Back on python for the AMIGA again and discovered this little gem...

wisecracker · July 7, 2019, 10:21am

I am back on Python for the AMIGA again and discovered this little gem that exits the program:-
(If you search GOOGLE as 'os.sys.exit()' python nothing seems to appear.)

import os
os.sys.exit()

I know of the other four and how they apply but I have no idea whether this creates any zombies or memory holes or whatever.

import os
import sys
"""
sys.exit()
os._exit()
exit()
quit()
"""

Just thought you might like to know guys as I still code for the lowly AMIGA and its latest version of Python is an unreliable Version 2.4.6 and its earliest is 1.4.0 which I use a lot still...
The code in the top code block works from Version 1.4.0 on the AMIGA and an installed 3.5.2 on my MBP.

Neo · July 7, 2019, 10:30am

These are great posts! Thanks.

I used to love to program on the Amiga, including the years when I was a land surveyor and wrote a lot of land surveying programs on the Amiga (as well as a Tandy TRS 80 as I recall) which I used in my business, and your posts brings back fond, distant memories.

wisecracker · July 8, 2019, 11:46am

As an addendum to this thread assigning 'sys' to 'os.sys' opens up 'sys' without wasting namespace by importing 'sys' at all IF 'os' is already imported.
Demo code:

import os
print("")
print(dir(os.sys))
# import sys    # This is not needed if os is imported!

# Instead of taking up namespace by import[ing] sys, assign sys to os.sys in its place.
sys = os.sys

# A few simple 'sys' functions in action.
print("")
print(sys.platform)
print("")
print(sys.version)
print("")
print(sys.builtin_module_names)
print("")
sys.stdout.write("Hello unix.com!")
print("")
print("")
print(sys.modules)
print("")
sys.exit(10)

Results, OSX 10.14.3, default bash terminal calling python3.5...

Last login: Mon Jul  8 16:30:25 on ttys000
AMIGA:amiga~> cd Desktop/Code/Python
AMIGA:amiga~/Desktop/Code/Python> python3.5 os_sys.py

['__displayhook__', '__doc__', '__excepthook__', '__interactivehook__', '__loader__', '__name__', '__package__', '__spec__', '__stderr__', '__stdin__', '__stdout__', '_clear_type_cache', '_current_frames', '_debugmallocstats', '_getframe', '_home', '_mercurial', '_xoptions', 'abiflags', 'api_version', 'argv', 'base_exec_prefix', 'base_prefix', 'builtin_module_names', 'byteorder', 'call_tracing', 'callstats', 'copyright', 'displayhook', 'dont_write_bytecode', 'exc_info', 'excepthook', 'exec_prefix', 'executable', 'exit', 'flags', 'float_info', 'float_repr_style', 'get_coroutine_wrapper', 'getallocatedblocks', 'getcheckinterval', 'getdefaultencoding', 'getdlopenflags', 'getfilesystemencoding', 'getprofile', 'getrecursionlimit', 'getrefcount', 'getsizeof', 'getswitchinterval', 'gettrace', 'hash_info', 'hexversion', 'implementation', 'int_info', 'intern', 'is_finalizing', 'maxsize', 'maxunicode', 'meta_path', 'modules', 'path', 'path_hooks', 'path_importer_cache', 'platform', 'prefix', 'set_coroutine_wrapper', 'setcheckinterval', 'setdlopenflags', 'setprofile', 'setrecursionlimit', 'setswitchinterval', 'settrace', 'stderr', 'stdin', 'stdout', 'thread_info', 'version', 'version_info', 'warnoptions']

darwin

3.5.2 (v3.5.2:4def2a2901a5, Jun 26 2016, 10:47:25) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]

('_ast', '_codecs', '_collections', '_functools', '_imp', '_io', '_locale', '_operator', '_signal', '_sre', '_stat', '_string', '_symtable', '_thread', '_tracemalloc', '_warnings', '_weakref', 'atexit', 'builtins', 'errno', 'faulthandler', 'gc', 'itertools', 'marshal', 'posix', 'pwd', 'sys', 'time', 'xxsubtype', 'zipimport')

Hello unix.com!

{'zipimport': <module 'zipimport' (built-in)>, '_sitebuiltins': <module '_sitebuiltins' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/_sitebuiltins.py'>, 'encodings.latin_1': <module 'encodings.latin_1' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/encodings/latin_1.py'>, 'codecs': <module 'codecs' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/codecs.py'>, 'sre_compile': <module 'sre_compile' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/sre_compile.py'>, 'os': <module 'os' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/os.py'>, '_warnings': <module '_warnings' (built-in)>, '_signal': <module '_signal' (built-in)>, 'encodings': <module 'encodings' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/encodings/__init__.py'>, '_weakrefset': <module '_weakrefset' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/_weakrefset.py'>, 'builtins': <module 'builtins' (built-in)>, '_locale': <module '_locale' (built-in)>, '_imp': <module '_imp' (built-in)>, '_stat': <module '_stat' (built-in)>, 'os.path': <module 'posixpath' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/posixpath.py'>, 'sre_parse': <module 'sre_parse' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/sre_parse.py'>, 'genericpath': <module 'genericpath' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/genericpath.py'>, 'stat': <module 'stat' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/stat.py'>, 'sys': <module 'sys' (built-in)>, '_frozen_importlib_external': <module '_frozen_importlib_external' (frozen)>, '_codecs': <module '_codecs' (built-in)>, 'sysconfig': <module 'sysconfig' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/sysconfig.py'>, '_osx_support': <module '_osx_support' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/_osx_support.py'>, '_frozen_importlib': <module '_frozen_importlib' (frozen)>, '_sre': <module '_sre' (built-in)>, 'abc': <module 'abc' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/abc.py'>, 'encodings.aliases': <module 'encodings.aliases' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/encodings/aliases.py'>, '_bootlocale': <module '_bootlocale' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/_bootlocale.py'>, '_io': <module 'io' (built-in)>, 're': <module 're' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/re.py'>, 'marshal': <module 'marshal' (built-in)>, '_sysconfigdata': <module '_sysconfigdata' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/_sysconfigdata.py'>, 'copyreg': <module 'copyreg' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/copyreg.py'>, '_thread': <module '_thread' (built-in)>, 'encodings.utf_8': <module 'encodings.utf_8' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/encodings/utf_8.py'>, 'posixpath': <module 'posixpath' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/posixpath.py'>, 'io': <module 'io' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/io.py'>, 'sre_constants': <module 'sre_constants' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/sre_constants.py'>, 'errno': <module 'errno' (built-in)>, '__main__': <module '__main__' from 'os_sys.py'>, 'posix': <module 'posix' (built-in)>, '_weakref': <module '_weakref' (built-in)>, 'site': <module 'site' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site.py'>, '_collections_abc': <module '_collections_abc' from '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/_collections_abc.py'>}

AMIGA:amiga~/Desktop/Code/Python> echo $?
10
AMIGA:amiga~/Desktop/Code/Python> _