Module: core.debugger

Pdb debugger class.

Modified from the standard pdb.Pdb class to avoid including readline, so that the command line completion of other programs which include this isn’t damaged.

In the future, this class will be expanded with improvements over the standard pdb.

The code in this file is mainly lifted out of cmd.py in Python 2.2, with minor changes. Licensing should therefore be under the standard Python terms. For details on the PSF (Python Software Foundation) standard license, see:

http://www.python.org/2.2.3/license.html

2 Classes

class IPython.core.debugger.Tracer(colors=None)

Bases: object

DEPRECATED

Class for local debugging, similar to pdb.set_trace.

Instances of this class, when called, behave like pdb.set_trace, but providing IPython’s enhanced capabilities.

This is implemented as a class which must be initialized in your own code and not as a standalone function because we need to detect at runtime whether IPython is already active or not. That detection is done in the constructor, ensuring that this code plays nicely with a running IPython, while functioning acceptably (though with limitations) if outside of it.

__init__(colors=None)

DEPRECATED

Create a local debugger instance.

Parameters:colors (str, optional) – The name of the color scheme to use, it must be one of IPython’s valid color schemes. If not given, the function will default to the current IPython scheme when running inside IPython, and to ‘NoColor’ otherwise.

Examples

from IPython.core.debugger import Tracer; debug_here = Tracer()

Later in your code:

debug_here()  # -> will open up the debugger at that point.

Once the debugger activates, you can use all of its regular commands to step through code, set breakpoints, etc. See the pdb documentation from the Python standard library for usage details.

__call__()

Starts an interactive debugger at the point where called.

This is similar to the pdb.set_trace() function from the std lib, but using IPython’s enhanced debugger.

class IPython.core.debugger.Pdb(color_scheme=None, completekey=None, stdin=None, stdout=None, context=5)

Bases: pdb.Pdb, object

Modified Pdb class, does not load readline.

for a standalone version that uses prompt_toolkit, see IPython.terminal.debugger.TerminalPdb and IPython.terminal.debugger.set_trace()

__init__(color_scheme=None, completekey=None, stdin=None, stdout=None, context=5)
do_d(*args, **kw)

d(own) [count] Move the current frame count (default one) levels down in the stack trace (to a newer frame).

do_down(*args, **kw)

d(own) [count] Move the current frame count (default one) levels down in the stack trace (to a newer frame).

do_pdef(arg)

Print the call signature for any callable object.

The debugger interface to %pdef

do_pdoc(arg)

Print the docstring for an object.

The debugger interface to %pdoc.

do_pfile(arg)

Print (or run through pager) the file where an object is defined.

The debugger interface to %pfile.

do_pinfo(arg)

Provide detailed information about an object.

The debugger interface to %pinfo, i.e., obj?.

do_pinfo2(arg)

Provide extra detailed information about an object.

The debugger interface to %pinfo2, i.e., obj??.

do_psource(arg)

Print (or run through pager) the source code for an object.

do_q(*args, **kw)

q(uit) exit

Quit from the debugger. The program being executed is aborted.
do_quit(*args, **kw)

q(uit) exit

Quit from the debugger. The program being executed is aborted.
do_u(*args, **kw)

u(p) [count] Move the current frame count (default one) levels up in the stack trace (to an older frame).

do_up(*args, **kw)

u(p) [count] Move the current frame count (default one) levels up in the stack trace (to an older frame).

do_w(arg)

w(here) Print a stack trace, with the most recent frame at the bottom. An arrow indicates the “current frame”, which determines the context of most commands. ‘bt’ is an alias for this command.

Take a number as argument as an (optional) number of context line to print

do_where(arg)

w(here) Print a stack trace, with the most recent frame at the bottom. An arrow indicates the “current frame”, which determines the context of most commands. ‘bt’ is an alias for this command.

Take a number as argument as an (optional) number of context line to print

new_do_restart(arg)

Restart command. In the context of ipython this is exactly the same thing as ‘quit’.

print_list_lines(filename, first, last)

The printing (as opposed to the parsing part of a ‘list’ command.

set_colors(scheme)

Shorthand access to the color table scheme selector method.

4 Functions

IPython.core.debugger.make_arrow(pad)

generate the leading arrow in front of traceback or debugger

IPython.core.debugger.BdbQuit_excepthook(et, ev, tb, excepthook=None)

Exception hook which handles BdbQuit exceptions.

All other exceptions are processed using the excepthook parameter.

IPython.core.debugger.BdbQuit_IPython_excepthook(self, et, ev, tb, tb_offset=None)
IPython.core.debugger.decorate_fn_with_doc(new_fn, old_fn, additional_text='')

Make new_fn have old_fn’s doc string. This is particularly useful for the do_... commands that hook into the help system. Adapted from from a comp.lang.python posting by Duncan Booth.