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2020-08-04"pop from empty %q"Jeff Epler
Saves 12 bytes code on trinket m0
2020-08-04Combine similar strings to reduce size of translationsJeff Epler
This is a slight trade-off with code size, in places where a "_varg" mp_raise variant is now used. The net savings on trinket_m0 is just 32 bytes. It also means that the translation will include the original English text, and cannot be translated. These are usually names of Python types such as int, set, or dict or special values such as "inf" or "Nan".
2020-07-06Add license to some obvious files.Diego Elio Pettenò
2020-01-30Remove unneeded native cast.Scott Shawcroft
2020-01-27Fix subclassing of objects that are tested. Others may still be broken.Scott Shawcroft
2020-01-02remove unnecessary GCC pragmasRoy Hooper
2019-12-13Revert subscr signature changeRoy Hooper
2019-12-13push changesRoy Hooper
2019-11-23disable -Wunused-parameter on subscr functionsRoy Hooper
2019-11-23make ->subscr take an instance to pass when instance_subscr is called from ↵Roy Hooper
subscr.
2019-08-02WIP: rework of Characteristic properties; enhance Descriptor; not testedDan Halbert
2019-06-18Don't operate directly on bleio objects in shared-bindings: use common_halDan Halbert
routines instead. Changes made but not yet tested.
2019-02-04Check sequence multiply for length overflowScott Shawcroft
Fixes #1279
2019-01-14py changes for supporting superclass constructors that take kwargsScott Shawcroft
2018-08-09Two fixes and translate more strings.Scott Shawcroft
* Fix finding translations with escaped characters. * Add back \r to translations since its needed by screen.
2017-11-02Merge tag 'v1.9.3'Scott Shawcroft
Introduction of ports subdirectory where all ports are moved to The main change in this release is the introduction of a "ports/" subdirectory at the top-level of the repository, and all of the ports are moved here. In the process the "stmhal" port is renamed to "stm32" to better reflect the MCU that it targets. In addition, the STM32 CMSIS and HAL sources are moved to a new submodule called "stm32lib". The bytecode has changed in this release, compared to the previous release, and as a consequence the .mpy version number has increased to version 3. This means that scripts compiled with the previous mpy-cross must be recompiled to work with this new version. There have also been various enhancements and optimisations, such as: check for valid UTF-8 when creating str objects, support for reverse special binary operations like __radd__, full domain checking in the math module, support for floor-division and modulo in the viper emitter, and addition of stack overflow checking when executing a regex. The stm32 port sees improved support for F7 MCUs, addition of a new board B_L475E_IOT01A based on the STM32L475, and support for the Wiznet W5500 chipset along with improved socket behaviour. A detailed list of changes follows. py core: - objstr: startswith, endswith: check arg to be a string - nlrx86,x64: replace #define of defined() with portable macro usage - objtype: handle NotImplemented return from binary special methods - objtype: mp_obj_class_lookup: improve debug logging - map: remove unused new/free functions - make m_malloc_fail() have void return type, since it doesn't return - modstruct: in struct.pack, stop converting if there are no args left - modstruct: check and prevent buffer-read overflow in struct unpacking - modstruct: check and prevent buffer-write overflow in struct packing - nlrthumb: get working again on standard Thumb arch (ie not Thumb2) - objfloat: fix binary ops with incompatible objects - obj: fix comparison of float/complex NaN with itself - objtype: implement fallback for instance inplace special methods - objtuple: properly implement comparison with incompatible types - objstr: add check for valid UTF-8 when making a str from bytes - objlist: properly implement comparison with incompatible types - runtime0.h: move relational ops to the beginning of mp_binary_op_t - runtime0.h: move MP_BINARY_OP_DIVMOD to the end of mp_binary_op_t - objtype: make sure mp_binary_op_method_name has full size again - runtime0.h: put inplace arith ops in front of normal operations - builtinhelp: simplify code slightly by extracting object type - runtime: implement dispatch for "reverse op" special methods - nlrx86: fix building for Android/x86 - builtinhelp: change signature of help text var from pointer to array - runtime.h: change empty mp_warning macro so var-args are non empty - modbuiltins: implement abs() by dispatching to MP_UNARY_OP_ABS - {objfloat,objcomplex}: optimise MP_UNARY_OP_ABS by reusing variables - mpconfig.h: add note that using computed gotos in VM is not C99 - objstr: strip: don't strip "\0" by default - objexcept: prevent infinite recursion when allocating exceptions - stream: remove unnecessary checks for NULL return from vstr_add_len - vstr: raise a RuntimeError if fixed vstr buffer overflows - vm: use lowercase letter at start of exception message - persistentcode: define mp_raw_code_save_file() for any unix target - add config option to print warnings/errors to stderr - objfloat: support raising a negative number to a fractional power - objset: simplify set and frozenset by separating their locals dicts - objset: check that RHS of a binary op is a set/frozenset - objset: include the failed key in a KeyError raised from set.remove - objtype: change type of enum-to-qstr table to uint16_t to save space - objstr: make empty bytes object have a null-terminating byte - mpprint: only check for null string printing when NDEBUG not defined - objtype: clean up unary- and binary-op enum-to-qstr mapping tables - persistentcode: bump .mpy version number to version 3 - bc: update opcode_format_table to match the bytecode - modmath: add full checks for math domain errors - modmath: convert log2 macro into a function - formatfloat: don't print the negative sign of a NaN value - formatfloat: use standard isinf, isnan funcs instead of custom ones - modbuiltins: use existing utf8_get_char helper in builtin ord func - emitnative: implement floor-division and modulo for viper emitter - objtype: use CPython compatible method name for sizeof - objtype: fit qstrs for special methods in byte type - objtype: define all special methods if requested - objtype: introduce MICROPY_PY_ALL_INPLACE_SPECIAL_METHODS extmod: - modubinascii: only include uzlib/tinf.h when it's really needed - modussl_mbedtls: allow to compile with MBEDTLS_DEBUG_C disabled - machine_pinbase: put PinBase singleton in ROM - re1.5: upgrade to v0.8.2, adds hook for stack overflow checking - modure: add stack overflow checking when executing a regex - uos_dupterm: update uos.dupterm() and helper funcs to have index - uos_dupterm: swallow any errors from dupterm closing the stream - vfs: replace VLA in proxy func with small, static sized array - modussl: add finaliser support for ussl objects - modussl_mbedtls: allow to compile with unix coverage build lib: - add new submodule, stm32lib containing STM32 CMSIS and HAL source - embed/abort_: use mp_raise_msg helper function - libm: fix tanhf so that it correctly handles +/- infinity args - libm: remove implementation of log2f, use MP_NEED_LOG2 instead - axtls: update, support for SSL_EAGAIN return code - berkeley-db-1.xx: update, allow to override MINCACHE, DEFPSIZE drivers: - memory/spiflash: change from hard-coded soft SPI to generic SPI - display/ssd1306.py: improve performance of graphics methods - nrf24l01: make nRF24L01 test script more portable - display/ssd1306: implement SSD1306_I2C poweron method - display/ssd1306: make poweron() work the same with SSD1306_SPI - wiznet5k: improve the performance of socket ops with threading - wiznet5k: get low-level W5500 driver working tools: - upip: upgrade to 1.2.2 - pyboard: use repr() when quoting data in error messages - pyboard: update docstring for additional device support tests: - object_new: better messages, check user __new__() method - class_new: add checks for __init__ being called and other improvements - class_new: add another testcase for __new__/__init__ interaction - class_inplace_op: test for inplace op fallback to normal one - run-bench-tests: update locations of executables, now in ports/ - class_reverse_op: test for reverse arith ops special methods - run-tests: skip class_inplace_op for minimal profile - run-tests: fix copy-paste mistake in var name - cpydiff: add cases for locals() discrepancies - extmod: add test for ure regexes leading to infinite recursion - extmod: add test for '-' in character class in regex - run-tests: close device under test using "finally" - net_inet: update tls test to work with CPython and incl new site unix port: - rename modsocket.c to modusocket.c - modusocket: remove #if MICROPY_SOCKET_EXTRA code blocks - enable MICROPY_PY_REVERSE_SPECIAL_METHODS stm32 port: - modmachine: make machine.bootloader() work when MPU is enabled - modmachine: improve support for sleep/deepsleep on F7 MCUs - compute PLL freq table during build instead of at run time - modmachine: for F7 MCU, save power by reducing internal volt reg - boards/pllvalues.py: make script work with both Python 2 and 3 - Makefile: use lib/stm32lib instead of local cmsis and hal files - remove cmsis and hal files, they are now a submodule - Makefile: automatically fetch stm32lib submodule if needed - update to new STM Cube HAL library - fix clock initialisation of L4 MCUs - rename stmhal port directory to stm32 - remove unused usbd_msc.c file - boards: change remaining stm32f4xx_hal_conf.h to unix line ending - boards: change linker scripts to use "K" instead of hex byte size - boards: fix I2C1 pin mapping on NUCLEO_F401RE/F411RE boards - i2c: when scanning for I2C devices only do 1 probe per address - modnwwiznet5k: release the GIL on blocking network operations - boards: add new board B_L475E_IOT01A based on STM32L475 - make-stmconst.py: make sure mpz const data lives in ROM - timer: make pyb.Timer() instances persistent - mpconfigport.h: add configuration for max periphs on L4 series - usbdev: make the USBD callback struct const so it can go in ROM - usbdev: change static function variable to non-static - usbdev: put all CDC state in a struct - usbdev: put all HID state in a struct - usbdev: simplify CDC tx/rx buffer passing - usbdev: simplify HID tx/rx buffer passing - usbdev/core: add state parameter to all callback functions - usbdev: put all state for the USB device driver in a struct - usbdev: simplify pointers to MSC state and block dev operations - usbdev: merge all global USB device state into a single struct - usbdev: make device descriptor callbacks take a state pointer - usbdev: move all the USB device descriptor state into its struct - timer: enable ARPE so that timer freq can be changed smoothly - modnwwiznet5k: get the IP address of an established socket - boards: fix typos in stm32f767_af.csv table - usbd_cdc_interface: don't reset CDC output buf on initialisation - modnwwiznet5k: implement WIZNET5K.isconnected() method - modusocket: make getaddrinfo() work when passed an IP address - modusocket: return OSError(-2) if getaddrinfo fails - mpconfigport.h: add MICROPY_THREAD_YIELD() macro - modnwwiznet5k: add support for W5500 Ethernet chip - modnwwiznet5k: increase SPI bus speed to 42MHz - modnwwiznet5k: implement stream ioctl for the Wiznet driver - mphalport: improve efficiency of mp_hal_stdout_tx_strn_cooked - make uos.dupterm() conform to specs by using extmod version cc3200 port: - enable micropython.kbd_intr() method - use standard implementation of keyboard interrupt esp8266 port: - rename axtls_helpers.c to posix_helpers.c - posix_helpers: set ENOMEM on memory alloc failure - set DEFPSIZE=1024, MINCACHE=3 for "btree" module - esp_mphal: send data in chunks to mp_uos_dupterm_tx_strn - modnetwork: add "bssid" keyword arg to WLAN.connect() method - modules/webrepl_setup: add info about allowed password length zephyr port: - Makefile: revamp "test" target after ports were moved to ports/ - use CONFIG_NET_APP_SETTINGS to setup initial network addresses - switch to interrupt-driven pull-style console pic16bit port: - add definition of SEEK_SET to unistd.h docs: - pyboard/tutorial: add "timeout=0" to UART in pass-through example - more xrefs to "MicroPython port" in glossary - library/network: fix ref to "socket" module (should be "usocket") - machine.Signal: improve style/grammar and add usage example - library: add description of "index" parameter to uos.dupterm() - library/micropython: fix typo in RST formatting - library/framebuf.rst: generalise constructor to all colour formats - btree: describe page caching policy of the underlying implementation - esp8266/tutorial: update neopixel with example of using 4 bbp - library/network: clarify usage of "bssid" arg in connect() method - pyboard/quickref: add info for Switch, RTC, CAN, Accel classes - pyboard/tutorial: update now that yellow LED also supports PWM - esp8266/quickref: add quickref info for RTC class - library: add missing cross-ref links for classes in pyb module - library/network: update docs to state that W5500 is supported - uselect: document one-shot polling mode - usocket: elaborate descriptions - usocket: document inet_ntop(), inet_pton() - library/network: add dhcp_hostname parameter - reference/isr_rules: minor typo correction - ussl: fix module name refs and use "MicroPython port" term - esp8266/general: add section on TLS limitations - usocket: document that settimeout() isn't supported by all ports - ure: add "|" (alternative) to the list of supported operators - reference/isr_rules.rst: add tutorial on use of micropython.schedule() travis: - use --upgrade when pip is installing cpp-coveralls - update build command now that stm32 Wiznet config has changed examples: - hwconfig_console: add .on()/.off() methods all: - convert mp_uint_t to mp_unary_op_t/mp_binary_op_t where appropriate - convert remaining "mp_uint_t n_args" to "size_t n_args" - make new ports/ sub-directory and move all ports there - update Makefiles and others to build with new ports/ dir layout - remove inclusion of internal py header files - use NULL instead of "" when calling mp_raise exception helpers README: - update "Dependencies" section - add explicit section on contributing - add gcc and arm-none-eabi-newlib to list of required components .gitattributes: - remove obsolete entries for stmhal/hal, stmhal/cmsis - add entries for files that will move to ports/ dir
2017-10-24Merge commit 'f869d6b2e339c04469c6c9ea3fb2fabd7bbb2d8c' into nrf2_mergeScott Shawcroft
This is prep for merging in the NRF5 pull request.
2017-10-24all: Use NULL instead of "" when calling mp_raise exception helpers.Damien George
This is the established way of doing it and reduces code size by a little bit.
2017-10-04all: Remove inclusion of internal py header files.Damien George
Header files that are considered internal to the py core and should not normally be included directly are: py/nlr.h - internal nlr configuration and declarations py/bc0.h - contains bytecode macro definitions py/runtime0.h - contains basic runtime enums Instead, the top-level header files to include are one of: py/obj.h - includes runtime0.h and defines everything to use the mp_obj_t type py/runtime.h - includes mpstate.h and hence nlr.h, obj.h, runtime0.h, and defines everything to use the general runtime support functions Additional, specific headers (eg py/objlist.h) can be included if needed.
2017-09-07py/objlist: Properly implement comparison with incompatible types.Paul Sokolovsky
Should raise TypeError, unless it's (in)equality comparison.
2017-08-29all: Convert mp_uint_t to mp_unary_op_t/mp_binary_op_t where appropriateDamien George
The unary-op/binary-op enums are already defined, and there are no arithmetic tricks used with these types, so it makes sense to use the correct enum type for arguments that take these values. It also reduces code size quite a bit for nan-boxing builds.
2017-08-25Initial merge of micropython v1.9.2 into circuitpython 2.0.0 (in ↵Dan Halbert
development) master. cpx build compiles and loads and works in repl; test suite not run yet esp8266 not tested yet
2017-08-13all: Raise exceptions via mp_raise_XXXJavier Candeira
- Changed: ValueError, TypeError, NotImplementedError - OSError invocations unchanged, because the corresponding utility function takes ints, not strings like the long form invocation. - OverflowError, IndexError and RuntimeError etc. not changed for now until we decide whether to add new utility functions.
2017-08-11py/modsys: Initial implementation of sys.getsizeof().Paul Sokolovsky
Implemented as a new MP_UNARY_OP. This patch adds support lists, dicts and instances.
2017-07-31all: Use the name MicroPython consistently in commentsAlexander Steffen
There were several different spellings of MicroPython present in comments, when there should be only one.
2017-06-20Merge tag 'v1.9.1'2.0.0-alpha.0Scott Shawcroft
Fixes for stmhal USB mass storage, lwIP bindings and VFS regressions This release provides an important fix for the USB mass storage device in the stmhal port by implementing the SCSI SYNCHRONIZE_CACHE command, which is now require by some Operating Systems. There are also fixes for the lwIP bindings to improve non-blocking sockets and error codes. The VFS has some regressions fixed including the ability to statvfs the root. All changes are listed below. py core: - modbuiltins: add core-provided version of input() function - objstr: catch case of negative "maxsplit" arg to str.rsplit() - persistentcode: allow to compile with complex numbers disabled - objstr: allow to compile with obj-repr D, and unicode disabled - modsys: allow to compile with obj-repr D and PY_ATTRTUPLE disabled - provide mp_decode_uint_skip() to help reduce stack usage - makeqstrdefs.py: make script run correctly with Python 2.6 - objstringio: if created from immutable object, follow copy on write policy extmod: - modlwip: connect: for non-blocking mode, return EINPROGRESS - modlwip: fix error codes for duplicate calls to connect() - modlwip: accept: fix error code for non-blocking mode - vfs: allow to statvfs the root directory - vfs: allow "buffering" and "encoding" args to VFS's open() - modframebuf: fix signed/unsigned comparison pendantic warning lib: - libm: use isfinite instead of finitef, for C99 compatibility - utils/interrupt_char: remove support for KBD_EXCEPTION disabled tests: - basics/string_rsplit: add tests for negative "maxsplit" argument - float: convert "sys.exit()" to "raise SystemExit" - float/builtin_float_minmax: PEP8 fixes - basics: convert "sys.exit()" to "raise SystemExit" - convert remaining "sys.exit()" to "raise SystemExit" unix port: - convert to use core-provided version of built-in import() - Makefile: replace references to make with $(MAKE) windows port: - convert to use core-provided version of built-in import() qemu-arm port: - Makefile: adjust object-file lists to get correct dependencies - enable micropython.mem_*() functions to allow more tests stmhal port: - boards: enable DAC for NUCLEO_F767ZI board - add support for NUCLEO_F446RE board - pass USB handler as parameter to allow more than one USB handler - usb: use local USB handler variable in Start-of-Frame handler - usb: make state for USB device private to top-level USB driver - usbdev: for MSC implement SCSI SYNCHRONIZE_CACHE command - convert from using stmhal's input() to core provided version cc3200 port: - convert from using stmhal's input() to core provided version teensy port: - convert from using stmhal's input() to core provided version esp8266 port: - Makefile: replace references to make with $(MAKE) - Makefile: add clean-modules target - convert from using stmhal's input() to core provided version zephyr port: - modusocket: getaddrinfo: Fix mp_obj_len() usage - define MICROPY_PY_SYS_PLATFORM (to "zephyr") - machine_pin: use native Zephyr types for Zephyr API calls docs: - machine.Pin: remove out_value() method - machine.Pin: add on() and off() methods - esp8266: consistently replace Pin.high/low methods with .on/off - esp8266/quickref: polish Pin.on()/off() examples - network: move confusingly-named cc3200 Server class to its reference - uos: deconditionalize, remove minor port-specific details - uos: move cc3200 port legacy VFS mounting functions to its ref doc - machine: sort machine classes in logical order, not alphabetically - network: first step to describe standard network class interface examples: - embedding: use core-provided KeyboardInterrupt object
2017-03-29py: Convert mp_uint_t to size_t for tuple/list accessors.Damien George
This patch changes mp_uint_t to size_t for the len argument of the following public facing C functions: mp_obj_tuple_get mp_obj_list_get mp_obj_get_array These functions take a pointer to the len argument (to be filled in by the function) and callers of these functions should update their code so the type of len is changed to size_t. For ports that don't use nan-boxing there should be no change in generate code because the size of the type remains the same (word sized), and in a lot of cases there won't even be a compiler warning if the type remains as mp_uint_t. The reason for this change is to standardise on the use of size_t for variables that count memory (or memory related) sizes/lengths. It helps builds that use nan-boxing.
2017-03-23py: Use size_t as len argument and return type of mp_get_index.Damien George
These values are used to compute memory addresses and so size_t is the more appropriate type to use.
2017-02-24Correct name of mp_raise_NotImplementedError to make error name.Scott Shawcroft
2017-02-24Switch exception throwing to mp_raise helpers. It saves a little code space ↵Scott Shawcroft
each time to share the call.
2017-02-20py/objlist: For list slice assignment, allow RHS to be a tuple or list.Damien George
Before this patch, assigning anything other than a list would lead to a crash. Fixes issue #2886.
2017-02-16py: De-optimise some uses of mp_getiter, so they don't use the C stack.Damien George
In these cases the heap is anyway used to create a new object so no real need to use the C stack for iterating. It saves a few bytes of code size.
2017-02-16py: Add iter_buf to getiter type method.Damien George
Allows to iterate over the following without allocating on the heap: - tuple - list - string, bytes - bytearray, array - dict (not dict.keys, dict.values, dict.items) - set, frozenset Allows to call the following without heap memory: - all, any, min, max, sum TODO: still need to allocate stack memory in bytecode for iter_buf.
2017-02-16py/objlist: Convert mp_uint_t to size_t where appropriate.Damien George
2016-10-17py: Use mp_raise_msg helper function where appropriate.Damien George
Saves the following number of bytes of code space: 176 for bare-arm, 352 for minimal, 272 for unix x86-64, 140 for stmhal, 120 for esp8266.
2016-08-12py: Get rid of assert() in method argument checking functions.Paul Sokolovsky
Checks for number of args removes where guaranteed by function descriptor, self checking is replaced with mp_check_self(). In few cases, exception is raised instead of assert.
2016-01-13py: Use new code pattern for parsing kw args with mp_arg_parse_all.Damien George
Makes code easier to read and more maintainable.
2016-01-11py: Change first arg of type.make_new from mp_obj_t to mp_obj_type_t*.Damien George
The first argument to the type.make_new method is naturally a uPy type, and all uses of this argument cast it directly to a pointer to a type structure. So it makes sense to just have it a pointer to a type from the very beginning (and a const pointer at that). This patch makes such a change, and removes all unnecessary casting to/from mp_obj_t.
2016-01-11py: Change type signature of builtin funs that take variable or kw args.Damien George
With this patch the n_args parameter is changed type from mp_uint_t to size_t.
2016-01-11py: Change type of .make_new and .call args: mp_uint_t becomes size_t.Damien George
This patch changes the type signature of .make_new and .call object method slots to use size_t for n_args and n_kw (was mp_uint_t. Makes code more efficient when mp_uint_t is larger than a machine word. Doesn't affect ports when size_t and mp_uint_t have the same size.
2016-01-03py: Use polymorphic iterator type where possible to reduce code size.Damien George
Only types whose iterator instances still fit in 4 machine words have been changed to use the polymorphic iterator. Reduces Thumb2 arch code size by 264 bytes.
2015-11-29py: Wrap all obj-ptr conversions in MP_OBJ_TO_PTR/MP_OBJ_FROM_PTR.Damien George
This allows the mp_obj_t type to be configured to something other than a pointer-sized primitive type. This patch also includes additional changes to allow the code to compile when sizeof(mp_uint_t) != sizeof(void*), such as using size_t instead of mp_uint_t, and various casts.
2015-11-29py: Add MP_ROM_* macros and mp_rom_* types and use them.Damien George
2015-10-11py: Rename MP_BOOL() to mp_obj_new_bool() for consistency in naming.Paul Sokolovsky
2015-08-02py/objlist: Make list += accept all arguments and add test.Damien George
2015-04-16py: Overhaul and simplify printf/pfenv mechanism.Damien George
Previous to this patch the printing mechanism was a bit of a tangled mess. This patch attempts to consolidate printing into one interface. All (non-debug) printing now uses the mp_print* family of functions, mainly mp_printf. All these functions take an mp_print_t structure as their first argument, and this structure defines the printing backend through the "print_strn" function of said structure. Printing from the uPy core can reach the platform-defined print code via two paths: either through mp_sys_stdout_obj (defined pert port) in conjunction with mp_stream_write; or through the mp_plat_print structure which uses the MP_PLAT_PRINT_STRN macro to define how string are printed on the platform. The former is only used when MICROPY_PY_IO is defined. With this new scheme printing is generally more efficient (less layers to go through, less arguments to pass), and, given an mp_print_t* structure, one can call mp_print_str for efficiency instead of mp_printf("%s", ...). Code size is also reduced by around 200 bytes on Thumb2 archs.
2015-03-25py: Cast mp_obj_t to concrete types explicitly.Paul Sokolovsky
mp_obj_t internal representation doesn't have to be a pointer to object, it can be anything. There's also a support for back-conversion in the form of MP_OBJ_UNCAST. This is kind of optimization/status quo preserver to minimize patching the existing code and avoid doing potentially expensive MP_OBJ_CAST over and over. But then one may imagine implementations where MP_OBJ_UNCAST is very expensive. But such implementations are unlikely interesting in practice.
2015-03-20objlist: list_reverse(): Fix typesafety error.Paul Sokolovsky
2015-02-27objarray: Implement array slice assignment.Paul Sokolovsky
This is rarely used feature which takes enough code to implement, so is controlled by MICROPY_PY_ARRAY_SLICE_ASSIGN config setting, default off. But otherwise it may be useful, as allows to update arbitrary-sized data buffers in-place. Slice is yet to implement, and actually, slice assignment implemented in such a way that RHS of assignment should be array of the exact same item typecode as LHS. CPython has it more relaxed, where RHS can be any sequence of compatible types (e.g. it's possible to assign list of int's to a bytearray slice). Overall, when all "slice write" features are implemented, it may cost ~1KB of code.
2015-02-27py: Fix adding of traceback so that it appends to existing info.Damien George
This makes exception traceback info self contained (ie doesn't rely on list object, which was a bit of a hack), reduces code size, and reduces RAM footprint of exception by eliminating the list object. Addresses part of issue #1126.