Development & Debugging Tools

def pdb_on_signal(signalnum=None):
    """
    Install signal handler to launch pdb breakpoint.
    
    Parameters:
    - signalnum (int, optional): Signal number (default: SIGUSR1)
    
    Returns:
    None
    """

def pdb_on_exception(limit=100):
    """
    Install handler for post-mortem pdb on unhandled exceptions.
    
    Parameters:
    - limit (int): Traceback limit
    
    Returns:
    None
    """

def wrap_trace(obj, hook=trace_print_hook, **kwargs):
    """
    Monitor object interactions with custom tracing.
    
    Parameters:
    - obj: Object to trace
    - hook (callable): Trace event handler
    
    Returns:
    Wrapped object with tracing
    """

def trace_print_hook(event, label, obj, attr_name, **kwargs):
    """
    Default hook for printing trace events.
    
    Parameters:
    - event (str): Event type ('get', 'set', 'call', etc.)
    - label (str): Trace label
    - obj: Target object
    - attr_name (str): Attribute name
    
    Returns:
    None
    """

class Callpoint:
    """Represents a single point in a call stack."""
    def __init__(self, tb_frame, lineno): ...
    @property
    def filename(self): ...
    @property
    def lineno(self): ...
    @property
    def func_name(self): ...
    @property
    def module_name(self): ...
    def __repr__(self): ...

class TracebackInfo:
    """Enhanced traceback information with additional context."""
    def __init__(self, tb): ...
    @property
    def callpoints(self): ...
    def format(self): ...
    def to_dict(self): ...

class ExceptionInfo:
    """Enhanced exception information with formatting."""
    def __init__(self, exc_type, exc_value, exc_tb): ...
    @property
    def exc_type(self): ...
    @property
    def exc_msg(self): ...
    @property
    def tb_info(self): ...
    def format(self): ...

class ContextualCallpoint(Callpoint):
    """Callpoint with source code context."""
    @property
    def source_lines(self): ...
    @property
    def source_context(self): ...

class ContextualTracebackInfo(TracebackInfo):
    """TracebackInfo with source context."""
    pass

class ContextualExceptionInfo(ExceptionInfo):
    """ExceptionInfo with source context."""
    pass

class ParsedException:
    """Parsed exception from string representation."""
    def __init__(self, exc_str): ...
    @property
    def exc_type_name(self): ...
    @property
    def exc_msg(self): ...

def format_exception_only(etype, value):
    """
    Format exception without traceback.
    
    Parameters:
    - etype (type): Exception type
    - value (Exception): Exception instance
    
    Returns:
    str: Formatted exception string
    """

def print_exception(etype, value, tb, **kwargs):
    """
    Enhanced exception printing.
    
    Parameters:
    - etype (type): Exception type
    - value (Exception): Exception instance
    - tb: Traceback object
    
    Returns:
    None
    """

def fix_print_exception():
    """
    Monkey-patch sys.excepthook with enhanced version.
    
    Returns:
    None
    """

def get_module_callables(mod, ignore=None):
    """
    Get all callable objects from a module.
    
    Parameters:
    - mod: Module to inspect
    - ignore (set, optional): Names to ignore
    
    Returns:
    dict: Mapping of names to callable objects
    """

def mro_items(type_obj):
    """
    Get method resolution order as (name, class) pairs.
    
    Parameters:
    - type_obj (type): Type to analyze
    
    Returns:
    list: List of (method_name, defining_class) tuples
    """

def dir_dict(obj, raise_exc=False):
    """
    Get object's __dict__ with error handling.
    
    Parameters:
    - obj: Object to inspect
    - raise_exc (bool): Raise exceptions on access errors
    
    Returns:
    dict: Object's attributes dictionary
    """

def copy_function(orig, copy_dict=True):
    """
    Create copy of function object.
    
    Parameters:
    - orig (function): Original function
    - copy_dict (bool): Copy function's __dict__
    
    Returns:
    function: Copied function
    """

def partial_ordering(cls):
    """
    Class decorator to add comparison methods from __lt__.
    
    Parameters:
    - cls (type): Class to enhance
    
    Returns:
    type: Enhanced class with comparison methods
    """

class FunctionBuilder:
    """Programmatically build function signatures and implementations."""
    def __init__(self, name, doc=None, defaults=None, **kwargs): ...
    def add_arg(self, name, default=NO_DEFAULT): ...
    def add_kwarg(self, name, default): ...
    def compile(self, execdict=None): ...

def format_invocation(name='', args=(), kwargs=None, **kw):
    """
    Format function call as string.
    
    Parameters:
    - name (str): Function name
    - args (tuple): Positional arguments
    - kwargs (dict): Keyword arguments
    
    Returns:
    str: Formatted function call
    """

def wraps(func, injected=None, expected=None, **kw):
    """
    Enhanced functools.wraps.
    
    Parameters:
    - func (callable): Function to wrap
    - injected (list): Injected argument names
    - expected (list): Expected argument names
    
    Returns:
    callable: Decorator function
    """

def noop(*args, **kwargs):
    """
    No-operation function.
    
    Parameters:
    - *args: Any positional arguments (ignored)
    - **kwargs: Any keyword arguments (ignored)
    
    Returns:
    None
    """

class GCToggler:
    """Context manager to temporarily disable/enable garbage collection."""
    def __init__(self, enabled=False): ...
    def __enter__(self): ...
    def __exit__(self, exc_type, exc_val, exc_tb): ...

def get_all(type_obj, include_subtypes=True):
    """
    Get all instances of a type from GC.
    
    Parameters:
    - type_obj (type): Type to search for
    - include_subtypes (bool): Include subtype instances
    
    Returns:
    list: List of instances found in GC
    """

from boltons.debugutils import pdb_on_signal, pdb_on_exception, wrap_trace
from boltons.tbutils import TracebackInfo, ExceptionInfo
from boltons.funcutils import FunctionBuilder, get_module_callables
from boltons.gcutils import GCToggler, get_all
import signal

# Enhanced debugging setup
pdb_on_signal(signal.SIGUSR1)  # Send SIGUSR1 to drop into debugger
pdb_on_exception()             # Auto-debug on unhandled exceptions

# Trace object interactions
class TracedClass:
    def method(self):
        return "traced"

traced_obj = wrap_trace(TracedClass())
traced_obj.method()  # Prints trace information

# Enhanced exception handling
try:
    raise ValueError("Something went wrong")
except:
    import sys
    exc_info = ExceptionInfo(*sys.exc_info())
    print(exc_info.format())  # Enhanced exception formatting

# Function analysis
import math
callables = get_module_callables(math)
print(f"Math module has {len(callables)} callable functions")

# Dynamic function building
builder = FunctionBuilder('dynamic_func', doc='Dynamically created function')
builder.add_arg('x')
builder.add_arg('y', default=10)
builder.add_kwarg('multiply', default=True)

func_code = '''
if multiply:
    return x * y
else:
    return x + y
'''

dynamic_func = builder.compile({'multiply': True})
# Now dynamic_func(5, y=3, multiply=False) works

# Garbage collection analysis
class TestClass:
    pass

instances = [TestClass() for _ in range(10)]
found_instances = get_all(TestClass)
print(f"Found {len(found_instances)} TestClass instances in GC")

# Temporarily disable GC for performance-critical section
with GCToggler(enabled=False):
    # Perform operations without GC interruption
    heavy_computation()

from boltons.funcutils import copy_function, format_invocation, wraps
from boltons.tbutils import ContextualExceptionInfo

# Function copying and modification
def original_func(x, y=5):
    \"\"\"Original function docstring.\"\"\"
    return x + y

copied_func = copy_function(original_func)
copied_func.__name__ = 'modified_func'
copied_func.__doc__ = 'Modified function docstring.'

# Enhanced wrapper with injection
@wraps(original_func, injected=['logger'])
def logged_wrapper(logger, *args, **kwargs):
    call_str = format_invocation('original_func', args, kwargs)
    logger.info(f"Calling: {call_str}")
    return original_func(*args, **kwargs)

# Contextual exception analysis
try:
    def problematic_function():
        x = 1 / 0  # Division by zero
        return x
    
    problematic_function()
except:
    import sys
    ctx_exc_info = ContextualExceptionInfo(*sys.exc_info())
    
    # Get detailed context with source code
    formatted = ctx_exc_info.format()
    print("Detailed exception with source context:")
    print(formatted)
    
    # Access individual callpoints with context
    for callpoint in ctx_exc_info.tb_info.callpoints:
        if hasattr(callpoint, 'source_context'):
            print(f"Function: {callpoint.func_name}")
            print(f"Source context around line {callpoint.lineno}:")
            for line_no, line in callpoint.source_context:
                marker = ">>>" if line_no == callpoint.lineno else "   "
                print(f"{marker} {line_no}: {line}")

# Exception classes
class MissingArgument(ValueError):
    \"\"\"Exception for missing function arguments.\"\"\"
    pass

class ExistingArgument(ValueError):
    \"\"\"Exception for conflicting function arguments.\"\"\"
    pass

# Sentinel values
NO_DEFAULT = object()  # Sentinel for arguments with no default value

# Trace event types
TRACE_EVENTS = {'get', 'set', 'call', 'return', 'exception'}