Issue2290

Setting of attributes of sys module raises internal exceptions (java.lang.IllegalAccessException) in case of some attributes.
Amongst non-internal exceptions, there is inconsistency: AttributeError, TypeError.

$ cat set_attributes_of_sys_module.py
import sys
import traceback
for x in dir(sys):
  try:
    setattr(sys, x, getattr(sys, x))
  except:
    print("\x1B[1;31mSetting of sys.%s failed\x1B[0m" % x)
    traceback.print_exc()
  else:
    print("\x1B[1;32mSetting of sys.%s succeeded\x1B[0m" % x)
$ 

CPython:

$ python2.7 set_attributes_of_sys_module.py
Setting of sys.__displayhook__ succeeded
Setting of sys.__doc__ succeeded
Setting of sys.__excepthook__ succeeded
Setting of sys.__name__ succeeded
Setting of sys.__package__ succeeded
Setting of sys.__stderr__ succeeded
Setting of sys.__stdin__ succeeded
Setting of sys.__stdout__ succeeded
Setting of sys._clear_type_cache succeeded
Setting of sys._current_frames succeeded
Setting of sys._getframe succeeded
Setting of sys._mercurial succeeded
Setting of sys.api_version succeeded
Setting of sys.argv succeeded
Setting of sys.builtin_module_names succeeded
Setting of sys.byteorder succeeded
Setting of sys.call_tracing succeeded
Setting of sys.callstats succeeded
Setting of sys.copyright succeeded
Setting of sys.displayhook succeeded
Setting of sys.dont_write_bytecode succeeded
Setting of sys.exc_clear succeeded
Setting of sys.exc_info succeeded
Setting of sys.exc_type succeeded
Setting of sys.excepthook succeeded
Setting of sys.exec_prefix succeeded
Setting of sys.executable succeeded
Setting of sys.exit succeeded
Setting of sys.flags succeeded
Setting of sys.float_info succeeded
Setting of sys.float_repr_style succeeded
Setting of sys.getcheckinterval succeeded
Setting of sys.getdefaultencoding succeeded
Setting of sys.getdlopenflags succeeded
Setting of sys.getfilesystemencoding succeeded
Setting of sys.getprofile succeeded
Setting of sys.getrecursionlimit succeeded
Setting of sys.getrefcount succeeded
Setting of sys.getsizeof succeeded
Setting of sys.gettrace succeeded
Setting of sys.hexversion succeeded
Setting of sys.long_info succeeded
Setting of sys.maxint succeeded
Setting of sys.maxsize succeeded
Setting of sys.maxunicode succeeded
Setting of sys.meta_path succeeded
Setting of sys.modules succeeded
Setting of sys.path succeeded
Setting of sys.path_hooks succeeded
Setting of sys.path_importer_cache succeeded
Setting of sys.platform succeeded
Setting of sys.prefix succeeded
Setting of sys.py3kwarning succeeded
Setting of sys.setcheckinterval succeeded
Setting of sys.setdlopenflags succeeded
Setting of sys.setprofile succeeded
Setting of sys.setrecursionlimit succeeded
Setting of sys.settrace succeeded
Setting of sys.stderr succeeded
Setting of sys.stdin succeeded
Setting of sys.stdout succeeded
Setting of sys.subversion succeeded
Setting of sys.version succeeded
Setting of sys.version_info succeeded
Setting of sys.warnoptions succeeded

Jython:

$ jython2.7 set_attributes_of_sys_module.py
Setting of sys.JYTHON_DEV_JAR failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.String field org.python.core.PySystemState.JYTHON_DEV_JAR to java.lang.String
Setting of sys.JYTHON_JAR failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.String field org.python.core.PySystemState.JYTHON_JAR to java.lang.String
Setting of sys.PYTHON_CACHEDIR failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.String field org.python.core.PySystemState.PYTHON_CACHEDIR to java.lang.String
Setting of sys.PYTHON_CACHEDIR_SKIP failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.String field org.python.core.PySystemState.PYTHON_CACHEDIR_SKIP to java.lang.String
Setting of sys.PYTHON_CONSOLE_ENCODING failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.String field org.python.core.PySystemState.PYTHON_CONSOLE_ENCODING to java.lang.String
Setting of sys.PYTHON_IO_ENCODING failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.String field org.python.core.PySystemState.PYTHON_IO_ENCODING to java.lang.String
Setting of sys.PYTHON_IO_ERRORS failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.String field org.python.core.PySystemState.PYTHON_IO_ERRORS to java.lang.String
Setting of sys.__delattr__ succeeded
Setting of sys.__dict__ failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
TypeError: readonly attribute
Setting of sys.__displayhook__ succeeded
Setting of sys.__excepthook__ succeeded
Setting of sys.__findattr_ex__ succeeded
Setting of sys.__name__ succeeded
Setting of sys.__new__ succeeded
Setting of sys.__rawdir__ succeeded
Setting of sys.__setattr__ succeeded
Setting of sys.__stderr__ succeeded
Setting of sys.__stdin__ succeeded
Setting of sys.__stdout__ succeeded
Setting of sys._getframe succeeded
Setting of sys._jy_console succeeded
Setting of sys._mercurial failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyTuple field org.python.core.PySystemState._mercurial to org.python.core.PyTuple
Setting of sys._systemRestart succeeded
Setting of sys.add_classdir succeeded
Setting of sys.add_extdir succeeded
Setting of sys.add_package succeeded
Setting of sys.argv succeeded
Setting of sys.builtin_module_names succeeded
Setting of sys.builtins succeeded
Setting of sys.byteorder failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyString field org.python.core.PySystemState.byteorder to org.python.core.PyString
Setting of sys.classDictInit succeeded
Setting of sys.classLoader succeeded
Setting of sys.cleanup succeeded
Setting of sys.close succeeded
Setting of sys.codecState failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
AttributeError: read-only attr: codecState
Setting of sys.copyright failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyObject field org.python.core.PySystemState.copyright to org.python.core.PyString
Setting of sys.currentWorkingDir succeeded
Setting of sys.defaultencoding failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
AttributeError: read-only attr: defaultencoding
Setting of sys.displayhook succeeded
Setting of sys.doInitialize succeeded
Setting of sys.dont_write_bytecode succeeded
Setting of sys.exc_clear succeeded
Setting of sys.exc_info succeeded
Setting of sys.excepthook succeeded
Setting of sys.exec_prefix failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
TypeError: readonly attribute
Setting of sys.executable succeeded
Setting of sys.exit succeeded
Setting of sys.filesystemencoding failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
AttributeError: read-only attr: filesystemencoding
Setting of sys.flags failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final java.lang.Class field org.python.core.PySystemState.flags to java.lang.Class
Setting of sys.float_info failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyObject field org.python.core.PySystemState.float_info to org.python.core.FloatInfo
Setting of sys.float_repr_style failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyString field org.python.core.PySystemState.float_repr_style to org.python.core.PyString
Setting of sys.getBaseProperties succeeded
Setting of sys.getBuiltin succeeded
Setting of sys.getBuiltins succeeded
Setting of sys.getClassLoader succeeded
Setting of sys.getCodecState succeeded
Setting of sys.getCurrentWorkingDir succeeded
Setting of sys.getDefaultBuiltins succeeded
Setting of sys.getFile succeeded
Setting of sys.getImportLock succeeded
Setting of sys.getPath succeeded
Setting of sys.getPathLazy succeeded
Setting of sys.getPlatform succeeded
Setting of sys.getSyspathJavaLoader succeeded
Setting of sys.getWarnoptions succeeded
Setting of sys.getdefaultencoding succeeded
Setting of sys.getfilesystemencoding succeeded
Setting of sys.getprofile succeeded
Setting of sys.getrecursionlimit succeeded
Setting of sys.gettrace succeeded
Setting of sys.hexversion failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final int field org.python.core.PySystemState.hexversion to java.lang.Integer
Setting of sys.importLock failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
AttributeError: read-only attr: importLock
Setting of sys.initialize succeeded
Setting of sys.isPackageCacheEnabled succeeded
Setting of sys.last_traceback succeeded
Setting of sys.last_type succeeded
Setting of sys.last_value succeeded
Setting of sys.long_info failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyObject field org.python.core.PySystemState.long_info to org.python.core.LongInfo
Setting of sys.maxint failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final int field org.python.core.PySystemState.maxint to java.lang.Integer
Setting of sys.maxsize failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final int field org.python.core.PySystemState.maxsize to java.lang.Integer
Setting of sys.maxunicode failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final int field org.python.core.PySystemState.maxunicode to java.lang.Integer
Setting of sys.meta_path succeeded
Setting of sys.minint failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final int field org.python.core.PySystemState.minint to java.lang.Integer
Setting of sys.modules succeeded
Setting of sys.modules_reloading succeeded
Setting of sys.packageManager failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
TypeError: readonly attribute
Setting of sys.path succeeded
Setting of sys.path_hooks succeeded
Setting of sys.path_importer_cache succeeded
Setting of sys.platform succeeded
Setting of sys.prefix succeeded
Setting of sys.ps1 succeeded
Setting of sys.ps2 succeeded
Setting of sys.py3kwarning succeeded
Setting of sys.recursionlimit succeeded
Setting of sys.refersDirectlyTo succeeded
Setting of sys.registerCloser succeeded
Setting of sys.registry failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
TypeError: readonly attribute
Setting of sys.setBuiltins succeeded
Setting of sys.setClassLoader succeeded
Setting of sys.setCurrentWorkingDir succeeded
Setting of sys.setPlatform succeeded
Setting of sys.setWarnoptions succeeded
Setting of sys.setprofile succeeded
Setting of sys.setrecursionlimit succeeded
Setting of sys.settrace succeeded
Setting of sys.shadow succeeded
Setting of sys.stderr succeeded
Setting of sys.stdin succeeded
Setting of sys.stdout succeeded
Setting of sys.subversion failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyTuple field org.python.core.PySystemState.subversion to org.python.core.PyTuple
Setting of sys.syspathJavaLoader failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
AttributeError: read-only attr: syspathJavaLoader
Setting of sys.toString succeeded
Setting of sys.traverse succeeded
Setting of sys.unregisterCloser succeeded
Setting of sys.version failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyString field org.python.core.PySystemState.version to org.python.core.PyString
Setting of sys.version_info failed
Traceback (most recent call last):
  File "set_attributes_of_sys_module.py", line 5, in <module>
    setattr(sys, x, getattr(sys, x))
IllegalAccessException: java.lang.IllegalAccessException: Can not set static final org.python.core.PyTuple field org.python.core.PySystemState.version_info to org.python.core.PyTuple

Agreed, these should be raised as AttributeError instead of java.lang.IllegalAccessException

Should be an easy fix in PySystemState#__setattr__ (and also __delattr__)

Defer to 2.7.1