How to merge two binary files into one?

[could ildg]

I want to merge file A and file B into a new file C,
All of them are binary.
How to do that?
thanks a lot.

 

[Grant Edwards]

I want to merge file A and file B into a new file C, All of
them are binary.

file('C','wb').write(file('A','rb').read()+file('B','rb').read())

 

[could ildg]

Thank you!
Python is really magic, even merge file can use "+".

 

[Grant Edwards]

Python is really magic, even merge file can use "+".

You probably shouldn't use the above code for very large files,
since it reads files A and B entirely into memory before
writing the combined data to C.

For large files, something like this is probably a better idea:

fout = file('C','wb')
for n in ['A','B']:
fin = file(n,'rb')
while True:
data = fin.read(65536)
if not data:
break
fout.write(data)
fin.close()
fout.close()

 

[could ildg]

Thank Grant, it works well.

Python is really magic, even merge file can use "+".

You probably shouldn't use the above code for very large files,
since it reads files A and B entirely into memory before
writing the combined data to C.

For large files, something like this is probably a better idea:

fout = file('C','wb')
for n in ['A','B']:
fin = file(n,'rb')
while True:
data = fin.read(65536)
if not data:
break
fout.write(data)
fin.close()
fout.close()

 

[Andrew Dalke]

For large files, something like this is probably a better idea:

Or with the little-used shutil module, and keeping your
nomenclature and block size of 65536

import shutil
fout = file('C', 'wb')
for n in ['A', 'B']:
fin = file(n, 'rb')
shutil.copyfileobj(fin, fout, 65536)
fin.close()
fout.close()


Andrew
(e-mail address removed)

 

[could ildg]

I'm so glad that this this problem has so many recipes.

For large files, something like this is probably a better idea:

Or with the little-used shutil module, and keeping your
nomenclature and block size of 65536

import shutil
fout = file('C', 'wb')
for n in ['A', 'B']:
fin = file(n, 'rb')
shutil.copyfileobj(fin, fout, 65536)
fin.close()
fout.close()

Andrew
(e-mail address removed)

 

[Grant Edwards]

Or with the little-used shutil module, and keeping your
nomenclature and block size of 65536

I knew I should have looked through shutil to see if there was
already something like that.