Additional Utilities

class JSONLIterator:
    """Iterator for reading JSON Lines format files."""
    def __init__(self, file_obj): ...
    def __iter__(self): ...
    def __next__(self): ...

def reverse_iter_lines(file_obj, blocksize=DEFAULT_BLOCKSIZE, **kwargs):
    """
    Iterate file lines in reverse order.
    
    Parameters:
    - file_obj: File object to read
    - blocksize (int): Block size for reading
    
    Yields:
    str: Each line in reverse order
    """

def namedtuple(typename, field_names, verbose=False, rename=False):
    """
    Enhanced namedtuple factory.
    
    Parameters:
    - typename (str): Name of the new tuple subclass
    - field_names (str or list): Field names for the tuple
    - verbose (bool): Print class definition if True
    - rename (bool): Replace invalid field names with valid ones
    
    Returns:
    type: New namedtuple class
    """

def namedlist(typename, field_names, verbose=False, rename=False):
    """
    Mutable namedtuple equivalent.
    
    Parameters:
    - typename (str): Name of the new list subclass
    - field_names (str or list): Field names for the list
    - verbose (bool): Print class definition if True
    - rename (bool): Replace invalid field names with valid ones
    
    Returns:
    type: New namedlist class with mutable fields
    """

def make_sentinel(name='_MISSING', var_name=None):
    """
    Create unique sentinel objects.
    
    Parameters:
    - name (str): Name for the sentinel
    - var_name (str, optional): Variable name for representation
    
    Returns:
    Sentinel: Unique sentinel object
    """

def issubclass(subclass, baseclass):
    """
    Enhanced issubclass with better error handling.
    
    Parameters:
    - subclass: Potential subclass to check
    - baseclass: Base class or tuple of base classes
    
    Returns:
    bool: True if subclass is a subclass of baseclass
    """

def get_all_subclasses(cls):
    """
    Get all subclasses recursively.
    
    Parameters:
    - cls (type): Base class
    
    Returns:
    set: Set of all subclasses
    """

class Sentinel:
    """Unique sentinel object for special values."""
    def __init__(self, name, var_name=None): ...
    def __repr__(self): ...
    def __bool__(self): ...
    __nonzero__ = __bool__  # Python 2 compatibility

class classproperty:
    """Property descriptor for class-level properties."""
    def __init__(self, func): ...
    def __get__(self, obj, objtype=None): ...

def get_profile(**kwargs):
    """
    Main entrypoint returning JSON-serializable system info dict.
    
    Parameters:
    - **kwargs: Additional profile options
    
    Returns:
    dict: Comprehensive system profile information
    """

def get_python_info():
    """
    Collect Python interpreter information.
    
    Returns:
    dict: Python interpreter details
    """

def get_profile_json(indent=False):
    """
    Get profile as JSON string.
    
    Parameters:
    - indent (bool): Pretty-print JSON with indentation
    
    Returns:
    str: JSON-formatted profile data
    """

def dumps(val, indent):
    """
    JSON serialization with optional indentation.
    
    Parameters:
    - val: Value to serialize
    - indent (bool or int): Indentation for pretty-printing
    
    Returns:
    str: JSON-serialized string
    """

class mbox_readonlydir:
    """Read-only directory-like access to mbox files."""
    def __init__(self, path, maxmem=DEFAULT_MAXMEM): ...
    def __getitem__(self, key): ...
    def __iter__(self): ...
    def keys(self): ...
    def values(self): ...
    def items(self): ...
    def get(self, key, default=None): ...

class DeprecatableModule(ModuleType):
    """Module wrapper that warns on deprecated member access."""
    def __init__(self, name, deprecated_members=None): ...
    def __getattr__(self, name): ...

def deprecate_module_member(mod_name, name, message):
    """
    Mark a module member as deprecated.
    
    Parameters:
    - mod_name (str): Module name
    - name (str): Member name to deprecate
    - message (str): Deprecation warning message
    
    Returns:
    None
    """

class ExceptionCauseMixin(Exception):
    """Mixin for exceptions that can have causes."""
    def __init__(self, *args, **kwargs): ...
    @property
    def cause(self): ...

class MathError(ExceptionCauseMixin, ValueError):
    """Example math-related exception."""
    pass

def whoops_math():
    """Example function demonstrating exception handling."""
    try:
        return math_lol()
    except Exception as e:
        raise MathError("Math operation failed") from e

def math_lol(n=0):
    """Example recursive math function."""
    if n > 10:
        raise ValueError("Number too large")
    return n * math_lol(n + 1) if n < 5 else 1

def gobs_program():
    """
    Pure-Python implementation of Gob's Algorithm.
    
    Returns:
    str: Result of Gob's Algorithm (novelty function)
    """

from boltons.jsonutils import JSONLIterator
from boltons.namedutils import namedtuple, namedlist
from boltons.typeutils import make_sentinel, issubclass
from boltons.ecoutils import get_profile

# JSON Lines processing
with open('data.jsonl', 'r') as f:
    jsonl_iter = JSONLIterator(f)
    for record in jsonl_iter:
        print(f"Processing: {record}")

# Enhanced namedtuple
Person = namedtuple('Person', 'name age city', verbose=True)
alice = Person('Alice', 30, 'New York')
print(f"Name: {alice.name}, Age: {alice.age}")

# Mutable namedlist
MutablePerson = namedlist('MutablePerson', 'name age city')
bob = MutablePerson('Bob', 25, 'Los Angeles')
bob.age = 26  # Can modify fields
print(f"Updated age: {bob.age}")

# Sentinel objects for special values
MISSING = make_sentinel('MISSING')
DEFAULT = make_sentinel('DEFAULT', 'DEFAULT_VALUE')

def process_data(data, strategy=MISSING):
    if strategy is MISSING:
        print("No strategy specified")
    elif strategy is DEFAULT:
        print("Using default strategy")
    else:
        print(f"Using strategy: {strategy}")

process_data([1, 2, 3])  # No strategy specified
process_data([1, 2, 3], DEFAULT)  # Using default strategy

# Enhanced type checking
class Animal: pass
class Dog(Animal): pass
class Puppy(Dog): pass

print(issubclass(Dog, Animal))    # True
print(issubclass("not a class", Animal))  # False (no TypeError)

from boltons.typeutils import get_all_subclasses
all_subs = get_all_subclasses(Animal)
print(f"Animal subclasses: {all_subs}")  # {Dog, Puppy}

# System profiling
profile = get_profile()
print(f"Python version: {profile['python']['version']}")
print(f"Platform: {profile['system']['platform']}")
print(f"Architecture: {profile['system']['architecture']}")

from boltons.ecoutils import get_python_info, get_profile_json
from boltons.deprutils import DeprecatableModule, deprecate_module_member
from boltons.mboxutils import mbox_readonlydir
import tempfile
import warnings

# Detailed Python environment analysis
python_info = get_python_info()
print("Python Environment Details:")
for key, value in python_info.items():
    print(f"  {key}: {value}")

# Export environment profile as JSON
profile_json = get_profile_json(indent=True)
with open('system_profile.json', 'w') as f:
    f.write(profile_json)

# Deprecation management
# Create a module with deprecated members
class MyModule(DeprecatableModule):
    def __init__(self):
        super().__init__('mymodule')
        self.new_function = lambda: "This is the new function"
        self._deprecated_members = {
            'old_function': 'old_function is deprecated, use new_function instead'
        }

my_module = MyModule()

# Access deprecated member (will issue warning)
with warnings.catch_warnings(record=True) as w:
    warnings.simplefilter("always")
    try:
        result = my_module.old_function  # Triggers deprecation warning
    except AttributeError:
        print("Deprecated member access blocked")
    
    if w:
        print(f"Warning: {w[0].message}")

# Mailbox processing (if mbox file exists)
# mbox_dir = mbox_readonlydir('/path/to/mailbox.mbox')
# for message_id in mbox_dir.keys():
#     message = mbox_dir[message_id]
#     print(f"Message {message_id}: {message['Subject']}")

# Class-level properties
class ConfigManager:
    _instance = None
    _config = {'debug': False, 'version': '1.0'}
    
    @classproperty
    def config(cls):
        return cls._config
    
    @classproperty  
    def debug_mode(cls):
        return cls._config.get('debug', False)

print(f"Debug mode: {ConfigManager.debug_mode}")
print(f"Config: {ConfigManager.config}")

# Exception handling with causes
from boltons.excutils import ExceptionCauseMixin

class DataProcessingError(ExceptionCauseMixin):
    pass

def process_file(filename):
    try:
        with open(filename, 'r') as f:
            data = f.read()
            return json.loads(data)  # Might raise JSONDecodeError
    except FileNotFoundError as e:
        raise DataProcessingError(f"Could not find file: {filename}") from e
    except json.JSONDecodeError as e:
        raise DataProcessingError(f"Invalid JSON in file: {filename}") from e

# The resulting exception will have both the original cause and new context

# Constants
ECO_VERSION = '1.1.0'                    # Protocol version for environment profiles
DEFAULT_BLOCKSIZE = 4096                 # Default block size for file operations
DEFAULT_MAXMEM = 4 * 1024 * 1024        # Default memory limit (4MB)

# Environment profile components
INSTANCE_ID: str                         # Unique 128-bit identifier for current process
START_TIME_INFO: dict                    # Dictionary with startup time information

# Sentinel type
SentinelType = type(make_sentinel())     # Type of sentinel objects