FM / python3.8

/snap/core20/2769/usr/lib/python3.8

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
distutils/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
lib2to3/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pydoc_data/	-	0755	rm
sqlite3/	-	0755	rm
test/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	4489	0644	edit dl rm
aifc.py	32814	0644	edit dl rm
antigravity.py	477	0644	edit dl rm
argparse.py	96311	0644	edit dl rm
ast.py	19234	0644	edit dl rm
asynchat.py	11328	0644	edit dl rm
asyncore.py	20094	0644	edit dl rm
base64.py	20382	0755	edit dl rm
bdb.py	32056	0644	edit dl rm
binhex.py	13954	0644	edit dl rm
bisect.py	2214	0644	edit dl rm
bz2.py	12558	0644	edit dl rm
calendar.py	24832	0644	edit dl rm
cgi.py	33932	0755	edit dl rm
cgitb.py	12096	0644	edit dl rm
chunk.py	5435	0644	edit dl rm
cmd.py	14860	0644	edit dl rm
code.py	10622	0644	edit dl rm
codecs.py	36667	0644	edit dl rm
codeop.py	6330	0644	edit dl rm
colorsys.py	4064	0644	edit dl rm
compileall.py	13678	0644	edit dl rm
configparser.py	54374	0644	edit dl rm
contextlib.py	24995	0644	edit dl rm
contextvars.py	129	0644	edit dl rm
copy.py	8661	0644	edit dl rm
copyreg.py	7135	0644	edit dl rm
cProfile.py	6998	0755	edit dl rm
crypt.py	3610	0644	edit dl rm
csv.py	16144	0644	edit dl rm
dataclasses.py	49973	0644	edit dl rm
datetime.py	88287	0644	edit dl rm
decimal.py	320	0644	edit dl rm
difflib.py	84058	0644	edit dl rm
dis.py	20570	0644	edit dl rm
doctest.py	104543	0644	edit dl rm
dummy_threading.py	2815	0644	edit dl rm
enum.py	38136	0644	edit dl rm
filecmp.py	9830	0644	edit dl rm
fileinput.py	14709	0644	edit dl rm
fnmatch.py	4079	0644	edit dl rm
formatter.py	15143	0644	edit dl rm
fractions.py	24329	0644	edit dl rm
ftplib.py	35129	0644	edit dl rm
functools.py	37406	0644	edit dl rm
genericpath.py	4975	0644	edit dl rm
getopt.py	7489	0644	edit dl rm
getpass.py	5994	0644	edit dl rm
gettext.py	27565	0644	edit dl rm
glob.py	5697	0644	edit dl rm
gzip.py	21413	0644	edit dl rm
hashlib.py	9730	0644	edit dl rm
heapq.py	22877	0644	edit dl rm
hmac.py	6629	0644	edit dl rm
imaplib.py	53775	0644	edit dl rm
imghdr.py	3808	0644	edit dl rm
imp.py	10536	0644	edit dl rm
inspect.py	118550	0644	edit dl rm
io.py	3541	0644	edit dl rm
ipaddress.py	76336	0644	edit dl rm
keyword.py	945	0644	edit dl rm
LICENSE.txt	13925	0644	edit dl rm
linecache.py	5330	0644	edit dl rm
locale.py	78195	0644	edit dl rm
lzma.py	12983	0644	edit dl rm
mailbox.py	78661	0644	edit dl rm
mailcap.py	9067	0644	edit dl rm
mimetypes.py	21664	0644	edit dl rm
modulefinder.py	24430	0644	edit dl rm
netrc.py	5566	0644	edit dl rm
nntplib.py	43261	0644	edit dl rm
ntpath.py	25814	0644	edit dl rm
nturl2path.py	2887	0644	edit dl rm
numbers.py	10244	0644	edit dl rm
opcode.py	5808	0644	edit dl rm
operator.py	10711	0644	edit dl rm
optparse.py	60369	0644	edit dl rm
os.py	38995	0644	edit dl rm
pathlib.py	52610	0644	edit dl rm
pdb.py	62738	0755	edit dl rm
pickle.py	64467	0644	edit dl rm
pickletools.py	93486	0644	edit dl rm
pipes.py	8916	0644	edit dl rm
pkgutil.py	21461	0644	edit dl rm
platform.py	40425	0755	edit dl rm
plistlib.py	32460	0644	edit dl rm
poplib.py	15200	0644	edit dl rm
posixpath.py	15500	0644	edit dl rm
pprint.py	21484	0644	edit dl rm
profile.py	23534	0755	edit dl rm
pstats.py	27345	0644	edit dl rm
pty.py	4807	0644	edit dl rm
pyclbr.py	15255	0644	edit dl rm
pydoc.py	106863	0755	edit dl rm
py_compile.py	8148	0644	edit dl rm
queue.py	11356	0644	edit dl rm
quopri.py	7252	0755	edit dl rm
random.py	28802	0644	edit dl rm
re.py	15861	0644	edit dl rm
reprlib.py	5267	0644	edit dl rm
rlcompleter.py	7097	0644	edit dl rm
runpy.py	12052	0644	edit dl rm
sched.py	6442	0644	edit dl rm
secrets.py	2038	0644	edit dl rm
selectors.py	18561	0644	edit dl rm
shelve.py	8527	0644	edit dl rm
shlex.py	13325	0644	edit dl rm
shutil.py	51474	0644	edit dl rm
signal.py	2273	0644	edit dl rm
site.py	22336	0644	edit dl rm
sitecustomize.py	-	0	edit dl rm
smtpd.py	34709	0755	edit dl rm
smtplib.py	44804	0755	edit dl rm
sndhdr.py	7099	0644	edit dl rm
socket.py	35243	0644	edit dl rm
socketserver.py	27296	0644	edit dl rm
sre_compile.py	26695	0644	edit dl rm
sre_constants.py	7154	0644	edit dl rm
sre_parse.py	40230	0644	edit dl rm
ssl.py	52363	0644	edit dl rm
stat.py	5485	0644	edit dl rm
statistics.py	39690	0644	edit dl rm
string.py	10535	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	77330	0644	edit dl rm
sunau.py	18375	0644	edit dl rm
symbol.py	2109	0644	edit dl rm
symtable.py	8021	0644	edit dl rm
sysconfig.py	25035	0644	edit dl rm
tabnanny.py	11406	0755	edit dl rm
tarfile.py	95580	0755	edit dl rm
telnetlib.py	23254	0644	edit dl rm
tempfile.py	32920	0644	edit dl rm
textwrap.py	19407	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	50820	0644	edit dl rm
timeit.py	13480	0755	edit dl rm
token.py	2368	0644	edit dl rm
tokenize.py	25841	0644	edit dl rm
trace.py	29858	0755	edit dl rm
traceback.py	23611	0644	edit dl rm
tracemalloc.py	17076	0644	edit dl rm
tty.py	879	0644	edit dl rm
turtle.py	143716	0644	edit dl rm
types.py	9713	0644	edit dl rm
typing.py	68962	0644	edit dl rm
uu.py	6957	0755	edit dl rm
uuid.py	30466	0644	edit dl rm
warnings.py	19688	0644	edit dl rm
wave.py	18230	0644	edit dl rm
weakref.py	21387	0644	edit dl rm
webbrowser.py	24083	0755	edit dl rm
xdrlib.py	5913	0644	edit dl rm
zipapp.py	7535	0644	edit dl rm
zipfile.py	89135	0644	edit dl rm
zipimport.py	30765	0644	edit dl rm
_bootlocale.py	1801	0644	edit dl rm
_collections_abc.py	26100	0644	edit dl rm
_compat_pickle.py	8749	0644	edit dl rm
_compression.py	5340	0644	edit dl rm
_dummy_thread.py	6027	0644	edit dl rm
_markupbase.py	14598	0644	edit dl rm
_osx_support.py	21774	0644	edit dl rm
_pydecimal.py	228666	0644	edit dl rm
_pyio.py	93177	0644	edit dl rm
_py_abc.py	6189	0644	edit dl rm
_sitebuiltins.py	3115	0644	edit dl rm
_strptime.py	25268	0644	edit dl rm
_sysconfigdata__linux_x86_64-linux-gnu.py	25834	0644	edit dl rm
_sysconfigdata__x86_64-linux-gnu.py	25834	0644	edit dl rm
_threading_local.py	7220	0644	edit dl rm
_weakrefset.py	5735	0644	edit dl rm
__future__.py	5147	0644	edit dl rm
__phello__.foo.py	64	0644	edit dl rm

Edit: /snap/core20/2769/usr/lib/python3.8/dis.py (20570B)

"""Disassembler of Python byte code into mnemonics."""

import sys
import types
import collections
import io

from opcode import *
from opcode import __all__ as _opcodes_all

__all__ = ["code_info", "dis", "disassemble", "distb", "disco",
           "findlinestarts", "findlabels", "show_code",
           "get_instructions", "Instruction", "Bytecode"] + _opcodes_all
del _opcodes_all

_have_code = (types.MethodType, types.FunctionType, types.CodeType,
              classmethod, staticmethod, type)

FORMAT_VALUE = opmap['FORMAT_VALUE']
FORMAT_VALUE_CONVERTERS = (
    (None, ''),
    (str, 'str'),
    (repr, 'repr'),
    (ascii, 'ascii'),
)
MAKE_FUNCTION = opmap['MAKE_FUNCTION']
MAKE_FUNCTION_FLAGS = ('defaults', 'kwdefaults', 'annotations', 'closure')

def _try_compile(source, name):
    """Attempts to compile the given source, first as an expression and
       then as a statement if the first approach fails.

Utility function to accept strings in functions that otherwise
       expect code objects
    """
    try:
        c = compile(source, name, 'eval')
    except SyntaxError:
        c = compile(source, name, 'exec')
    return c

def dis(x=None, *, file=None, depth=None):
    """Disassemble classes, methods, functions, and other compiled objects.

With no argument, disassemble the last traceback.

Compiled objects currently include generator objects, async generator
    objects, and coroutine objects, all of which store their code object
    in a special attribute.
    """
    if x is None:
        distb(file=file)
        return
    # Extract functions from methods.
    if hasattr(x, '__func__'):
        x = x.__func__
    # Extract compiled code objects from...
    if hasattr(x, '__code__'):  # ...a function, or
        x = x.__code__
    elif hasattr(x, 'gi_code'):  #...a generator object, or
        x = x.gi_code
    elif hasattr(x, 'ag_code'):  #...an asynchronous generator object, or
        x = x.ag_code
    elif hasattr(x, 'cr_code'):  #...a coroutine.
        x = x.cr_code
    # Perform the disassembly.
    if hasattr(x, '__dict__'):  # Class or module
        items = sorted(x.__dict__.items())
        for name, x1 in items:
            if isinstance(x1, _have_code):
                print("Disassembly of %s:" % name, file=file)
                try:
                    dis(x1, file=file, depth=depth)
                except TypeError as msg:
                    print("Sorry:", msg, file=file)
                print(file=file)
    elif hasattr(x, 'co_code'): # Code object
        _disassemble_recursive(x, file=file, depth=depth)
    elif isinstance(x, (bytes, bytearray)): # Raw bytecode
        _disassemble_bytes(x, file=file)
    elif isinstance(x, str):    # Source code
        _disassemble_str(x, file=file, depth=depth)
    else:
        raise TypeError("don't know how to disassemble %s objects" %
                        type(x).__name__)

def distb(tb=None, *, file=None):
    """Disassemble a traceback (default: last traceback)."""
    if tb is None:
        try:
            tb = sys.last_traceback
        except AttributeError:
            raise RuntimeError("no last traceback to disassemble") from None
        while tb.tb_next: tb = tb.tb_next
    disassemble(tb.tb_frame.f_code, tb.tb_lasti, file=file)

# The inspect module interrogates this dictionary to build its
# list of CO_* constants. It is also used by pretty_flags to
# turn the co_flags field into a human readable list.
COMPILER_FLAG_NAMES = {
     1: "OPTIMIZED",
     2: "NEWLOCALS",
     4: "VARARGS",
     8: "VARKEYWORDS",
    16: "NESTED",
    32: "GENERATOR",
    64: "NOFREE",
   128: "COROUTINE",
   256: "ITERABLE_COROUTINE",
   512: "ASYNC_GENERATOR",
}

def pretty_flags(flags):
    """Return pretty representation of code flags."""
    names = []
    for i in range(32):
        flag = 1<<i
        if flags & flag:
            names.append(COMPILER_FLAG_NAMES.get(flag, hex(flag)))
            flags ^= flag
            if not flags:
                break
    else:
        names.append(hex(flags))
    return ", ".join(names)

def _get_code_object(x):
    """Helper to handle methods, compiled or raw code objects, and strings."""
    # Extract functions from methods.
    if hasattr(x, '__func__'):
        x = x.__func__
    # Extract compiled code objects from...
    if hasattr(x, '__code__'):  # ...a function, or
        x = x.__code__
    elif hasattr(x, 'gi_code'):  #...a generator object, or
        x = x.gi_code
    elif hasattr(x, 'ag_code'):  #...an asynchronous generator object, or
        x = x.ag_code
    elif hasattr(x, 'cr_code'):  #...a coroutine.
        x = x.cr_code
    # Handle source code.
    if isinstance(x, str):
        x = _try_compile(x, "<disassembly>")
    # By now, if we don't have a code object, we can't disassemble x.
    if hasattr(x, 'co_code'):
        return x
    raise TypeError("don't know how to disassemble %s objects" %
                    type(x).__name__)

def code_info(x):
    """Formatted details of methods, functions, or code."""
    return _format_code_info(_get_code_object(x))

def _format_code_info(co):
    lines = []
    lines.append("Name:              %s" % co.co_name)
    lines.append("Filename:          %s" % co.co_filename)
    lines.append("Argument count:    %s" % co.co_argcount)
    lines.append("Positional-only arguments: %s" % co.co_posonlyargcount)
    lines.append("Kw-only arguments: %s" % co.co_kwonlyargcount)
    lines.append("Number of locals:  %s" % co.co_nlocals)
    lines.append("Stack size:        %s" % co.co_stacksize)
    lines.append("Flags:             %s" % pretty_flags(co.co_flags))
    if co.co_consts:
        lines.append("Constants:")
        for i_c in enumerate(co.co_consts):
            lines.append("%4d: %r" % i_c)
    if co.co_names:
        lines.append("Names:")
        for i_n in enumerate(co.co_names):
            lines.append("%4d: %s" % i_n)
    if co.co_varnames:
        lines.append("Variable names:")
        for i_n in enumerate(co.co_varnames):
            lines.append("%4d: %s" % i_n)
    if co.co_freevars:
        lines.append("Free variables:")
        for i_n in enumerate(co.co_freevars):
            lines.append("%4d: %s" % i_n)
    if co.co_cellvars:
        lines.append("Cell variables:")
        for i_n in enumerate(co.co_cellvars):
            lines.append("%4d: %s" % i_n)
    return "\n".join(lines)

def show_code(co, *, file=None):
    """Print details of methods, functions, or code to *file*.

If *file* is not provided, the output is printed on stdout.
    """
    print(code_info(co), file=file)

_Instruction = collections.namedtuple("_Instruction",
     "opname opcode arg argval argrepr offset starts_line is_jump_target")

_Instruction.opname.__doc__ = "Human readable name for operation"
_Instruction.opcode.__doc__ = "Numeric code for operation"
_Instruction.arg.__doc__ = "Numeric argument to operation (if any), otherwise None"
_Instruction.argval.__doc__ = "Resolved arg value (if known), otherwise same as arg"
_Instruction.argrepr.__doc__ = "Human readable description of operation argument"
_Instruction.offset.__doc__ = "Start index of operation within bytecode sequence"
_Instruction.starts_line.__doc__ = "Line started by this opcode (if any), otherwise None"
_Instruction.is_jump_target.__doc__ = "True if other code jumps to here, otherwise False"

_OPNAME_WIDTH = 20
_OPARG_WIDTH = 5

class Instruction(_Instruction):
    """Details for a bytecode operation

Defined fields:
         opname - human readable name for operation
         opcode - numeric code for operation
         arg - numeric argument to operation (if any), otherwise None
         argval - resolved arg value (if known), otherwise same as arg
         argrepr - human readable description of operation argument
         offset - start index of operation within bytecode sequence
         starts_line - line started by this opcode (if any), otherwise None
         is_jump_target - True if other code jumps to here, otherwise False
    """

def _disassemble(self, lineno_width=3, mark_as_current=False, offset_width=4):
        """Format instruction details for inclusion in disassembly output

*lineno_width* sets the width of the line number field (0 omits it)
        *mark_as_current* inserts a '-->' marker arrow as part of the line
        *offset_width* sets the width of the instruction offset field
        """
        fields = []
        # Column: Source code line number
        if lineno_width:
            if self.starts_line is not None:
                lineno_fmt = "%%%dd" % lineno_width
                fields.append(lineno_fmt % self.starts_line)
            else:
                fields.append(' ' * lineno_width)
        # Column: Current instruction indicator
        if mark_as_current:
            fields.append('-->')
        else:
            fields.append('   ')
        # Column: Jump target marker
        if self.is_jump_target:
            fields.append('>>')
        else:
            fields.append('  ')
        # Column: Instruction offset from start of code sequence
        fields.append(repr(self.offset).rjust(offset_width))
        # Column: Opcode name
        fields.append(self.opname.ljust(_OPNAME_WIDTH))
        # Column: Opcode argument
        if self.arg is not None:
            fields.append(repr(self.arg).rjust(_OPARG_WIDTH))
            # Column: Opcode argument details
            if self.argrepr:
                fields.append('(' + self.argrepr + ')')
        return ' '.join(fields).rstrip()

def get_instructions(x, *, first_line=None):
    """Iterator for the opcodes in methods, functions or code

Generates a series of Instruction named tuples giving the details of
    each operations in the supplied code.

If *first_line* is not None, it indicates the line number that should
    be reported for the first source line in the disassembled code.
    Otherwise, the source line information (if any) is taken directly from
    the disassembled code object.
    """
    co = _get_code_object(x)
    cell_names = co.co_cellvars + co.co_freevars
    linestarts = dict(findlinestarts(co))
    if first_line is not None:
        line_offset = first_line - co.co_firstlineno
    else:
        line_offset = 0
    return _get_instructions_bytes(co.co_code, co.co_varnames, co.co_names,
                                   co.co_consts, cell_names, linestarts,
                                   line_offset)

def _get_const_info(const_index, const_list):
    """Helper to get optional details about const references

Returns the dereferenced constant and its repr if the constant
       list is defined.
       Otherwise returns the constant index and its repr().
    """
    argval = const_index
    if const_list is not None:
        argval = const_list[const_index]
    return argval, repr(argval)

def _get_name_info(name_index, name_list):
    """Helper to get optional details about named references

Returns the dereferenced name as both value and repr if the name
       list is defined.
       Otherwise returns the name index and its repr().
    """
    argval = name_index
    if name_list is not None:
        argval = name_list[name_index]
        argrepr = argval
    else:
        argrepr = repr(argval)
    return argval, argrepr

def _get_instructions_bytes(code, varnames=None, names=None, constants=None,
                      cells=None, linestarts=None, line_offset=0):
    """Iterate over the instructions in a bytecode string.

Generates a sequence of Instruction namedtuples giving the details of each
    opcode.  Additional information about the code's runtime environment
    (e.g. variable names, constants) can be specified using optional
    arguments.

"""
    labels = findlabels(code)
    starts_line = None
    for offset, op, arg in _unpack_opargs(code):
        if linestarts is not None:
            starts_line = linestarts.get(offset, None)
            if starts_line is not None:
                starts_line += line_offset
        is_jump_target = offset in labels
        argval = None
        argrepr = ''
        if arg is not None:
            #  Set argval to the dereferenced value of the argument when
            #  available, and argrepr to the string representation of argval.
            #    _disassemble_bytes needs the string repr of the
            #    raw name index for LOAD_GLOBAL, LOAD_CONST, etc.
            argval = arg
            if op in hasconst:
                argval, argrepr = _get_const_info(arg, constants)
            elif op in hasname:
                argval, argrepr = _get_name_info(arg, names)
            elif op in hasjrel:
                argval = offset + 2 + arg
                argrepr = "to " + repr(argval)
            elif op in haslocal:
                argval, argrepr = _get_name_info(arg, varnames)
            elif op in hascompare:
                argval = cmp_op[arg]
                argrepr = argval
            elif op in hasfree:
                argval, argrepr = _get_name_info(arg, cells)
            elif op == FORMAT_VALUE:
                argval, argrepr = FORMAT_VALUE_CONVERTERS[arg & 0x3]
                argval = (argval, bool(arg & 0x4))
                if argval[1]:
                    if argrepr:
                        argrepr += ', '
                    argrepr += 'with format'
            elif op == MAKE_FUNCTION:
                argrepr = ', '.join(s for i, s in enumerate(MAKE_FUNCTION_FLAGS)
                                    if arg & (1<<i))
        yield Instruction(opname[op], op,
                          arg, argval, argrepr,
                          offset, starts_line, is_jump_target)

def disassemble(co, lasti=-1, *, file=None):
    """Disassemble a code object."""
    cell_names = co.co_cellvars + co.co_freevars
    linestarts = dict(findlinestarts(co))
    _disassemble_bytes(co.co_code, lasti, co.co_varnames, co.co_names,
                       co.co_consts, cell_names, linestarts, file=file)

def _disassemble_recursive(co, *, file=None, depth=None):
    disassemble(co, file=file)
    if depth is None or depth > 0:
        if depth is not None:
            depth = depth - 1
        for x in co.co_consts:
            if hasattr(x, 'co_code'):
                print(file=file)
                print("Disassembly of %r:" % (x,), file=file)
                _disassemble_recursive(x, file=file, depth=depth)

def _disassemble_bytes(code, lasti=-1, varnames=None, names=None,
                       constants=None, cells=None, linestarts=None,
                       *, file=None, line_offset=0):
    # Omit the line number column entirely if we have no line number info
    show_lineno = linestarts is not None
    if show_lineno:
        maxlineno = max(linestarts.values()) + line_offset
        if maxlineno >= 1000:
            lineno_width = len(str(maxlineno))
        else:
            lineno_width = 3
    else:
        lineno_width = 0
    maxoffset = len(code) - 2
    if maxoffset >= 10000:
        offset_width = len(str(maxoffset))
    else:
        offset_width = 4
    for instr in _get_instructions_bytes(code, varnames, names,
                                         constants, cells, linestarts,
                                         line_offset=line_offset):
        new_source_line = (show_lineno and
                           instr.starts_line is not None and
                           instr.offset > 0)
        if new_source_line:
            print(file=file)
        is_current_instr = instr.offset == lasti
        print(instr._disassemble(lineno_width, is_current_instr, offset_width),
              file=file)

def _disassemble_str(source, **kwargs):
    """Compile the source string, then disassemble the code object."""
    _disassemble_recursive(_try_compile(source, '<dis>'), **kwargs)

disco = disassemble                     # XXX For backwards compatibility

def _unpack_opargs(code):
    extended_arg = 0
    for i in range(0, len(code), 2):
        op = code[i]
        if op >= HAVE_ARGUMENT:
            arg = code[i+1] | extended_arg
            extended_arg = (arg << 8) if op == EXTENDED_ARG else 0
        else:
            arg = None
        yield (i, op, arg)

def findlabels(code):
    """Detect all offsets in a byte code which are jump targets.

Return the list of offsets.

"""
    labels = []
    for offset, op, arg in _unpack_opargs(code):
        if arg is not None:
            if op in hasjrel:
                label = offset + 2 + arg
            elif op in hasjabs:
                label = arg
            else:
                continue
            if label not in labels:
                labels.append(label)
    return labels

def findlinestarts(code):
    """Find the offsets in a byte code which are start of lines in the source.

Generate pairs (offset, lineno) as described in Python/compile.c.

"""
    byte_increments = code.co_lnotab[0::2]
    line_increments = code.co_lnotab[1::2]
    bytecode_len = len(code.co_code)

lastlineno = None
    lineno = code.co_firstlineno
    addr = 0
    for byte_incr, line_incr in zip(byte_increments, line_increments):
        if byte_incr:
            if lineno != lastlineno:
                yield (addr, lineno)
                lastlineno = lineno
            addr += byte_incr
            if addr >= bytecode_len:
                # The rest of the lnotab byte offsets are past the end of
                # the bytecode, so the lines were optimized away.
                return
        if line_incr >= 0x80:
            # line_increments is an array of 8-bit signed integers
            line_incr -= 0x100
        lineno += line_incr
    if lineno != lastlineno:
        yield (addr, lineno)

class Bytecode:
    """The bytecode operations of a piece of code

Instantiate this with a function, method, other compiled object, string of
    code, or a code object (as returned by compile()).

Iterating over this yields the bytecode operations as Instruction instances.
    """
    def __init__(self, x, *, first_line=None, current_offset=None):
        self.codeobj = co = _get_code_object(x)
        if first_line is None:
            self.first_line = co.co_firstlineno
            self._line_offset = 0
        else:
            self.first_line = first_line
            self._line_offset = first_line - co.co_firstlineno
        self._cell_names = co.co_cellvars + co.co_freevars
        self._linestarts = dict(findlinestarts(co))
        self._original_object = x
        self.current_offset = current_offset

def __iter__(self):
        co = self.codeobj
        return _get_instructions_bytes(co.co_code, co.co_varnames, co.co_names,
                                       co.co_consts, self._cell_names,
                                       self._linestarts,
                                       line_offset=self._line_offset)

def __repr__(self):
        return "{}({!r})".format(self.__class__.__name__,
                                 self._original_object)

@classmethod
    def from_traceback(cls, tb):
        """ Construct a Bytecode from the given traceback """
        while tb.tb_next:
            tb = tb.tb_next
        return cls(tb.tb_frame.f_code, current_offset=tb.tb_lasti)

def info(self):
        """Return formatted information about the code object."""
        return _format_code_info(self.codeobj)

def dis(self):
        """Return a formatted view of the bytecode operations."""
        co = self.codeobj
        if self.current_offset is not None:
            offset = self.current_offset
        else:
            offset = -1
        with io.StringIO() as output:
            _disassemble_bytes(co.co_code, varnames=co.co_varnames,
                               names=co.co_names, constants=co.co_consts,
                               cells=self._cell_names,
                               linestarts=self._linestarts,
                               line_offset=self._line_offset,
                               file=output,
                               lasti=offset)
            return output.getvalue()

def _test():
    """Simple test program to disassemble a file."""
    import argparse

parser = argparse.ArgumentParser()
    parser.add_argument('infile', type=argparse.FileType('rb'), nargs='?', default='-')
    args = parser.parse_args()
    with args.infile as infile:
        source = infile.read()
    code = compile(source, args.infile.name, "exec")
    dis(code)

if __name__ == "__main__":
    _test()

cmd: