STINNER Victor added the comment:

Here is a first patch adding the following functions:

  void* PyMem_RawCalloc(size_t n);
  void* PyMem_Calloc(size_t n);
  void* PyObject_Calloc(size_t n);
  PyObject* _PyObject_GC_Calloc(size_t);

It adds the following field after malloc field to PyMemAllocator structure:

  void* (*calloc) (void *ctx, size_t size);

It changes the tracemalloc module to trace "calloc" allocations, add new tests 
and document new functions.

The patch also contains an important change: PyType_GenericAlloc() uses calloc 
instead of malloc+memset(0). It may be faster, I didn't check.

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keywords: +patch
Added file: http://bugs.python.org/file34897/calloc.patch

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<http://bugs.python.org/issue21233>
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