eryksun added the comment:
> --> import sys
> --> sys.exit(2**63)
> 9223372036854775808
The above is only Python 2.x behavior. On Windows, sys.maxint is 2147483647
(even for 64-bit Windows), so 2**63 is a Python long. Thus handle_system_exit
takes the PyFile_WriteObject branch, with the actual exit code set to 1.
>>> import sys
>>> sys.exit(2**63)
9223372036854775808
C:\>echo %errorlevel%
1
In Python 3, PyLong_AsLong overflows for any value bigger than LONG_MAX, which
sets the result to -1, i.e. 32-bit 0xFFFFFFFF, with overflow set.
handle_system_exit ignores the overflow exception, so any exit code larger than
0x7FFFFFFF (2**31-1) is returned as 0xFFFFFFFF (2**32-1).
>>> cmd = '%s -c "import sys;sys.exit(%%d)"' % sys.executable
>>> subprocess.call(cmd % (2**31-1))
2147483647
>>> subprocess.call(cmd % (2**31))
4294967295
>>> subprocess.call(cmd % (2**63))
4294967295
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<http://bugs.python.org/issue24052>
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