I use aria2c to download files, aria2c has this feature of allocating the
memory to file before downloading the file and then it will download using
multiple connections so filling the data into this file concurrently.
So i wonder how to do it. I found a way to do that from here
http://stackoverfl
On 3/5/2014 1:59 AM, loial wrote:
Unfortunately I have to use python 2.6 for this
Did you try it?
Emile
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https://mail.python.org/mailman/listinfo/python-list
On 05/03/2014 09:59, loial wrote:
I'm pleased to see that you have answers. In return would you please
read and action this https://wiki.python.org/moin/GoogleGroupsPython to
prevent us seeing double line spacing, thanks.
--
My fellow Pythonistas, ask not what our language can do for you, as
loial Wrote in message:
> How do I read a binary file, find/identify a character string and replace it
> with another character string and write out to another file?
>
> Its the finding of the string in a binary file that I am not clear on.
>
> Any help appreciated
>
>
> >>
>
> >>> How do I read a binary file, find/identify a character string and replace
>
> >>> it with another character string and write out to another file?
>
> >>>
>
> >>> Its the finding of the string in a binary
On 03/04/2014 02:44 PM, Chris Angelico wrote:
On Wed, Mar 5, 2014 at 12:18 AM, Peter Otten <__pete...@web.de> wrote:
loial wrote:
How do I read a binary file, find/identify a character string and replace
it with another character string and write out to another file?
Its the finding
On Wed, Mar 5, 2014 at 12:18 AM, Peter Otten <__pete...@web.de> wrote:
> loial wrote:
>
>> How do I read a binary file, find/identify a character string and replace
>> it with another character string and write out to another file?
>>
>> Its the finding of the s
loial wrote:
> How do I read a binary file, find/identify a character string and replace
> it with another character string and write out to another file?
>
> Its the finding of the string in a binary file that I am not clear on.
That's not possible. You have to convert either
On 2014-03-04 12:27, loial wrote:
How do I read a binary file, find/identify a character string and
replace it with another character string and write out to another
file?
Its the finding of the string in a binary file that I am not clear
on.
Any help appreciated
Read it in chunks and search
How do I read a binary file, find/identify a character string and replace it
with another character string and write out to another file?
Its the finding of the string in a binary file that I am not clear on.
Any help appreciated
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https://mail.python.org/mailman/listinfo/python-list
Op 14-11-13 01:53, Sudheer Joseph schreef:
> Hi,
> I need to write a binary file exactly as written by fortran code
> below to be read by another code which is part of a model which is not
> advisable to edit.I would like to use python for this purpose as python has
> m
Thank you,
But it wont allow to write it in unformatted way so
that the fortran code can read
with
open(11,file="input.bin")
read(11) IWI,JWI,XFIN,YFIN,DXIN,DYIN,NREC,WDAY
with best regards,
sudheer
On Thu, Nov 14, 2013 at 7:48 PM, Oscar Benjamin
wrote:
> On 14 November
On 14 November 2013 00:53, Sudheer Joseph wrote:
> My trial code with Python (data is read from file here)
>
> from netCDF4 import Dataset as nc
> import numpy as np
> XFIN=0.0,YFIN=-90.0,NREC=1461,DXIN=0.5;DYIN=0.5
> TITLE="NCMRWF 6HOURLY FORCING MKS"
> nf=nc('ncmrwf_uv.nc')
> ncv=nf.variables.ke
(So
never use the buildit open and write of Python and Fortran, but always the
NetCDF library).
Hope it helps,
David
Quoting Sudheer Joseph (2013-11-14 01:53:42)
> Hi,
> I need to write a binary file exactly as written by fortran code
> below to be read by another code which is pa
Hi,
I need to write a binary file exactly as written by fortran code below
to be read by another code which is part of a model which is not advisable to
edit.I would like to use python for this purpose as python has mode flexibility
and easy coding methods.
character(40) :: TITLE
Hi,
I am looking in to improving Python 3.X support for PyFilesystem (https://
code.google.com/p/pyfilesystem/).
There is provisional Python 3 support in there, but a stumbling block is
that I would like the open method to work like io.open in Py3 --
specifically returning text mode streams tha
On Sun, 29 Jan 2012 15:50:49 +0100, Aaron wrote:
> On 01/29/2012 03:04 PM, Andrea Crotti wrote:
>> On 01/29/2012 07:51 AM, contro opinion wrote:
>>> please download the attachment ,and put in c:\test.data
>>>
>>>
>> Your program should never use hard-coded path, and actually I think the
>> majori
On 01/29/2012 03:04 PM, Andrea Crotti wrote:
On 01/29/2012 07:51 AM, contro opinion wrote:
please download the attachment ,and put in c:\test.data
Your program should never use hard-coded path, and actually
I think the majority here is not using windows.
But I also think that the majority o
On 01/29/2012 07:51 AM, contro opinion wrote:
please download the attachment ,and put in c:\test.data
Your program should never use hard-coded path, and actually
I think the majority here is not using windows.
--
http://mail.python.org/mailman/listinfo/python-list
On Sun, 29 Jan 2012 13:39:25 +0100, Peter Otten wrote:
> contro opinion wrote:
>
>> please download the attachment ,and put in c:\test.data
>
> Your data didn't make it through.
Since this is a text-only newsgroup, it won't.
>> and run the folloeing code:
>>
>> from struct import unpack
>>
contro opinion wrote:
> please download the attachment ,and put in c:\test.data
Your data didn't make it through.
> and run the folloeing code:
>
> from struct import unpack
> file_obj = open('c:\\test.data', 'r')
Open the file in binary mode to disable CRNL-to-NL translation which will
corr
please download the attachment ,and put in c:\test.data
and run the folloeing code:
from struct import unpack
file_obj = open('c:\\test.data', 'r')
day = file_obj.read(40)
while day:
parsed = list(unpack('LLL', day[:28]))
print parsed
day = file_obj.read(4
>
> 2.6 is expecting a string, according to the above. No mention of file.
> Moreover it expects the data to be urlencoded. 2.7.1 docs say the same
> thing. Are you sure you have shown the code that worked with 2.6?
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Yes, in fact I si
On Thu, May 12, 2011 10:20 am, Michiel Sikma wrote:
> Hi there,
> I made a small script implementing a part of Youtube's API that allows
> you to upload videos. It's pretty straightforward and uses urllib2.
> The script was written for Python 2.6, but the server I'm going to use
> it on only has 2.
Hi there,
I made a small script implementing a part of Youtube's API that allows
you to upload videos. It's pretty straightforward and uses urllib2.
The script was written for Python 2.6, but the server I'm going to use
it on only has 2.5 (and I can't update it right now, unfortunately).
It seems t
Finally i had problems to save the files what are encoded i can't encode
the string to save the file, any ideas?
On Oct 6, 2010 3:15pm, hid...@gmail.com wrote:
Ppl thanyou, for all your help finally i did it! thanks, another
thing to who i can send a propose code, i fixed the little probl
Ppl thanyou, for all your help finally i did it! thanks, another thing
to who i can send a propose code, i fixed the little problem of the
wsig.input in Python 3 i will tested in the next months but i want to share
the code with the community, how i can do that?
On Oct 6, 2010 3:13pm, h
Ppl thanyou, for all your help finally i did it! thanks, another thing
to i have to send a propouse code, i can fixed the litle problem of the
wsig.input in Python 3 i will tested in the next months but i want to share
the code with the comunnity, how i can do that?
On Oct 6, 2010 1:45p
On 06/10/2010 15:25, hid...@gmail.com wrote:
When you put the 'wb' extension you have to pass a Encode the string
Python does not accept a string on a wb file, Python3
[snip]
You are using Python 3 and type(str) returns ""?
Binary data in Python 3 should be an instance of the 'bytes' class, no
quot; jo...@lophus.org> wrote:
>
> >> > > On 10/05/2010 11:11 PM, hid...@gmail.com wrote:
>
> >> > > Hello, how i can save a binary file, i read in the manual in the
IO
>
> >> area
>
> >> > > but doesn' t show how to save it
> wrote:
>> > > On 10/05/2010 11:11 PM, hid...@gmail.com wrote:
>> > > Hello, how i can save a binary file, i read in the manual in the IO
>> area
>> > > but doesn' t show how to save it.
>>
>> > > Here is the co
> > On Oct 5, 2010 6:18pm, "Jonas H." jo...@lophus.org> wrote:
>> > > On 10/05/2010 11:11 PM, hid...@gmail.com wrote:
>> > > Hello, how i can save a binary file, i read in the manual in the IO
>> area
>> > > but doesn' t show how t
binary code here is:
[snip]
Sorry for the last send.
> On Oct 5, 2010 6:18pm, "Jonas H." jo...@lophus.org> wrote:
> > On 10/05/2010 11:11 PM, hid...@gmail.com wrote:
> >
> >
> > Hello, how i can save a binary file, i read in the manual in t
..@lophus.org> wrote:
> > On 10/05/2010 11:11 PM, hid...@gmail.com wrote:
> >
> >
> > Hello, how i can save a binary file, i read in the manual in the IO
area
> >
> > but doesn' t show how to save it.
> >
> > Here is the code what i am using:
\\x11\\x83\\x8aU\\x90\\xf4#&\\x9e\\xc3\\x8c?D\\x89\\x1eBC\\x17\\xe7\\xe5B
Sorry for the last send.
On Oct 5, 2010 6:18pm, "Jonas H." jo...@lophus.org> wrote:
> On 10/05/2010 11:11 PM, hid...@gmail.com wrote:
>
>
> Hello, how i can save a binary file, i read in th
On 10/05/2010 11:11 PM, hid...@gmail.com wrote:
Hello, how i can save a binary file, i read in the manual in the IO area
but doesn' t show how to save it.
Here is the code what i am using:
s = open('/home/hidura/test.jpeg', 'wb')
s.write(str.encode(formFields[5]))
s
Hello, how i can save a binary file, i read in the manual in the IO area
but doesn' t show how to save it.
Here is the code what i am using:
s = open('/home/hidura/test.jpeg', 'wb')
s.write(str.encode(formFields[5]))
s.close()
If needs the binary code i could upload.
-
eskandari wrote:
On May 31, 12:30 pm, MRAB wrote:
eskandari wrote:
Hi,
I am a newbie in python. I have an data.pickle file which is
serialized form of an "array of strings", I want to write their
offsets in another binary file, so an C++ program can read and analyse
them.
On 5/31/2010 12:43 PM, eskandari wrote:
On May 31, 12:30 pm, MRAB wrote:
eskandari wrote:
Use the 'struct' module to convert the int to a bytestring, and remember
to open the file as a binary file.
Thanks alot,
I have an question, if I do so, Will the second program (C++ prog
On May 31, 12:30 pm, MRAB wrote:
> eskandari wrote:
> > Hi,
> > I am a newbie in python. I have an data.pickle file which is
> > serialized form of an "array of strings", I want to write their
> > offsets in another binary file, so an C++ program can read and
On 05/31/2010 10:56 AM, eskandari wrote:
But when I try to write offset (number) in binary file, it raise
exception below in line "offsetfile.write(offset)"
"TypeError: argument 1 must be string or read-only buffer, not int"
I search the internet, find that all suggest
eskandari wrote:
Hi,
I am a newbie in python. I have an data.pickle file which is
serialized form of an "array of strings", I want to write their
offsets in another binary file, so an C++ program can read and analyse
them.
But when I try to write offset (number) in binary file
Hi,
I am a newbie in python. I have an data.pickle file which is
serialized form of an "array of strings", I want to write their
offsets in another binary file, so an C++ program can read and analyse
them.
But when I try to write offset (number) in binary file, it raise
exception bel
Hi there,
Using Python 3.1.2 I am having a problem sending binary attachment files
(jpeg, pdf, etc.) - MIMEText attachments work fine. The code in question
is as follows...
for file in self.attachments:
part = MIMEBase('application', "octet-stream")
part.set_payload(open(file,"rb").read()
> Another possibility is to open the file in binary mode and do the
> encoding yourself when writing text. This might actually be a better
> solution, since I'm not sure RTF uses utf-8 by default.
Yes, thanks for this suggestion, it seems the best to me. Actually RTF
is not UTF-8 encoded, it's 8
Antoine Pitrou, 25.04.2010 02:16:
Another possibility is to open the file in binary mode and do the
encoding yourself when writing text. This might actually be a better
solution, since I'm not sure RTF uses utf-8 by default.
That's a lot cleaner as it doesn't use two interfaces to write to the
Hello,
> I have to read the contents of a binary file (a PNG file exactly), and
> dump it into an RTF file.
>
> The RTF-file has been opened with codecs.open in utf-8 mode.
You should use the built-in open() function. codecs.open() is outdated in
Python 3.
> As I expected, th
Thanks, I'll try this.
> I have no idea how you'd go about reading the contents of such a file
> in a sensible way.
The purpose is to embed PNG pictures in an RTF file that will be read
by OpenOffice. It seems that OpenOffice reads RTF in 8-bit, so it
should be ok.
The RTF is produced from a TeX
On Fri, Apr 23, 2010 at 9:48 AM, Chris Rebert wrote:
> On Fri, Apr 23, 2010 at 9:22 AM, wrote:
>> I have to read the contents of a binary file (a PNG file exactly), and
>> dump it into an RTF file.
>> how can I tell python to dump the bytes as they are, without
>>
On Fri, Apr 23, 2010 at 9:22 AM, wrote:
> I have to read the contents of a binary file (a PNG file exactly), and
> dump it into an RTF file.
>
> The RTF-file has been opened with codecs.open in utf-8 mode.
>
> As I expected, the utf-8 decoder
You mean encoder.
> chokes on
Hello.
I have to read the contents of a binary file (a PNG file exactly), and
dump it into an RTF file.
The RTF-file has been opened with codecs.open in utf-8 mode.
As I expected, the utf-8 decoder chokes on some combinations of bits;
how can I tell python to dump the bytes as they are, without
En Tue, 22 Sep 2009 18:18:16 -0300, Jose Rafael Pacheco
escribió:
Hello,
I want to read from a binary file called myaudio.dat
Then I've tried the next code:
import struct
name = "myaudio.dat"
f = open(name,'rb')
f.seek(0)
chain = "< 4s 4s I 4s I 20s I I i
> char is 1 bytes long on Python (as per struct modules' definition)
Also, this is also another option for you to use instead of built-in struct.
http://www.sis.nl/python/xstruct/xstruct.shtml
--
Regards,
Ishwor Gurung
--
http://mail.python.org/mailman/listinfo/python-list
x27;Jul 13 11:57:41 1994', 'identNOTE': 68, 'max_cA': -44076,
> 'cid': 'DS16', 'hcid32': 32, 'identifier': 'FORM', 'clength': 300126}
>
> So far when I run f.tell()
>>>f.tell()
> 136L
tell( ) giv
Hello,
I want to read from a binary file called myaudio.dat
Then I've tried the next code:
import struct
name = "myaudio.dat"
f = open(name,'rb')
f.seek(0)
chain = "< 4s 4s I 4s I 20s I I i 4s I 67s s 4s I"
s = f.read(4*1+4*1+4*1+4*1+4*1+20*1+4*1+4*1+4*1+4*1
Jose Rafael Pacheco wrote:
Hello,
I want to read from a binary file called myaudio.dat
Then I've tried the next code:
import struct
name = "myaudio.dat"
f = open(name,'rb')
f.seek(0)
chain = "< 4s 4s I 4s I 20s I I i 4s I 67s s 4s I"
s = f.read(4*1+4*1+4*1
On Tue, Sep 22, 2009 at 4:30 PM, Jose Rafael Pacheco
wrote:
> Hello,
>
> I want to read from a binary file called myaudio.dat
> Then I've tried the next code:
>
> import struct
> name = "myaudio.dat"
> f = open(name,'rb')
> f.seek(0)
Don
Hello,
I want to read from a binary file called myaudio.dat
Then I've tried the next code:
import struct
name = "myaudio.dat"
f = open(name,'rb')
f.seek(0)
chain = "< 4s 4s I 4s I 20s I I i 4s I 67s s 4s I"
s = f.read(4*1+4*1+4*1+4*1+4*1+20*1+4*1+4*1+4*1+4*1
Hello Friends,
It's my first post to python-list, so first let me introduce myself...
* my name is Jan Kaliszewski,
* country -- Poland,
* occupation -- composer (studied in F. Chopin Academy of Music @Warsaw)
and programmer (currently in Record System company,
binary, so
I went digging into Python to see if there were any modules to help.
I found one I think might do what I want it to do - the binascii
module. Can anyone describe to me how to convert a raw binary file to
an ascii file using this module. I've tried? Boy, I've tried.
a hex editor to see text strings in the binary code. I
> >> > don't see a way to save these ascii representations of the binary, so
> >> > I went digging into Python to see if there were any modules to help.
>
> >> > I found one I think might do what I
way to save these ascii representations of the binary, so
>> > I went digging into Python to see if there were any modules to help.
>>
>> > I found one I think might do what I want it to do - the binascii
>> > module. Can anyone describe to me how to convert a raw
On Jul 27, 10:11 am, Grant Edwards wrote:
> On 2009-07-27, r2 wrote:
>
> > I have a memory dump from a machine I am trying to analyze. I can view
> > the file in a hex editor to see text strings in the binary code. I
> > don't see a way to save these ascii representations of the binary,
>
> $ str
ntations of the binary, so
> > I went digging into Python to see if there were any modules to help.
>
> > I found one I think might do what I want it to do - the binascii
> > module. Can anyone describe to me how to convert a raw binary file to
> > an ascii file using th
On 2009-07-27, r2 wrote:
> I have a memory dump from a machine I am trying to analyze. I can view
> the file in a hex editor to see text strings in the binary code. I
> don't see a way to save these ascii representations of the binary,
$ strings memdump.binary >memdump.strings
$ hexdump -C memd
y modules to help.
>
> I found one I think might do what I want it to do - the binascii
> module. Can anyone describe to me how to convert a raw binary file to
> an ascii file using this module. I've tried? Boy, I've tried.
That won't work because a text editor does
think might do what I want it to do - the binascii
module. Can anyone describe to me how to convert a raw binary file to
an ascii file using this module. I've tried? Boy, I've tried.
Am I correct in assuming I can get the converted binary to ascii text
I see in a hex editor using this mod
> Adam Olsen (AO) wrote:
>AO> The Wayback Machine has 150 billion pages, so 2**37. Google's index
>AO> is a bit larger at over a trillion pages, so 2**40. A little closer
>AO> than I'd like, but that's still 56294995000 to 1 odds of having
>AO> *any* collisions between *any* of the file
On Fri, 17 Apr 2009 11:19:31 -0700, Adam Olsen wrote:
> Actually, *cryptographic* hashes handle that just fine. Even for files
> with just a 1 bit change the output is totally different. This is known
> as the Avalanche Effect. Otherwise they'd be vulnerable to attacks.
>
> Which isn't to say
In message , Nigel
Rantor wrote:
> Adam Olsen wrote:
>
>> The chance of *accidentally* producing a collision, although
>> technically possible, is so extraordinarily rare that it's completely
>> overshadowed by the risk of a hardware or software failure producing
>> an incorrect result.
>
> Not
On Apr 17, 9:59 am, SpreadTooThin wrote:
> You know this is just insane. I'd be satisfied with a CRC16 or
> something in the situation i'm in.
> I have two large files, one local and one remote. Transferring every
> byte across the internet to be sure that the two files are identical
> is just n
On Apr 17, 9:59 am, norseman wrote:
> The more complicated the math the harder it is to keep a higher form of
> math from checking (or improperly displacing) a lower one. Which, of
> course, breaks the rules. Commonly called improper thinking. A number
> of math teasers make use of that.
Of cou
On Apr 17, 5:30 am, Tim Wintle wrote:
> On Thu, 2009-04-16 at 21:44 -0700, Adam Olsen wrote:
> > The Wayback Machine has 150 billion pages, so 2**37. Google's index
> > is a bit larger at over a trillion pages, so 2**40. A little closer
> > than I'd like, but that's still 56294995000 to 1 od
On Apr 17, 4:54 am, Nigel Rantor wrote:
> Adam Olsen wrote:
> > On Apr 16, 11:15 am, SpreadTooThin wrote:
> >> And yes he is right CRCs hashing all have a probability of saying that
> >> the files are identical when in fact they are not.
>
> > Here's the bottom line. It is either:
>
> > A) Sever
Adam Olsen wrote:
On Apr 16, 11:15 am, SpreadTooThin wrote:
And yes he is right CRCs hashing all have a probability of saying that
the files are identical when in fact they are not.
Here's the bottom line. It is either:
A) Several hundred years of mathematics and cryptography are wrong.
The
On Thu, 2009-04-16 at 21:44 -0700, Adam Olsen wrote:
> The Wayback Machine has 150 billion pages, so 2**37. Google's index
> is a bit larger at over a trillion pages, so 2**40. A little closer
> than I'd like, but that's still 56294995000 to 1 odds of having
> *any* collisions between *any* o
Adam Olsen wrote:
On Apr 16, 11:15 am, SpreadTooThin wrote:
And yes he is right CRCs hashing all have a probability of saying that
the files are identical when in fact they are not.
Here's the bottom line. It is either:
A) Several hundred years of mathematics and cryptography are wrong.
The
Adam Olsen wrote:
On Apr 16, 4:27 pm, "Rhodri James"
wrote:
On Thu, 16 Apr 2009 10:44:06 +0100, Adam Olsen wrote:
On Apr 16, 3:16 am, Nigel Rantor wrote:
Okay, before I tell you about the empirical, real-world evidence I have
could you please accept that hashes collide and that no matter ho
On Apr 16, 4:27 pm, "Rhodri James"
wrote:
> On Thu, 16 Apr 2009 10:44:06 +0100, Adam Olsen wrote:
> > On Apr 16, 3:16 am, Nigel Rantor wrote:
> >> Okay, before I tell you about the empirical, real-world evidence I have
> >> could you please accept that hashes collide and that no matter how many
On Apr 16, 11:15 am, SpreadTooThin wrote:
> And yes he is right CRCs hashing all have a probability of saying that
> the files are identical when in fact they are not.
Here's the bottom line. It is either:
A) Several hundred years of mathematics and cryptography are wrong.
The birthday problem
On Thu, 16 Apr 2009 10:44:06 +0100, Adam Olsen wrote:
On Apr 16, 3:16 am, Nigel Rantor wrote:
Okay, before I tell you about the empirical, real-world evidence I have
could you please accept that hashes collide and that no matter how many
samples you use the probability of finding two files th
On Apr 16, 8:59 am, Grant Edwards wrote:
> On 2009-04-16, Adam Olsen wrote:
> > I'm afraid you will need to back up your claims with real files.
> > Although MD5 is a smaller, older hash (128 bits, so you only need
> > 2**64 files to find collisions),
>
> You don't need quite that many to have a
On Apr 16, 3:16 am, Nigel Rantor wrote:
> Adam Olsen wrote:
> > On Apr 15, 12:56 pm, Nigel Rantor wrote:
> >> Adam Olsen wrote:
> >>> The chance of *accidentally* producing a collision, although
> >>> technically possible, is so extraordinarily rare that it's completely
> >>> overshadowed by the
On 2009-04-16, Adam Olsen wrote:
> The chance of *accidentally* producing a collision, although
> technically possible, is so extraordinarily rare that it's
> completely overshadowed by the risk of a hardware or software
> failure producing an incorrect result.
Not when
Adam Olsen wrote:
On Apr 16, 3:16 am, Nigel Rantor wrote:
Adam Olsen wrote:
On Apr 15, 12:56 pm, Nigel Rantor wrote:
Adam Olsen wrote:
The chance of *accidentally* producing a collision, although
technically possible, is so extraordinarily rare that it's completely
overshadowed by the risk
On Apr 16, 3:16 am, Nigel Rantor wrote:
> Adam Olsen wrote:
> > On Apr 15, 12:56 pm, Nigel Rantor wrote:
> >> Adam Olsen wrote:
> >>> The chance of *accidentally* producing a collision, although
> >>> technically possible, is so extraordinarily rare that it's completely
> >>> overshadowed by the
Adam Olsen wrote:
On Apr 15, 12:56 pm, Nigel Rantor wrote:
Adam Olsen wrote:
The chance of *accidentally* producing a collision, although
technically possible, is so extraordinarily rare that it's completely
overshadowed by the risk of a hardware or software failure producing
an incorrect resu
On Apr 15, 12:56 pm, Nigel Rantor wrote:
> Adam Olsen wrote:
> > The chance of *accidentally* producing a collision, although
> > technically possible, is so extraordinarily rare that it's completely
> > overshadowed by the risk of a hardware or software failure producing
> > an incorrect result.
Adam Olsen wrote:
The chance of *accidentally* producing a collision, although
technically possible, is so extraordinarily rare that it's completely
overshadowed by the risk of a hardware or software failure producing
an incorrect result.
Not when you're using them to compare lots of files.
Tr
On Apr 15, 11:04 am, Nigel Rantor wrote:
> The fact that two md5 hashes are equal does not mean that the sources
> they were generated from are equal. To do that you must still perform a
> byte-by-byte comparison which is much less work for the processor than
> generating an md5 or sha hash.
>
> I
On Apr 15, 8:04 am, Grant Edwards wrote:
> On 2009-04-15, Martin wrote:
>
>
>
> > Hi,
>
> > On Mon, Apr 13, 2009 at 10:03 PM, Grant Edwards wrote:
> >> On 2009-04-13, SpreadTooThin wrote:
>
> >>> I want to compare two binary files and see if they are the same.
> >>> I see the filecmp.cmp functi
Grant Edwards wrote:
We all rail against premature optimization, but using a
checksum instead of a direct comparison is premature
unoptimization. ;)
And more than that, will provide false positives for some inputs.
So, basically it's a worse-than-useless approach for determining if two
files
Martin wrote:
On Wed, Apr 15, 2009 at 11:03 AM, Steven D'Aprano
wrote:
The checksum does look at every byte in each file. Checksumming isn't a
way to avoid looking at each byte of the two files, it is a way of
mapping all the bytes to a single number.
My understanding of the original question
On 2009-04-15, Martin wrote:
> On Wed, Apr 15, 2009 at 11:03 AM, Steven D'Aprano
> I'd still say rather burn CPU cycles than development hours (if I got
> the question right),
_Hours_? Calling the file compare module takes _one_line_of_code_.
Implementing a file compare from scratch takes abo
On 2009-04-15, Martin wrote:
> Hi,
>
> On Mon, Apr 13, 2009 at 10:03 PM, Grant Edwards wrote:
>> On 2009-04-13, SpreadTooThin wrote:
>>
>>> I want to compare two binary files and see if they are the same.
>>> I see the filecmp.cmp function but I don't get a warm fuzzy feeling
>>> that it is doin
On Wed, Apr 15, 2009 at 11:03 AM, Steven D'Aprano
wrote:
> The checksum does look at every byte in each file. Checksumming isn't a
> way to avoid looking at each byte of the two files, it is a way of
> mapping all the bytes to a single number.
My understanding of the original question was a way t
On Wed, 15 Apr 2009 07:54:20 +0200, Martin wrote:
>> Perhaps I'm being dim, but how else are you going to decide if two
>> files are the same unless you compare the bytes in the files?
>
> I'd say checksums, just about every download relies on checksums to
> verify you do have indeed the same fil
Hi,
On Mon, Apr 13, 2009 at 10:03 PM, Grant Edwards wrote:
> On 2009-04-13, SpreadTooThin wrote:
>
>> I want to compare two binary files and see if they are the same.
>> I see the filecmp.cmp function but I don't get a warm fuzzy feeling
>> that it is doing a byte by byte comparison of two files
On Apr 13, 8:39 pm, Grant Edwards wrote:
> On 2009-04-13, Peter Otten <__pete...@web.de> wrote:
>
> > But there's a cache. A change of file contents may go
> > undetected as long as the file stats don't change:
>
> Good point. You can fool it if you force the stats to their
> old values after you
I want to compare two binary files and see if they are the same.
I see the filecmp.cmp function but I don't get a warm fuzzy feeling
that it is doing a byte by byte comparison of two files to see if they
are they same.
What should I be using if not filecmp.cmp?
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