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  r79500 | benjamin.peterson | 2010-03-30 12:58:13 -0500 (Tue, 30 Mar 2010) | 4 lines

  add inspect.getcallargs, which binds function arguments like a normal call #3135

  Patch by George Sakkis
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This commit is contained in:
Benjamin Peterson 2010-03-30 18:42:32 +00:00
parent e6c9d24562
commit 25cd7eb9a1
3 changed files with 270 additions and 4 deletions
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68
Lib/inspect.py
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@ -17,7 +17,7 @@ Here are some of the useful functions provided by this module:
getmodule() - determine the module that an object came from
getclasstree() - arrange classes so as to represent their hierarchy
getargspec(), getargvalues() - get info about function arguments
getargspec(), getargvalues(), getcallargs() - get info about function arguments
getfullargspec() - same, with support for Python-3000 features
formatargspec(), formatargvalues() - format an argument spec
getouterframes(), getinnerframes() - get info about frames
@ -33,6 +33,7 @@ __date__ = '1 Jan 2001'
import sys
import os
import types
import itertools
import string
import re
import dis
@ -926,6 +927,71 @@ def formatargvalues(args, varargs, varkw, locals,
specs.append(formatvarkw(varkw) + formatvalue(locals[varkw]))
return '(' + ', '.join(specs) + ')'
def getcallargs(func, *positional, **named):
"""Get the mapping of arguments to values.
A dict is returned, with keys the function argument names (including the
names of the * and ** arguments, if any), and values the respective bound
values from 'positional' and 'named'."""
spec = getfullargspec(func)
args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults, ann = spec
f_name = func.__name__
arg2value = {}
if ismethod(func) and func.__self__ is not None:
# implicit 'self' (or 'cls' for classmethods) argument
positional = (func.__self__,) + positional
num_pos = len(positional)
num_total = num_pos + len(named)
num_args = len(args)
num_defaults = len(defaults) if defaults else 0
for arg, value in zip(args, positional):
arg2value[arg] = value
if varargs:
if num_pos > num_args:
arg2value[varargs] = positional[-(num_pos-num_args):]
else:
arg2value[varargs] = ()
elif 0 < num_args < num_pos:
raise TypeError('%s() takes %s %d %s (%d given)' % (
f_name, 'at most' if defaults else 'exactly', num_args,
'arguments' if num_args > 1 else 'argument', num_total))
elif num_args == 0 and num_total:
raise TypeError('%s() takes no arguments (%d given)' %
(f_name, num_total))
for arg in itertools.chain(args, kwonlyargs):
if arg in named:
if arg in arg2value:
raise TypeError("%s() got multiple values for keyword "
"argument '%s'" % (f_name, arg))
else:
arg2value[arg] = named.pop(arg)
for kwonlyarg in kwonlyargs:
if kwonlyarg not in arg2value:
try:
arg2value[kwonlyarg] = kwonlydefaults[kwonlyarg]
except KeyError:
raise TypeError("%s() needs keyword-only argument %s" %
(f_name, kwonlyarg))
if defaults: # fill in any missing values with the defaults
for arg, value in zip(args[-num_defaults:], defaults):
if arg not in arg2value:
arg2value[arg] = value
if varkw:
arg2value[varkw] = named
elif named:
unexpected = next(iter(named))
raise TypeError("%s() got an unexpected keyword argument '%s'" %
(f_name, unexpected))
unassigned = num_args - len([arg for arg in args if arg in arg2value])
if unassigned:
num_required = num_args - num_defaults
raise TypeError('%s() takes %s %d %s (%d given)' % (
f_name, 'at least' if defaults else 'exactly', num_required,
'arguments' if num_required > 1 else 'argument', num_total))
return arg2value
# -------------------------------------------------- stack frame extraction
Traceback = namedtuple('Traceback', 'filename lineno function code_context index')