These problems only happen on Windows. On Linux everything works fine.
Has anyone else run into these bugs? Any suggestions?
Where do I find out the proper bug reporting process?
Problem #1:
While using the csv module's DictWriter on MSDOS (a.k.a. Windows2000),
the output files get newlines like \x0d\x0d\x0a instead of \x0d\x0a.
csvwriter = csv.DictWriter( file( out1filename, 'w' ), infieldnames, extrasaction='i gnore' )
csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
Problem #2:
While trying to fix up the first problem I run into another problem.
The following string replace code works until right around the boundary
at 2^7 * 1024, i.e. near 131072 (around line 1224), and then inserts a
bunch of \x00's in the string!
Before the \x00's, all of the \x0d's were correctly replaced. After the
\x00's, NONE of them were replaced.
content = file( fname, 'rb' ).read().replac e( '\x0d', '' )
file( fname, 'wb' ).write( content )
Problem #3:
The same problem also happens with the re module.
content = re.sub( '\x0d', '', file( fname, 'rb' ).read() )
file( fname, 'wb' ).write( content )
--
Daniel Ortmann, LSI Logic, 3425 40th Av NW, Suite 200, Rochester MN 55901
work: Da************@ lsil.com / 507.535.3861 / 63861 int / 8012.3861 gdds
home: or*****@isl.net / 507.288.7732, 2414 30Av NW #D, Rochester MN 55901 7  2315 
Daniel> Problem #1:
Daniel> While using the csv module's DictWriter on MSDOS
Daniel> (a.k.a. Windows2000), the output files get newlines like
Daniel> \x0d\x0d\x0a instead of \x0d\x0a.
Daniel> csvwriter = csv.DictWriter( file( out1filename, 'w' ), infieldnames, extrasaction='i gnore' )
Daniel> csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
CSV files are not really plain text files. The line terminator string is an
explicit property of the file. For example, you might want to write a CSV
file on a Windows 2000 machine which you intend to read on a Mac OS9 system
(where the line terminator is just \r). You need to open CSV files with the
'b' flag. This should work for you:
csvwriter = csv.DictWriter( file( out1filename, 'wb' ), infieldnames,
extrasaction='i gnore' )
csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
Skip
Daniel> Perhaps the documentation should say something about using
Daniel> binary mode?
Good point. I'll fix the docs.
Daniel> Or perhaps the DictWriter constructure should open the file in
Daniel> binary mode if given a string rather than a file object?
Nah, too much overloading going on.
Skip
Skip Montanaro <sk**@pobox.com > writes:
Daniel> While using the csv module's DictWriter on MSDOS
Daniel> (a.k.a. Windows2000), the output files get newlines like
Daniel> \x0d\x0d\x0a instead of \x0d\x0a.
Daniel> csvwriter = csv.DictWriter( file( out1filename, 'w' ), infieldnames, extrasaction='i gnore' )
Daniel> csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
Skip> CSV files are not really plain text files. The line terminator
Skip> string is an explicit property of the file. For example, you
Skip> might want to write a CSV file on a Windows 2000 machine which you
Skip> intend to read on a Mac OS9 system (where the line terminator is
Skip> just \r). You need to open CSV files with the 'b' flag. This
Skip> should work for you:
Skip> csvwriter = csv.DictWriter( file( out1filename, 'wb' ), infieldnames, extrasaction='i gnore' )
Skip> csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
Ok, that is the same work around that I used. Perhaps the documentation
should say something about using binary mode?
Or perhaps the DictWriter constructure should open the file in binary
mode if given a string rather than a file object?
How do we avoid people stumbling as I did?
--
Daniel Ortmann, LSI Logic, 3425 40th Av NW, Suite 200, Rochester MN 55901
work: Da************@ lsil.com / 507.535.3861 / 63861 int / 8012.3861 gdds
home: or*****@isl.net / 507.288.7732, 2414 30Av NW #D, Rochester MN 55901
Daniel> Problem #1:
Daniel> While using the csv module's DictWriter on MSDOS
Daniel> (a.k.a. Windows2000), the output files get newlines like
Daniel> \x0d\x0d\x0a instead of \x0d\x0a.
Daniel> csvwriter = csv.DictWriter( file( out1filename, 'w' ), infieldnames, extrasaction='i gnore' )
Daniel> csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
CSV files are not really plain text files. The line terminator string is an
explicit property of the file. For example, you might want to write a CSV
file on a Windows 2000 machine which you intend to read on a Mac OS9 system
(where the line terminator is just \r). You need to open CSV files with the
'b' flag. This should work for you:
csvwriter = csv.DictWriter( file( out1filename, 'wb' ), infieldnames,
extrasaction='i gnore' )
csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
Skip
Daniel> Perhaps the documentation should say something about using
Daniel> binary mode?
Good point. I'll fix the docs.
Daniel> Or perhaps the DictWriter constructure should open the file in
Daniel> binary mode if given a string rather than a file object?
Nah, too much overloading going on.
Skip
Skip Montanaro <sk**@pobox.com > writes:
Daniel> While using the csv module's DictWriter on MSDOS
Daniel> (a.k.a. Windows2000), the output files get newlines like
Daniel> \x0d\x0d\x0a instead of \x0d\x0a.
Daniel> csvwriter = csv.DictWriter( file( out1filename, 'w' ), infieldnames, extrasaction='i gnore' )
Daniel> csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
Skip> CSV files are not really plain text files. The line terminator
Skip> string is an explicit property of the file. For example, you
Skip> might want to write a CSV file on a Windows 2000 machine which you
Skip> intend to read on a Mac OS9 system (where the line terminator is
Skip> just \r). You need to open CSV files with the 'b' flag. This
Skip> should work for you:
Skip> csvwriter = csv.DictWriter( file( out1filename, 'wb' ), infieldnames, extrasaction='i gnore' )
Skip> csvwriter.write row( dict( zip( infieldnames, infieldnames ) ) )
Ok, that is the same work around that I used. Perhaps the documentation
should say something about using binary mode?
Or perhaps the DictWriter constructure should open the file in binary
mode if given a string rather than a file object?
How do we avoid people stumbling as I did?
--
Daniel Ortmann, LSI Logic, 3425 40th Av NW, Suite 200, Rochester MN 55901
work: Da************@ lsil.com / 507.535.3861 / 63861 int / 8012.3861 gdds
home: or*****@isl.net / 507.288.7732, 2414 30Av NW #D, Rochester MN 55901 This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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