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/usr/lib/valgrind/python3.supp is in python3 3.2.3-0ubuntu1.

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#
# This is a valgrind suppression file that should be used when using valgrind.
#
# ---------------------------------------------------------------------------
# Debian note:
# The file Misc/valgrind-python.supp is placed in an modified form into the
# directory /usr/lib/valgrind as python.supp. There's no need to to add it
# with the --suppressions option.
# The unmodified file is found in /usr/share/doc/python2.4/
#
# The python2.4-dbg build has been compiled with -DPy_USING_MEMORY_DEBUGGER
# so you can safely comment out the suppressions for PyObject_Free and
# PyObject_Realloc.
# ---------------------------------------------------------------------------

#  Here's an example of running valgrind:
#
#	cd python/dist/src
#	valgrind --tool=memcheck --suppressions=Misc/valgrind-python.supp \
#		./python -E -tt ./Lib/test/regrtest.py -u bsddb,network
#
# You must edit Objects/obmalloc.c and uncomment Py_USING_MEMORY_DEBUGGER
# to use the preferred suppressions with Py_ADDRESS_IN_RANGE.
#
# If you do not want to recompile Python, you can uncomment
# suppressions for PyObject_Free and PyObject_Realloc.
#
# See /usr/share/doc/python2.4/README.valgrind for more information.

# all tool names: Addrcheck,Memcheck,cachegrind,helgrind,massif
{
   ADDRESS_IN_RANGE/Invalid read of size 4
   Memcheck:Addr4
   fun:Py_ADDRESS_IN_RANGE
}

{
   ADDRESS_IN_RANGE/Invalid read of size 4
   Memcheck:Value4
   fun:Py_ADDRESS_IN_RANGE
}

{
   ADDRESS_IN_RANGE/Conditional jump or move depends on uninitialised value
   Memcheck:Cond
   fun:Py_ADDRESS_IN_RANGE
}

{
   ADDRESS_IN_RANGE/Invalid read of size 4
   Memcheck:Addr4
   fun:PyObject_Free
}

{
   ADDRESS_IN_RANGE/Invalid read of size 4
   Memcheck:Value4
   fun:PyObject_Free
}

{
   ADDRESS_IN_RANGE/Conditional jump or move depends on uninitialised value
   Memcheck:Cond
   fun:PyObject_Free
}

{
   ADDRESS_IN_RANGE/Invalid read of size 4
   Memcheck:Addr4
   fun:PyObject_Realloc
}

{
   ADDRESS_IN_RANGE/Invalid read of size 4
   Memcheck:Value4
   fun:PyObject_Realloc
}

{
   ADDRESS_IN_RANGE/Conditional jump or move depends on uninitialised value
   Memcheck:Cond
   fun:PyObject_Realloc
}