Python 3.1.2 and marshal

[raj]

Hi,

I am using 64 bit Python on an x86_64 platform (Fedora 13).  I have
some code that uses the python marshal module to serialize some
objects to files. However, in moving the code to python 3 I have come
across a situation where, if more than one object has been serialized
to a file, then while trying to de-serialize only the first object is
de-serialized. Trying to de-serialize the second object raises an
EOFError. De-serialization of multiple objects works fine in Python
2.x. I tried going through the Python 3 documentation to see if
marshal functionality has been changed, but haven't found anything to
that effect.  Does anyone else see this problem?  Here  is some
example code:

bash-4.1$ cat marshaltest.py
import marshal

numlines = 1
numwords = 25

stream = open('fails.mar','wb')
marshal.dump(numlines, stream)
marshal.dump(numwords, stream)
stream.close()

tmpstream = open('fails.mar', 'rb')
value1 = marshal.load(tmpstream)
value2 = marshal.load(tmpstream)

print(value1 == numlines)
print(value2 == numwords)


Here are the results of running this code

bash-4.1$ python2.7 marshaltest.py
True
True

bash-4.1$ python3.1 marshaltest.py
Traceback (most recent call last):
  File "marshaltest.py", line 13, in <module>
    value2 = marshal.load(tmpstream)
EOFError: EOF read where object expected

Interestingly the file created by using Python 3.1 is readable by both
Python 2.7 as well as Python 2.6 and both objects are successfully
read.

Cheers,
raj