directory to sys.path when running from a build directory.  That has
proven to be problematic for several standard library modules with
C extension modules whose builds can fail on some platforms.

Closes #20537: logging methods now accept an exception instance as well as a Boolean value or exception tuple. Thanks to Yury Selivanov for the patch.

when it is run with pythonw.exe.

Documented that Tk.report_callback_exception() is purposed to be overriden in
applications.

when it is run with pythonw.exe.

Documented that Tk.report_callback_exception() is purposed to be overriden in
applications.

Issue #20334. Thanks to Antony Lee for bug report & initial patch.

Both compileall.compile_dir() and the CLI for compileall now allow for
specifying how many workers to use (or 0 to use all CPUs).

Thanks to Claudiu Popa for the patch.

The PyMem_Malloc(size) function has a well defined behaviour: if size is 0, a
pointer different than NULL is returned. PyMem_Malloc() allocations are
tracked by tracemalloc, attemptckalloc() allocations are not tracked.

It was failed when run with non-empty current directory.

character instead of truncate it.  Based on patch by Victor Stinner.

character instead of truncate it.  Based on patch by Victor Stinner.

 subdirectories using the "**" pattern.

empty string or tuple argument.

On some platforms Tcl memory allocator returns NULL when allocating zero-sized
block of memory.

empty string or tuple argument.

On some platforms Tcl memory allocator returns NULL when allocating zero-sized
block of memory.

ckalloc() causes the Tcl interpreter to panic, attemptckalloc() returns NULL
if the memory allocation fails.

ckalloc() causes the Tcl interpreter to panic, attemptckalloc() returns NULL
if the memory allocation fails.

failure.

self-contained, this change facilitates maintenance and the Python version
can be easily imported for experimentation.