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which is the right file path format in python3.4 ?

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  which is the right  file path format in python3.4 ? sir <elearn2014@gmail.com> - 2014-12-14 17:05 +0800
    Re: which is the right  file path format in python3.4 ? Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2014-12-14 10:52 +0100
    Re: which is the right  file path format in python3.4 ? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-14 22:03 +1100
      Re: which is the right file path format in python3.4 ? Chris Angelico <rosuav@gmail.com> - 2014-12-14 22:09 +1100
        Re: which is the right file path format in python3.4 ? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-14 22:51 +1100
          Re: which is the right file path format in python3.4 ? Chris Angelico <rosuav@gmail.com> - 2014-12-14 23:13 +1100

#82495 — which is the right file path format in python3.4 ?

My system is :win7+python3.4  .

I want to write a new file "named names.txt"  in disk f:

  >>> ff=open(r"F:\names.txt","w")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
OSError: [Errno 22] Invalid argument: 'F:\\names.txt'
 >>> ff=open(r"F:/names.txt","w")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
OSError: [Errno 22] Invalid argument: 'F:/names.txt'
 >>> ff=open(r"F://names.txt","w")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
OSError: [Errno 22] Invalid argument: 'F://names.txt'
 >>> ff=open(r"f://names.txt","w")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
OSError: [Errno 22] Invalid argument: 'f://names.txt'
 >>> ff=open(r"f:/names.txt","w")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
OSError: [Errno 22] Invalid argument: 'f:/names.txt'

which is the right  file path format in python3.4 ?

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#82496

On 14-12-2014 10:05, sir wrote:
> My system is :win7+python3.4  .
> 
> I want to write a new file "named names.txt"  in disk f:
> 
>  >>> ff=open(r"F:\names.txt","w")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> OSError: [Errno 22] Invalid argument: 'F:\\names.txt'
>>>> ff=open(r"F:/names.txt","w")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> OSError: [Errno 22] Invalid argument: 'F:/names.txt'
>>>> ff=open(r"F://names.txt","w")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> OSError: [Errno 22] Invalid argument: 'F://names.txt'
>>>> ff=open(r"f://names.txt","w")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> OSError: [Errno 22] Invalid argument: 'f://names.txt'
>>>> ff=open(r"f:/names.txt","w")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> OSError: [Errno 22] Invalid argument: 'f:/names.txt'
> 
> which is the right  file path format in python3.4 ?

They all should work. (They do on my machine when subtituting F with a drive letter that
exists here. Win 7, Python 3.4.2).

It's something else on your end that is causing the error. Is drive F: full? Do you have
the correct permissions? Is it a network share that has certain restrictions?
What exact python is is that you are running?


Irmen

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#82497

sir wrote:

> My system is :win7+python3.4  .
> 
> I want to write a new file "named names.txt"  in disk f:
> 
>   >>> ff=open(r"F:\names.txt","w")
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> OSError: [Errno 22] Invalid argument: 'F:\\names.txt'

Are you sure that you have an F drive?

Is it a writable disk? e.g. a hard drive, not a CD drive.

Do you have read and write permissions to F drive?


Run this code and show us what it prints:

import os
print(os.stat("F:\\")
print(os.access("F:\\", os.O_RDWR))




-- 
Steven

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#82498 — Re: which is the right file path format in python3.4 ?

On Sun, Dec 14, 2014 at 10:03 PM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> Run this code and show us what it prints:
>
> import os
> print(os.stat("F:\\")
> print(os.access("F:\\", os.O_RDWR))

(With an extra close parenthesis on the first print call)

I'm suspicious here that drive F might not even exist. I would expect
a permissions error to be errno 13, but "invalid argument" seems
really weird. Definitely these checks will be informative.

ChrisA

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#82499 — Re: which is the right file path format in python3.4 ?

Chris Angelico wrote:

> On Sun, Dec 14, 2014 at 10:03 PM, Steven D'Aprano
> <steve+comp.lang.python@pearwood.info> wrote:
>> Run this code and show us what it prints:
>>
>> import os
>> print(os.stat("F:\\")
>> print(os.access("F:\\", os.O_RDWR))
> 
> (With an extra close parenthesis on the first print call)

Thanks.

 
> I'm suspicious here that drive F might not even exist. I would expect
> a permissions error to be errno 13, but "invalid argument" seems
> really weird. Definitely these checks will be informative.

I don't have access to a Windows box to check, otherwise I would do it
myself. What happens if you specify a non-existent drive letter?

open("Q:\\xxx")  # Assuming you don't have a drive Q.




-- 
Steven

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#82500 — Re: which is the right file path format in python3.4 ?

On Sun, Dec 14, 2014 at 10:51 PM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> I don't have access to a Windows box to check, otherwise I would do it
> myself. What happens if you specify a non-existent drive letter?
>
> open("Q:\\xxx")  # Assuming you don't have a drive Q.

Hmm. I just grabbed one (granted, it's XP not W7) and checked it, and
it's not what I was expecting either.

Python 3.4.0 (v3.4.0:04f714765c13, Mar 16 2014, 19:24:06) [MSC v.1600
32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> open("Q:\\xxx")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: 'Q:\\xxx'

Still, it might be something unusual about the OP's drive. Maybe a
network drive with a broken connection, or a mounted CD, or an alias
for another directory... who knows. Hopefully the stat and access
checks will reveal something.

ChrisA

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