Linux Certif

Toute la documentation sur la certification Linux LPI

pydb

NAME

pydb - enhanced Python debugger

SYNOPSIS

pydb [debugger-options] python-script [script-options...]

DESCRIPTION

This manual page documents briefly the pydb command.

pydb is an extended Python debugger. It extends the Python standard debugger pdb and is suited for use with the graphical debugger DDD. The purpose of a debugger such as this one is to allow you to see what is going on ``inside'' another program while it executes---or what another program was doing at the moment it crashed.

We follow gdb's command set unless there's good reason not to.

pydb can do four main kinds of things (plus other things in support of these) to help you catch bugs in the act:

   •

Start or restart your Python script, specifying arguments that might affect its behavior.

   •

Make your program stop at various points possibly determined by specified conditions.

   •

Examine what has happened when your program has stopped.

   •

Change things in your program, so you can experiment with correcting the effects of one bug and go on to learn about another.

Here are some of the most frequently-needed commands:

break [file:line|function]

Set a breakpoint at function or at the specified file and line.

clear [file:line|function]

Clear a breakpoint at function or at the specified file and line.

continue

Continue running your program (after stopping, e.g. at a breakpoint).

delete [breakpoint-numbers]

Delete breakpoints by number.

disassemble [location]

Disassemble Python instructions

examine expr

Give type/object and value information about expression.

finish

Run until the completion of the current function or method.

frame frame-number

Set the stack frame to frame-number for purposes of examinine local variables. For positioning relative to the current frame, use up or down.

help [name]

Show information about pydb command name, or general information about using pydb.

info [name]

Get the various information usually about the debugged program.

list [file:line|function]

type the text of the program in the vicinity of where it is presently stopped or at the specified function or file and line.

next [count]

Execute next program line(s) (after stopping); step over any function calls in the line.

pp expr

Pretty print the value of an expression.

print expr

Display the value of an expression.

source filename

Read and execute the lines in file filename as a series of debugger commands.

quit

Exit from the debugger.

run [arglist]

(Re)start your program (with arglist, if specified). If you want the debugger to get reloaded, use restart instead.

set

Modify parts of the debugger environment.

shell command

Run a shell command.

show

See the debugger environment settings

step [count]

Execute next program line(s) (after stopping); step into any function calls in the line.

where [count]

Display all or count items of the program stack.

For full details on pydb, see http://bashdb.sourceforge.net/pydb/pydb/index.html

OPTIONS

-h | --help

show invocation help and exit

--version

show the version number and exit

-n | --nx

Don't execute commands found in any initialization files

--batch

Don't run interactive commands on debugger entry

--cd=DIR

Change current directory to DIR.

-x | --command=FILE

Execute commands from FILE

-e | --exec

Run debugger commands command-list. Commands should be separated by ";;"-the same as you would do inside the debugger. You may need to quote this option to prevent command shell interpretation, e.g. --exec "break 20;; continue"

--error=FILE

Write debugger's error output (stderr) to FILE

-A | --annotate=LEVEL

Set gdb-like annotation_level. The annotation level is used by front-ends to get posted about program information when things change without having to poll for the information.

--basename

Report file locations as only the base filename, and omit the directory name. This is useful in running regression tests.

-o | --output=FILE

Write debugger's output (stdout) to FILE

-X | --trace

Show lines before executing them. This option also sets --batch.

SEE ALSO

/build/buildd/pydb-1.23/debian/pydb/usr/lib/python2.4/site-packages/pydb.doc http://bashdb.sourceforge.net/pydb/

AUTHOR

pydb was written by Richard Wolff <rwolff@noao.edu> (now retired) based on the standard Python debugger pdb.py. Over the many years, pdb.py and pydb.py have diverged. It was subsequently revised and expanded to be more like gdb by Rocky Bernstein <rockyb@users.sourceforge.net>

The first version of this manual page was written by Gregor Hoffleit <flight@debian.org> for the Debian project (but may be used by others).