cs-py-stack 20220429

Convenience functions for the python execution stack.

I find the supplied python traceback facilities quite awkward. These functions provide convenient facilities.

Latest release 20220429: caller: return None if the stack index is out of range.

Function caller(frame_index=-3)

Return the Frame of the caller's caller. Returns None if frame_index is out of range.

Useful frame_index values:

• -1: caller, this function
• -2: invoker, who wants to know the caller
• -3: the calling function of the invoker

The default from_index value is -3.

Class Frame(Frame, builtins.tuple)

A namedtuple for stack frame contents.

Function frames()

Return the current stack as a list of Frame objects.

Function stack_dump(fp=None, indent=0, Fs=None, skip=None)

Recite current or supplied stack to fp, default sys.stderr.

Parameters:

• fp: the output file object, default sys.stderr
• indent: how many spaces to indent the stack lines, default 0
• Fs: the stack Frames to write, default obtained from the current stack
• skip: the number of Frames to trim from the end of Fs; if Fs is None this defaults to 2 to trim the Frames for the stack_dump function and its call to frames(), otherwise the default is 0 to use the supplied Frames as is

Release Log

Release 20220429: caller: return None if the stack index is out of range.

Release 20190812: stack_dump(): trim the last 2 frames from the listing by default (they are part of stack_dump's implementation).

Release 20190101:

• _Frame: rename .functionname to .funcname; caller: turn raw frames into Frames.
• caller(): accept optional frame_index, default -3.

Release 20160827: Add stack_dump().

Release 20150115: PyPI metadata fixups.

Release 20150111: Tag for initial PyPI release of cs.py.stack.