format function arguments and keyword arguments special case for a single parameter hello is formatted as hello use reprlib to limit the length of the output replacement for traceback extractstack that only does the necessary work for asyncio debug mode limit the amount of work to a reasonable amount as extractstack can be called for each coroutine and future in debug mode format function arguments and keyword arguments special case for a single parameter hello is formatted as hello use reprlib to limit the length of the output replacement for traceback extract_stack that only does the necessary work for asyncio debug mode limit the amount of work to a reasonable amount as extract_stack can be called for each coroutine and future in debug mode
import functools
import inspect
import reprlib
import sys
import traceback

from . import constants


def _get_function_source(func):
    func = inspect.unwrap(func)
    if inspect.isfunction(func):
        code = func.__code__
        return (code.co_filename, code.co_firstlineno)
    if isinstance(func, functools.partial):
        return _get_function_source(func.func)
    if isinstance(func, functools.partialmethod):
        return _get_function_source(func.func)
    return None


def _format_callback_source(func, args):
    func_repr = _format_callback(func, args, None)
    source = _get_function_source(func)
    if source:
        func_repr += f' at {source[0]}:{source[1]}'
    return func_repr


def _format_args_and_kwargs(args, kwargs):
    
    
    items = []
    if args:
        items.extend(reprlib.repr(arg) for arg in args)
    if kwargs:
        items.extend(f'{k}={reprlib.repr(v)}' for k, v in kwargs.items())
    return '({})'.format(', '.join(items))


def _format_callback(func, args, kwargs, suffix=''):
    if isinstance(func, functools.partial):
        suffix = _format_args_and_kwargs(args, kwargs) + suffix
        return _format_callback(func.func, func.args, func.keywords, suffix)

    if hasattr(func, '__qualname__') and func.__qualname__:
        func_repr = func.__qualname__
    elif hasattr(func, '__name__') and func.__name__:
        func_repr = func.__name__
    else:
        func_repr = repr(func)

    func_repr += _format_args_and_kwargs(args, kwargs)
    if suffix:
        func_repr += suffix
    return func_repr


def extract_stack(f=None, limit=None):
    
    if f is None:
        f = sys._getframe().f_back
    if limit is None:
        
        
        limit = constants.DEBUG_STACK_DEPTH
    stack = traceback.StackSummary.extract(traceback.walk_stack(f),
                                           limit=limit,
                                           lookup_lines=False)
    stack.reverse()
    return stack