On 4/25/05, Kirk Job Sluder <[EMAIL PROTECTED]> wrote:
> In addition, I would argue that editing a file in place using a
> non-interactive program is dangerous and bad practice in general. By
> the time you find a bug in your edit script, the original is lost. This
> is something I learned from b
Steve Holden <[EMAIL PROTECTED]> writes:
> kah wrote:
> However, you asked about replacing one line with another of a
> different length: since this will mean changing the offsets of all
> subsequent bytes you have no way to do this other than writing out the
> whole content of the file following
You might be able to use "edge" case to make this simple.
1) If the line you are replacing is unique in the file
and
2) File can easily fit in memory
you can write:
fp=open(filename, 'r')
contents=fp.read()
fp.close()
newcontents=newline.join(contents.split(line2))
fp=open(filename, 'w')
fp.wr
Hello kah,
> How do I change a line in a file??
>
> For example I have the follwing text in my file:
>
> line1
> line2
> line3
> line4
>
> How do I replace 'line2' with 'newline'. Since the write operation in
> python will overwrite everything.
See http://docs.python.org/lib/module-fileinput.h
kah wrote:
Hi,
the example provided by Vishnu is quite close to what I want but it
still required me to write all the data back to the file.
Is there any way where I can just write a particular line?
If you are asking whether you can update a file in place, the answer is
"yes" - look up "lseek" in
Hi,
the example provided by Vishnu is quite close to what I want but it
still required me to write all the data back to the file.
Is there any way where I can just write a particular line?
Regards,
Kah
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http://mail.python.org/mailman/listinfo/python-list
H,
Vishnu
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
kah
Sent: Monday, April 25, 2005 3:09 PM
To: python-list@python.org
Subject: Changing a line in a text file
How do I change a line in a file??
For example I have the follwing text in my file:
lin
kah wrote:
How do I change a line in a file??
For example I have the follwing text in my file:
line1
line2
line3
line4
How do I replace 'line2' with 'newline'. Since the write operation in
python will overwrite everything.
This is the best I can figure out what you mean:
lines = []
for line in fil
How do I change a line in a file??
For example I have the follwing text in my file:
line1
line2
line3
line4
How do I replace 'line2' with 'newline'. Since the write operation in
python will overwrite everything.
Regards,
Kah
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http://mail.python.org/mailman/listinfo/python-list
