Printing unix Line endings from Windows.

[Ant]

Hi all,

I've got a problem here which has me stumped. I've got a python script
which does some text processing on some files and writes it back out to
the same file using the fileinput module with inplace set to True.

The script needs to run from Windows, but the files need to be written
with Unix line endings.

Is there any way of doing this without having to post-process the file
in binary mode (a-la the crlf.py script)

Cheers,

[Larry Bates]

Ant wrote:

Hi all,

I've got a problem here which has me stumped. I've got a python script
which does some text processing on some files and writes it back out to
the same file using the fileinput module with inplace set to True.

The script needs to run from Windows, but the files need to be written
with Unix line endings.

Is there any way of doing this without having to post-process the file
in binary mode (a-la the crlf.py script)

Cheers,

You can write to a new file and create your own line endings.
When done, delete the original file and rename the output file.

-Larry

[Ant]

Larry Bates wrote:

Ant wrote:

....

Is there any way of doing this without having to post-process the file
in binary mode (a-la the crlf.py script)

....

You can write to a new file and create your own line endings.
When done, delete the original file and rename the output file.

How can I create my own line endings? I've tried setting os.linesep =
"\n", (and to \x0a). I've tried things like:

print "xxx yyy \n",
print "xxx uuu \x0a",
filehandle.write("xxx \n")
filehandle.write("xxx \x0a")

and all of these give me a nice windows-style crlf!

Surely there must be a way to do this ...

[Fredrik Lundh]

Ant wrote:

How can I create my own line endings? I've tried setting os.linesep =
"\n", (and to \x0a). I've tried things like:

print "xxx yyy \n",
print "xxx uuu \x0a",
filehandle.write("xxx \n")
filehandle.write("xxx \x0a")

and all of these give me a nice windows-style crlf!

Surely there must be a way to do this ...

endline normalization is done by the file object, on the way out. to
switch this off, open the output file in binary mode ("wb").

</F>

[John Machin]

Ant wrote:

Larry Bates wrote:

Ant wrote:

...

Is there any way of doing this without having to post-process the file
in binary mode (a-la the crlf.py script)

...

You can write to a new file and create your own line endings.
When done, delete the original file and rename the output file.

How can I create my own line endings? I've tried setting os.linesep =
"\n", (and to \x0a). I've tried things like:

print "xxx yyy \n",
print "xxx uuu \x0a",
filehandle.write("xxx \n")
filehandle.write("xxx \x0a")

and all of these give me a nice windows-style crlf!

Surely there must be a way to do this ...

and there is: open your output file in binary mode; then it won't
convert every \n to \r\n.

writing:
| >>f = open('unixlf.txt', 'wb')
| >>f.write('foo\n')
| >>f.write('bar\n')
| >>f.close()

checking:
| >>f = open('unixlf.txt', 'rb')
| >>x = f.read()
| >>x
| 'foo\nbar\n'
| >>len(x)
| 8

BTW:
| >>'\n' is '\x0a'
| True

HTH,
John

[Ant]

John Machin wrote:

Ant wrote:

....

filehandle.write("xxx \n")
filehandle.write("xxx \x0a")

and all of these give me a nice windows-style crlf!

Surely there must be a way to do this ...

and there is: open your output file in binary mode; then it won't
convert every \n to \r\n.

....

| >>'\n' is '\x0a'
| True

(and F wrote something very similar.)

Cheers guys. Shame that fileinput doesn't take an argument to specify
the write mode when 'inplace' is True, because it is otherwise makes
editing multiple files in place very simple.

Is it worth me submitting a patch to fileinput which can take an
optional write mode parameter?

Cheers,

[Fredrik Lundh]

Ant wrote:

Is it worth me submitting a patch to fileinput which can take an
optional write mode parameter?

absolutely.

</F>