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Full Discussion: Read .xlsx and text files in a loop using openpyxl
Top Forums Programming Read .xlsx and text files in a loop using openpyxl Post 302998543 by durden_tyler on Saturday 3rd of June 2017 09:58:17 AM
Old 06-03-2017
If you do a Google search for the string: "openpyxl UserWarning: Unknown extension is not supported and will be removed", you will see this issue being reported by a lot of users.
In the first search result from StackOverflow, a very good explanation is given about this warning. The extension that they talk about is not a file extension, but "features" added to the Excel specification that openpyxl does not handle.

Keep in mind that openpyxl is an open-source module and is still under development.
And it needs to keep pace with newer extensions in newer versions of Excel specification.

The more concerning fact is that Python did not write anything to your Excel file.
(a) Could you post all versions that you are using?
(b) Also, could you add print statements to track the execution and determine where exactly it fails?
Does it find the Excel files and text files and csv-read the text files and then fail at wb.append() or wb.save()? Does it fail before that?

I tried the posted code in two different laptops with following software versions:

Code:
Laptop 1:
Pythonxy installation on Windows 7 64-bit (http://python-xy.github.io/)

1)  Python 2.7.10
2)  openpyxl - don't know the version
3)  Excel - Microsoft Excel 2013

Laptop 2:
Anaconda installation on Debian 8 64-bit (https://docs.continuum.io/anaconda/install-linux.html)

1)  Python 3.6.0 on Anaconda 4.3.1 (64-bit)
2)  openpyxl version 2.4.1
3)  Libreoffice Calc 4.3.3.2

In both cases, I created fresh new text and Excel/Libreoffice files with dummy data in text files and empty worksheets named "Filtered".
The Libreoffice file was saved as "Microsoft Excel 2007/2010/2013 XML (.xlsx)"

I did not see any warning in either case.
The data was written successfully to the "Filtered" worksheet in both cases.

---------- Post updated at 09:58 AM ---------- Previous update was at 09:42 AM ----------

Just remembered one more thing.
Ensure that all text and Excel files are closed when you run your Python script.
In Laptop 1, I remember seeing an error message since Microsoft Excel locks all open files and hence Python cannot write to it.
(This file-locking is a very well-known fact which you probably know, but I thought of mentioning it in any case.)
 

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LEARN ABOUT REDHAT

dos2unix

dos2unix(1)						      General Commands Manual						       dos2unix(1)

NAME

       dos2unix - DOS/MAC to UNIX text file format converter

SYNOPSYS

       dos2unix [options] [-c convmode] [-o file ...] [-n infile outfile ...]

       Options:

       [-hkqV] [--help] [--keepdate] [--quiet] [--version]

DESCRIPTION

       This manual page documents dos2unix, the program that converts plain text files in DOS/MAC format to UNIX format.

OPTIONS

       The following options are available:

       -h --help
	      Print online help.

       -k --keepdate
	      Keep the date stamp of output file same as input file.

       -q --quiet
	      Quiet mode. Suppress all warning and messages.

       -V --version
	      Prints version information.

       -c --convmode convmode
	      Sets conversion mode. Simulates dos2unix under SunOS.

       -o --oldfile file ...
	      Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.

       -n --newfile infile outfile ...
	      New  file  mode.	Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
	      used or you WILL lost your files.

EXAMPLES

       Get input from stdin and write output to stdout.

	      dos2unix

       Convert and replace a.txt. Convert and replace b.txt.

	      dos2unix a.txt b.txt

	      dos2unix -o a.txt b.txt

       Convert and replace a.txt in ASCII conversion mode.  Convert and replace b.txt in ISO conversion mode.  Convert	c.txt  from  Mac  to  Unix
       ascii format.

	      dos2unix a.txt -c iso b.txt

	      dos2unix -c ascii a.txt -c iso b.txt

	      dos2unix -c mac a.txt b.txt

       Convert and replace a.txt while keeping original date stamp.

	      dos2unix -k a.txt

	      dos2unix -k -o a.txt

       Convert a.txt and write to e.txt.

	      dos2unix -n a.txt e.txt

       Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.

	      dos2unix -k -n a.txt e.txt

       Convert and replace a.txt. Convert b.txt and write to e.txt.

	      dos2unix a.txt -n b.txt e.txt

	      dos2unix -o a.txt -n b.txt e.txt

       Convert c.txt and write to e.txt. Convert and replace a.txt.  Convert and replace b.txt. Convert d.txt and write to f.txt.

	      dos2unix -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt

DIAGNOSTICS

BUGS

       The program does not work properly under MSDOS in stdio processing mode.  If you know why is that so, please tell me.

AUTHORS

       Benjamin Lin - <blin@socs.uts.edu.au>

       Bernd Johannes Wuebben (mac2unix mode) <wuebben@kde.org>

MISCELLANY

       Tested environment:

	      Linux 1.2.0 with GNU C 2.5.8

	      SunOS 4.1.3 with GNU C 2.6.3

	      MS-DOS 6.20 with Borland C++ 4.02

       Suggestions and bug reports are welcome.

SEE ALSO

       unix2dos(1) mac2unix(1)

1995.03.31							   dos2unix v3.0						       dos2unix(1)
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