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I am using Windows 7.
I am trying make a file called PRN.csv. But get a "The specified device name is invalid" error.
I can make a file called PR.csv or PRN_.csv.
What is so special about PRN.csv?
N.B. I discovered the problem while using Pandas / Python to save a dataframe to csv. So it is relevant to this site. Apologies for not making it clear at the beginning.
This is a holdover from the DOS days. There are a number of special file names that are reserved, such as PRN (referring to the default printer), CON (the console), COM1–COM4, etc.
This is purely a backwards-compatible effort in the upper layers of the system, though. If you use the right APIs, you can create such a file because the file system doesn't care at all:
This was created in Far Manager which bypasses a few of such restrictions.
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I work in insurance as an actuary, and one thing we deal with is models, it usually involve bunch of input tables, then a calculation or projection process to produce certain output in interests.
It is usually more complex then usual excel reports you see in business world.
Now given the fast calc speed & effienciency in oher programming platform (C#, python, C++, Julia...etc)
I really want to use other platform to either
replicate the certain computational intensive process which usually takes 2-3 hrs as it go back and forth between bunch of excel sheets and doing an iterative process and find the solution
call or control the excel process
I understand python can control for part 2 using openpyxl , but for 1. which are the easiest to replicate with? here i meant easy to convert.
thanks many~
i am playing around python but did not expect can replicate the complex iteration process easily
This question will almost certainly get closed as StackOverflow does not allow asking for recommended software.
There's an active actuary group in Julia, their website is here:
https://juliaactuary.org/
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I am about to distribute an app, and I am creating an installer. I know that apps in windows go to C:\Program Files but I am also aware that the folder changes its name depending on the language, for example, in spanish it is C:\Archivos de Programa
This is quite tricky because I do not want to have to detect the language of windows and then having to create a different variable for each path in a different language. Is there any way I can get the name of that folder from python so I can just use that to create a single path?
Use the PROGRAMFILES environment variable:
>>> from os import environ
>>> environ['PROGRAMFILES']
'C:\Archivos de Programa'
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If not, is there any function to flush the butter of fileIO?
Certainly this is possible from a technical point of view:
You need some sort of volume server for this. Typically used are either nfs or samba for such task, though many other options exist. You can use these to "export" the volume for usage by other systems. This also means, that you need to attach that "portable disk" (probably some sort of USB volume) to some local system where such software is installed and executed on.
However there is one issue here: the remote, importing (so mounting) system must be able to reach the exporting system on the network. So the exporting system must be visible on the network or even internet. This certainly is possible, but might require a little more effort if you do not have a static, routeable ip address for the exporting system. In such cases this is not really a good idea, since the reliability of the whole setup is questionable.
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I was editing a .py file and I had saved it. The power cable was then pulled out of the pi, about 30 seconds after. When I restarted the pi, the file was still there, but the contents was empty (0 bytes). Is there a way to recover this file?
in linux if you used GEdit and you havent disabled the backup function, then there must be a hidden file with name similar to your file but with ~ appended to it. So if your file name is somefile.txt then look for somefile.txt~ in the same directory. This is the backup file and will give you your files state before last save.
also in linux this is a question like this that had been answered ! https://askubuntu.com/questions/50678/how-i-can-recover-a-previous-version-of-a-file
and for windows you can see this : https://superuser.com/questions/515906/is-there-any-way-to-restore-recover-a-file-that-was-saved-over-to-its-last-versi
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Closed 9 years ago.
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Psycopg is the most popular PostgreSQL adapter for the Python programming language.
The name Psycopg does not make sense to me.
I understand the last pg means Postgres, but what about Psyco?
I've always thought of it as psycho-Postgres.