perl to python

[Olivier Scalbert]

Hello ,

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file
?
Thanks
Olivier

[Jarek Zgoda]

Olivier Scalbert <ol************ **@algosyn.com> pisze:

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file

Use sed.

--
Jarek Zgoda
http://jpa.berlios.de/

[Olivier Scalbert]

Jarek Zgoda wrote:

Olivier Scalbert <ol************ **@algosyn.com> pisze:

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file

Use sed.

yes, but in python ?

[Jarek Zgoda]

Olivier Scalbert <ol************ **@algosyn.com> pisze:

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file

Use sed.

yes, but in python ?

Are you paid for doing everything in Python? This problem is much easier
to sort out by other means.

But of course, it is possible. I'm pretty sure you will get such
solution here.

--
Jarek Zgoda
http://jpa.berlios.de/

[Donald 'Paddy' McCarthy]

Olivier Scalbert wrote:

Jarek Zgoda wrote:

Olivier Scalbert <ol************ **@algosyn.com> pisze:

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file

Use sed.

yes, but in python ?

I wonder what the motivation behind your question is?
Do you have Python and not Perl or sed available?
Is the request from part of a larger conversion task?
Do you just want to compare the Perl to the Python solution?

Pad.

[John Roth]

"Olivier Scalbert" <ol************ **@algosyn.com> wrote in message
news:40******** *************** @news.skynet.be ...

Hello ,

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file
?
Thanks
Olivier

I'm not sure what the -pi and -e switches do, but the
rest is fairly simple, although not as simple as the perl
one-liner.

Just load the file into a string variable, and either
use the string .replace() method, or use a regx,
depending on which is appropriate. Then write
it back out.

from the python prompt (not the command prompt)
that's something like: (untested)

var = open("file", "r").read().rep lace("string1", "string2")
open("file", "w").write( var)

I think this is about as obfusticated as you can get -
you'll lose the file if you try for a one-liner.

John Roth

[Olivier Scalbert]

John Roth wrote:

"Olivier Scalbert" <ol************ **@algosyn.com> wrote in message
news:40******* *************** *@news.skynet.b e...

Hello ,

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file
?
Thanks
Olivier

I'm not sure what the -pi and -e switches do, but the
rest is fairly simple, although not as simple as the perl
one-liner.

Just load the file into a string variable, and either
use the string .replace() method, or use a regx,
depending on which is appropriate. Then write
it back out.

from the python prompt (not the command prompt)
that's something like: (untested)

var = open("file", "r").read().rep lace("string1", "string2")
open("file", "w").write( var)

I think this is about as obfusticated as you can get -
you'll lose the file if you try for a one-liner.

John Roth

Thx John !

[Jason Mobarak]

John Roth wrote:

"Olivier Scalbert" <ol************ **@algosyn.com> wrote in message
news:40******** *************** @news.skynet.be ...

Hello ,

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file
?
Thanks
Olivier

I'm not sure what the -pi and -e switches do, but the
rest is fairly simple, although not as simple as the perl
one-liner.

Just load the file into a string variable, and either
use the string .replace() method, or use a regx,
depending on which is appropriate. Then write
it back out.

from the python prompt (not the command prompt)
that's something like: (untested)

var = open("file", "r").read().rep lace("string1", "string2")
open("file", "w").write( var)

I think this is about as obfusticated as you can get -
you'll lose the file if you try for a one-liner.

John Roth

More obfuscated:

python -c '(lambda fp: fp.write(fp.see k(0) or
"".join([L.replace("th", "ht") for L in fp])))(file("foo", "rw+"))'

[Michael Coleman]

Olivier Scalbert <ol************ **@algosyn.com> writes:

Jarek Zgoda wrote:

Olivier Scalbert <ol************ **@algosyn.com> pisze:

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file

Use sed.

yes, but in python ?

Jarek's answer is the correct one, for almost any real situation.

For the purposes of exposition, though, a pythonic equivalent would
be:

import fileinput

for l in fileinput.input ():
print l.replace('stri ng1', 'string2')

If you want regular expression substitution and not just constant
strings, use re.sub instead.

Mike

--
Mike Coleman, Scientific Programmer, [phone]
Stowers Institute for Biomedical Research
1000 E. 50th St., Kansas City, MO 64110

[Steven Rumbalski]

Olivier Scalbert wrote:

Jarek Zgoda wrote:

Olivier Scalbert <ol************ **@algosyn.com> pisze:

What is the python way of doing this :
perl -pi -e 's/string1/string2/' file

Use sed.

yes, but in python ?

print 'Use sed.'
--
Steven Rumbalski
news|at|rumbals ki|dot|com