Been reading the docs saying that file should replace open in our code, but this
doesn't seem to work:
# Open file for writing, write something, close file
MyFile = file("MyFile.tx t", "w")
MyFile.write("T his is a test.")
MyFile.close()
However, using:
MyFile = open("MyFile.tx t", "w")
MyFile.write("T his is a test.")
MyFile.close()
I have no problems.
I'm sure that I'm missing something here about using open vs file, but am not
sure what. Probably just mis-read something. If anyone can point me to what I
didn't quite get, I'd appreciate the information.
Thanks.
-Pete 8 1791
Peter A. Schott wrote: Been reading the docs saying that file should replace open in our code, but this doesn't seem to work:
This was really a misstatement; open is still preferred. file is now
a built in class, and its constructor is the same as open. I think the
current docs have been fixed.
# Open file for writing, write something, close file MyFile = file("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close()
But you've given us no idea what went wrong.
However, using: MyFile = open("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close()
I cannot help you if you don't tell me what went wrong.
Both bits of code seem to do the same thing for me.
--Scott David Daniels Sc***********@A cm.Org
In article <6a************ *************** *****@4ax.com>,
Peter A. Schott <pa******@no.ya hoo.spamm.com> wrote: Been reading the docs saying that file should replace open in our code, but this doesn't seem to work:
# Open file for writing, write something, close file MyFile = file("MyFile.tx t", "w") MyFile.write(" This is a test.") MyFile.close ()
This should work in a sufficiently recent version of python (I'm hedging
because I don't recall when file was introduced -- python 2.2? 2.3?).
What version are you using? What error do you see?
-- Russell
Both your code snippets above work should work OK. If it seems like a
file isn't being written, maybe you should specify its full path so you
are sure about where to check for it.
On the file-or-open question, the Python docs state, "The intent is for
open() to continue to be preferred for use as a factory function which
returns a new file object."
I happen to know that because it was clarified for me recently by a few
posters in this informative thread: http://groups.google.com/group/comp....c7fbacf0866763
(which didn't start out as a file-or-open discussion, but there you
go).
Hope this helps,
Jason
Peter A.Schott wrote: Been reading the docs saying that file should replace open in our code, but this doesn't seem to work:
# Open file for writing, write something, close file MyFile = file("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close()
However, using: MyFile = open("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close()
I have no problems.
I'm sure that I'm missing something here about using open vs file, but am not sure what. Probably just mis-read something. If anyone can point me to what I didn't quite get, I'd appreciate the information.
Thanks.
-Pete
I can only assume you are using an older version of Python:
$ python
Python 2.4.1 (#1, May 27 2005, 18:02:40)
[GCC 3.3.3 (cygwin special)] on cygwin
Type "help", "copyright" , "credits" or "license" for more information. open is file
True
regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC http://www.holdenweb.com/
Peter A.Schott wrote: Been reading the docs saying that file should replace open in our code, but this doesn't seem to work:
what docs?
"open" is the preferred way to open a file. "file" is a type constructor.
in contemporary python, they happen to map to the same callable, but
that's not necessarily something that will also apply to future releases.
see: http://mail.python.org/pipermail/pyt...ly/045921.html http://mail.python.org/pipermail/pyt...ly/045967.html
# Open file for writing, write something, close file MyFile = file("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close()
instead of saying that something "doesn't seem to work", it's always
more helpful to explain what happens. do you get a traceback? what
does the traceback say?
However, using: MyFile = open("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close()
I have no problems.
</F>
I'll have to try this again. I obviously did something wrong in my code. I was
getting errors about not being able to write a string because it wasn't
supported. It was driving me nuts for a while until I just gave up and went
back to open(). I'll do some more playing and if I continue to get errors, I'll
post the code I'm using at the time along with any errors I got.
I apologize for not including the details. A thread I was reading reminded me
about that odd behaviour from a couple of weeks ago and I wanted to see if I was
way off base as I could consistently reproduce it then on Python 2.4.1.
Thanks to all who replied. If open is still preferred, I will stick with that.
:-)
-Pete
Scott David Daniels <Sc***********@ Acm.Org> wrote: Peter A. Schott wrote: Been reading the docs saying that file should replace open in our code, but this doesn't seem to work: This was really a misstatement; open is still preferred. file is now a built in class, and its constructor is the same as open. I think the current docs have been fixed.
# Open file for writing, write something, close file MyFile = file("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close() But you've given us no idea what went wrong.
However, using: MyFile = open("MyFile.tx t", "w") MyFile.write("T his is a test.") MyFile.close() I cannot help you if you don't tell me what went wrong.
Both bits of code seem to do the same thing for me.
--Scott David Daniels Sc***********@A cm.Org
Peter A. Schott wrote: I'll have to try this again. I obviously did something wrong in my code. I was getting errors about not being able to write a string because it wasn't supported. It was driving me nuts for a while until I just gave up and went back to open().
I expect somewhere previously in the same frame (perhaps the
interpreter top level) you had done either "file = open(...)"
or "file = file(...)" which would prevent you from getting to the
file in __builtins__.
--Scott David Daniels Sc***********@A cm.Org
Peter A. Schott wrote: Thanks to all who replied. If open is still preferred, I will stick with that.
FWIW, that's not an unqualified "preferred" . To demonstrate by example,
neither of the above is considered preferred, though they both work:
outputFile = file('path.to.f ile')
if isinstance(outp utFile, open): ...
whereas these _are_ preferred:
outputFile = open('path.to.f ile')
if isinstance(outp utFile, file): ...
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