file u'tempfileName'

Well, it appears to me that this error message is different than the
one in your first post. But maybe I'm on LSD right now and things
will be appear differently tomorrow.

In addition, I've never seen a python error message that doesn't
include the traceback, which you were asked to post, but apparently
are still incapbable of doing. Also, any line numbers in the error
message should be marked in your code with comments. That will help
other people help you, remember?

On May 11, 2:01*pm, 7stud <bbxx789_0...@y ahoo.comwrote:

On May 11, 1:28*pm, bc90021 <pyt...@bc90021 .netwrote:

...and the exact error message was?

Here is a tip: if you want people to help you, then you have to help
them to help you. *Personally, I wouldn't respond to anymore of your
questions because you seem incapable of posting the information that was
requested.

So far, the people who have answered this post have gone on the
assumption that I'm stupid. *I'm not. *I took perfectly working code,
cut it from one class, and put it in another. *It stopped working in the
second class. *I've spent days on this and trust me, given what I've
experienced of the Python community so far, if I didn't have to ask, I
wouldn't.

(I really must say that so far the help I am getting in the Python
community is a big let down. *Whether it's on IRC or here, everyone has
an arrogance that I don't find anywhere else in the open source
community, and it seriously makes me question the choice of language that
I've made.)

The error message was at the top of the thread (am I incapable of posting
it, or are you incapable of following a thread?), but here it is again:

IOError: [Errno 2] no such file u'tempfileName'

Well, it appears to me that this error message is different than the
one in your first post. *But maybe I'm on LSD right now and things
will be appear differently tomorrow.

In addition, I've never seen a python error message that doesn't
include the traceback, which you were asked to post, but apparently
are still incapbable of doing. *Also, any line numbers in the error
message should be marked in your code with comments. *That will help
other people help you, remember?

In addition, posting the exact output from this:

>print "We're in copying, and tempfileName is: %s...\n" % tempfileName
#The above line correctly prints the temporary file name every time!
The directory exists, too!

would be helpful.

In addition, reducing your code to a simple 10 line example that
produces the same problem and that anyone can run would be helpful.
You might find that making the effort to produce a simple 10 line
example that mimics the problem, will actually result in your solving
the problem yourself.

[CUT]

I have in no way assumed that you are stupid. I have tried to help you
formulate your problem better so that people on the list can help you.
I believe I have done so respectfully, with the aim of introducing you
to the modus operandi of this group.

I appreciate your help. However, the comments I got from other people
that "I'm sure you have quotes here..." type comments are incredibly
insulting. To tell someone that you're sure that they have quotes around
something when they don't is the height of arrogance and rudeness.

>(I really must say that so far the help I am getting in the Python
community is a big let down. Whether it's on IRC or here, everyone has
an arrogance that I don't find anywhere else in the open source
community, and it seriously makes me question the choice of language
that I've made.)

Don't judge too quickly. I think this newsgroup is on the whole
extremely helpful. I have learnt a lot from it. But you have to get
used to its ways, and until you are familiar with them, approach it with
humility.

Unfortunately, this is not my first interaction with the Python IRC
communities or Python newsgroups. I had tried working with this language
a while back (around 2000) and the answers I got were unhelpful and
usually rude. I decided to give it another shot for the program I'm
writing, and I'm regretting that. It's possible that I'm to blame - I'm
the common factor in both instances, but at the same time, when you ask a
question in #python and NO ONE ANSWERS at all, and they all just sit
there not talking at all, what's the point of having the IRC channel? If
newbies can't go there for help, what's the point? When there are 70
people in a channel, and no one even acknowledges your question has been
asked, where does one go for help? It's like talking to yourself.

>The error message was at the top of the thread (am I incapable of
posting it, or are you incapable of following a thread?), but here it
is again:

IOError: [Errno 2] no such file u'tempfileName'

This is different from the error message that you posted in your
original message.

Anyway, what is useful to us is a full traceback, no just an error
message.

It is not "different" except that I posted the full name the second
time. (tempfileName instead of the previously simplified fileName) The
code itself is actually irrelevant, in my humble opinion. In one place a
file creation line does not work; in the second place it does. How can
the same line of code do two different things in two places? Either it
creates a file or it doesn't. It should create the file in either place,
regardless of where it's being called.

Either way, I figured it out.

On Sun, 11 May 2008 19:55:31 +0000, Duncan Booth wrote:

7stud <bb**********@y ahoo.comwrote:

>Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* tempfileName = "\"proctemp \\"
Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* +
self.matrix[c][0] + "_other.txt \""

It wouldn't exactly result in either of the error messages you posted,
but I expect the spurious quote marks round the filename will be giving
you problems.

Surely you want the filename to be something like
'proctemp\fred_ other.txt' rather than '"proctemp\fred _other.txt"' with
the spurious double quotes?

Yup, that's what it was. I figured it out two seconds before this post.
However, it will be interesting to see how it handles files with spaces
in the name...

Thanks for your help!

bc90021 <py****@bc90021 .netwrites:

The error message was at the top of the thread (am I incapable of posting
it, or are you incapable of following a thread?), but here it is again:

IOError: [Errno 2] no such file u'tempfileName'

Typically, when you report an error message, it helps to paste the
whole traceback. For example, it may be that you are seeing an error
from an old version of the file that has quotes around tempfileName,
or the error is coming from somewhere else.

But to answer your original question: no, there are no problems with
threading and files, and this is just simple human mistake somewhere.

On May 11, 2:11*pm, bc90021 <pyt...@bc90021 .netwrote:

[CUT]

I have in no way assumed that you are stupid. *I have tried to help you
formulate your problem better so that people on the list can help you.
I believe I have done so respectfully, with the aim of introducing you
to the modus operandi of this group.

I appreciate your help. *However, the comments I got from other people
that "I'm sure you have quotes here..." type comments are incredibly
insulting. *To tell someone that you're sure that they have quotes around
something when they don't is the height of arrogance and rudeness.

The best way to get help is to post a simple example that demonstrates
your problem and that anyone can run and get the same error you are
getting. That means you need take your real code and you start
hacking out the bits that are irrelevant to the problem. With
judicious use of print statements you should be able to narrow the
problem down.

Your first post was about as far away from that as it could be. Your
first post was essentially equivalent to asking:

Why does this line:

>print name

>display "Jack" and not "Jill".

When you post a question like that, then you are either going to be
met with silence or people will attempt to debug your imaginary code
and guess at the problem, which sometimes works and sometimes
doesn't. If you find the guesses insulting, then post a better model
of your problem. The fact that you found these guesses insulting,
even though they were respectfully given and they were the obvious
answers in light of how little information you gave, means you are
probably going to have problems on any newsgroup you post to.

The python community has some real jerks in it, but you didn't meet
any of them in this thread.

(I really must say that so far the help I am getting in the Python
community is a big let down. *Whether it's on IRC or here, everyone has
an arrogance that I don't find anywhere else in the open source
community, and it seriously makes me question the choice of language
that I've made.)

Don't judge too quickly. *I think this newsgroup is on the whole
extremely helpful. *I have learnt a lot from it. *But you have to get
used to its ways, and until you are familiar with them, approach it with
humility.

Unfortunately, this is not my first interaction with the Python IRC
communities or Python newsgroups. *I had tried working with this language
a while back (around 2000) and the answers I got were unhelpful and
usually rude. *I decided to give it another shot for the program I'm
writing, and I'm regretting that. *It's possible that I'm to blame - I'm
the common factor in both instances, but at the same time, when you ask a
question in #python and NO ONE ANSWERS at all, and they all just sit
there not talking at all, what's the point of having the IRC channel? *If
newbies can't go there for help, what's the point? *When there are 70
people in a channel, and no one even acknowledges your question has been
asked, where does one go for help? *It's like talking to yourself.

The error message was at the top of the thread (am I incapable of
posting it, or are you incapable of following a thread?), but here it
is again:

IOError: [Errno 2] no such file u'tempfileName'

This is different from the error message that you posted in your
original message.

Anyway, what is useful to us is a full traceback, no just an error
message.

It is not "different" except that I posted the full name the second
time. *(tempfileName instead of the previously simplified fileName) *The
code itself is actually irrelevant, in my humble opinion. *In one place a
file creation line does not work; in the second place it does. *How can
the same line of code do two different things in two places? *Either it
creates a file or it doesn't. *It should create the file in either place,
regardless of where it's being called.

Either way, I figured it out.

bc90021 wrote:

>...and the exact error message was?

Here is a tip: if you want people to help you, then you have to help
them to help you. Personally, I wouldn't respond to anymore of your
questions because you seem incapable of posting the information that was
requested.

So far, the people who have answered this post have gone on the
assumption that I'm stupid. I'm not. I took perfectly working code,
cut it from one class, and put it in another. It stopped working in the
second class. I've spent days on this and trust me, given what I've
experienced of the Python community so far, if I didn't have to ask, I
wouldn't.

(I really must say that so far the help I am getting in the Python
community is a big let down. Whether it's on IRC or here, everyone has
an arrogance that I don't find anywhere else in the open source
community, and it seriously makes me question the choice of language that
I've made.)

Sorry, the arrogance is yours.

Expecting us to help with only partial information.

Expecting us to help when your posts of the error message changes
from one post to the next.

Expecting us to help when you refuse to post the traceback.

Expecting us to believe that it has anything to do with threads.
(No one believes that for a moment.)
While acknowledging that any piece of code may have bugs, Python's
threading included, the problem here looks to be some simple mistake in
the computation of the name of the file to be opened. Then I look at
the convoluted quoting surrounding your computation of the file name,
and my confidence in that as an explanation sky-rockets. Then someone
in another post has found an extra set of quotes embedded in your
filename you compute, and it's clear that we are on the right track.

The error message was at the top of the thread (am I incapable of posting
it, or are you incapable of following a thread?), but here it is again:

IOError: [Errno 2] no such file u'tempfileName'

--
http://mail.python.org/mailman/listinfo/python-list