On Sat, Apr 28, 2018 at 4:27 AM, Steven D'Aprano <[email protected]>
wrote:
> On Fri, Apr 27, 2018 at 06:27:44AM -0700, Eric Fahlgren wrote:
>
> > I've had a 'dprint' in sitecustomize for years. It clones 'print' and
> adds
> > a couple of keyword parameters, 'show_stack' and 'depth', which give
> > control over traceback output (walks back up sys._getframe for 'depth'
> > entries). It returns the final argument if there is one, otherwise None.
> > It can be used anywhere and everywhere that builtin print is used, plus
> > anywhere in any expression just passing a single argument.
>
> Is this published anywhere?
>
>
Sorry, no, it's part of work code, but it's pretty simple stuff.
'get_stack' is a debug-quality stack dumper (my memory failed, now uses
inspect instead of the more primitive sys._getframe), used whenever anyone
wants to see where they are. The 'all' parameter lets you filter out some
stdlib entries.
def get_stack(all=False, skip=0, depth=0):
stack = inspect.stack()[1:] # Implicitly ignore the frame containing
get_stack.
stack.reverse() # And make it oldest first.
length = len(stack)
upper = length - skip
lower = (upper - depth) if depth else 0
max_len = 0
for i_frame in range(lower, upper):
# Preprocessing loop to format the output frames and
# calculate the length of the fields in the output.
stack[i_frame] = list(stack[i_frame])
path = _cleaner().clean(stack[i_frame][1]) # Canonical form for
paths...
if all or '/SITE-P' not in path.upper() and '<FROZEN ' not in
path.upper():
max_len = max(max_len, len(path))
stack[i_frame][1] = path
formatted_frames = list()
for i_frame, frame in enumerate(stack[lower:upper], lower+1):
# Now that we know max_len, we can do the actual formatting.
if all or '/SITE-P' not in frame[1].upper() and '<FROZEN ' not in
frame[1].upper():
formatted_frames.append('%02d/%02d %*s %4d %s%s' % (i_frame,
length, -max_len, frame[1], lineNo, frame[3]))
return ''.join(formatted_frames)
Off the top of my head, dprint looks like this:
def dprint(*args, **kwds):
depth = kwds.pop('depth', 0)
show_stack = kwds.pop('show_stack', False)
print(*args, **kwds)
if show_stack:
print(get_stack(depth=depth))
return args[-1] if args else None
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