Update & removed outdated docs

doc/EN/python/bytecode_specification.md

@@ -0,0 +1,71 @@
+# Python bytecode specification
+
+## Format
+
+* 0~3 byte(u32): magic number (see common/bytecode.rs for details)
+* 4~7 byte(u32): 0 padding
+* 8~12 byte(u32): timestamp
+* 13~ byte(PyCodeObject): code object
+
+## PyCodeObject
+
+* 0     byte(u8): '0xe3' (prefix, this means code's 'c')
+* 01~04 byte(u32): number of args (co_argcount)
+* 05~08 byte(u32): number of position-only args (co_posonlyargcount)
+* 09~12 byte(u32): number of keyword-only args (co_kwonlyargcount)
+* 13~16 byte(u32): number of locals (co_nlocals)
+* 17~20 byte(u32): stack size (co_stacksize)
+* 21~24 byte(u32): flags (co_flags) ()
+* ?     byte: bytecode instructions, ends with '0x53', '0x0' (83, 0): RETURN_VALUE (co_code)
+* ?     byte(PyTuple): constants used in the code (co_consts)
+* ?     byte(PyTuple): names used in the code (co_names)
+* ?     byte(PyTuple): variable names defined in the code, include params (PyTuple) (co_varnames)
+* ?     byte(PyTuple): variables captured from the outer scope (co_freevars)
+* ?     byte(PyTuple): variables used in the inner closure (co_cellvars)
+* ?     byte(PyUnicode or PyShortAscii): file name, where it was loaded from (co_filename)
+* ?     byte(PyUnicode or PyShortAscii): the name of code itself, default is \<module\> (co_name)
+* ?~?+3 byte(u32): number of first line (co_firstlineno)
+* ?     byte(bytes): line table, represented by PyStringObject? (co_lnotab)
+
+## PyTupleObject
+
+* 0     byte: 0x29 (means ')')
+* 01~04 byte(u32): number of tuple items
+* ?     byte(PyObject): items
+
+## PyStringObject
+
+* If I use a character other than ascii, does it become PyUnicode?
+* "あ", "𠮷", and "α" are PyUnicode (no longer used?)
+
+* 0     byte: 0x73 (means 's')
+* 1~4   byte: length of string
+* 5~    byte: payload
+
+## PyUnicodeObject
+
+* 0     byte: 0x75 (means 'u')
+* 1~4   byte: length of string
+* 5~    byte: payload
+
+## PyShortAsciiObject
+
+* This is called short, but even if there are more than 100 characters, this will still short
+* or rather, there is no ascii that is not short (is short a data type?)
+
+* 0     byte: 0xFA (means 'z')
+* 1~4   byte: length of string
+* 5~    byte: payload
+
+## PyInternedObject
+
+* interned objects are registered in a dedicated map and can be compared with is
+* String, for example, can be compared in constant time regardless of its length
+
+* 0     byte: 0x74 (means 't')
+
+## PyShortAsciiInternedObject
+
+* 0     byte: 0xDA (means 'Z')
+* 1~4   byte: length of string
+* 5~    byte: payload