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The Python Debugger Pdb
=======================
To use the debugger in its simplest form:
>>> import pdb
>>> pdb.run('')
The debugger's prompt is '(Pdb) '. This will stop in the first
function call in .
Alternatively, if a statement terminated with an unhandled exception,
you can use pdb's post-mortem facility to inspect the contents of the
traceback:
>>>
>>> import pdb
>>> pdb.pm()
The commands recognized by the debugger are listed in the next
section. Most can be abbreviated as indicated; e.g., h(elp) means
that 'help' can be typed as 'h' or 'help' (but not as 'he' or 'hel',
nor as 'H' or 'Help' or 'HELP'). Optional arguments are enclosed in
square brackets. Alternatives in the command syntax are separated
by a vertical bar (|).
A blank line repeats the previous command literally, except for
'list', where it lists the next 11 lines.
Commands that the debugger doesn't recognize are assumed to be Python
statements and are executed in the context of the program being
debugged. Python statements can also be prefixed with an exclamation
point ('!'). This is a powerful way to inspect the program being
debugged; it is even possible to change variables or call functions.
When an exception occurs in such a statement, the exception name is
printed but the debugger's state is not changed.
The debugger supports aliases, which can save typing. And aliases can
have parameters (see the alias help entry) which allows one a certain
level of adaptability to the context under examination.
Multiple commands may be entered on a single line, separated by the
pair ';;'. No intelligence is applied to separating the commands; the
input is split at the first ';;', even if it is in the middle of a
quoted string.
If a file ".pdbrc" exists in your home directory or in the current
directory, it is read in and executed as if it had been typed at the
debugger prompt. This is particularly useful for aliases. If both
files exist, the one in the home directory is read first and aliases
defined there can be overriden by the local file.
Aside from aliases, the debugger is not directly programmable; but it
is implemented as a class from which you can derive your own debugger
class, which you can make as fancy as you like.
Debugger commands
=================
Nc @ s e Z d Z d Z d S)RestartzBCauses a debugger to be restarted for the debugged python program.N)__name__
__module__ __qualname____doc__ r r (/opt/alt/python34/lib64/python3.4/pdb.pyr T s r runpmPdbrunevalrunctxruncall set_trace post_mortemhelpc C s t j d t j | } y t | } Wn t k
rD d SYn X| D x< t | d d D]( \ } } | j | r_ | | | f Sq_ WWd QXd S)Nzdef\s+%s\s*[(]start )recompileescapeopenOSError enumeratematch)funcnamefilenameZcrefplinenoliner r r
find_function[ s
r c C sz t j | \ } } t j | r@ | j | j k r@ | d f St j | rY | d f St j | | d | d f S)Nr )inspectZ
findsourceZisframe f_globalsf_localsZismoduleZgetblock)objlinesr r r r getsourcelinesh s !
r& c C sJ t t j | } | j x$ | D] \ } } | | k r& | Sq& Wd S)Nr )listdisZfindlinestartsreverse)codeZlastiZ
linestartsir r r r lasti2linenoq s
r, c @ s" e Z d Z d Z d d Z d S)_rstrz#String that doesn't quote its repr.c C s | S)Nr )selfr r r __repr__| s z_rstr.__repr__N)r r r r r/ r r r r r- z s r- z
-> c @ s e Z d Z d d d d d d d Z d d Z d d Z d
d Z d d
Z d d Z d d Z d d Z
d d Z d d Z d d Z
d d Z d d Z d d Z d d! Z d" d# Z d$ d% Z d& d' Z d( d) Z d* d+ Z d, d- Z d. d/ Z d0 d1 Z d2 d3 Z d4 d5 Z e Z d6 d7 d8 Z d9 d: Z e Z e Z e Z! d; d< Z" e Z# d= d> Z$ d? d@ Z% dA dB Z& e Z' dC dD Z( e Z) dE dF Z* e Z+ dG dH Z, e Z- dI dJ Z. e. Z/ e Z0 e Z1 dK dL Z2 e2 Z3 e2 Z4 dM dN Z5 dO dP Z6 e6 Z7 dQ dR Z8 e8 Z9 dS dT Z: e: Z; dU dV Z< e< Z= dW dX Z> e> Z? dY dZ Z@ e@ ZA d[ d\ ZB eB ZC d] d^ ZD eD ZE ZF d_ d` ZG eG ZH da db ZI e ZJ dc dd ZK eK ZL eK ZM de df ZN dg dh ZO eO ZP di dj ZQ eQ ZR dk dl ZS d dm dn ZT do dp ZU dq dr ZV e ZW e ZX e ZY ds dt ZZ eZ Z[ du dv Z\ e\ Z] dw dx Z^ e Z_ f d dy dz Z` d{ d| Za e Zb d} d~ Zc e Zd d d Ze d d Zf d d Zg d d Zh d d Zi d d Zj d d d d d d g Zk d d Zl em d d Zn d d Zo eo Zp d d Zq d d Zr d d Zs d d Zt d S)r ZtabNFc # C s t j j | d | t j j | | | | | rA d | _ n d | _ i | _ i | _ d | _ d | _
i | _ y d d l } | j
d Wn t k
r Yn Xd | _ | | _ g | _ d t j k r0t j d } y8 t t j j | d } | j j | Wd QXWq0t k
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rmYn Xi | _ i | _ i | _ d | _ d | _ d S) Nskipr z(Pdb) Fz
`@#$%^&*()=+[{]}\|;:'",<>?HOMEz.pdbrc) bdbBdb__init__cmdCmdZ use_rawinputpromptaliases
displaying
mainpyfile_wait_for_mainpyfile tb_linenoreadlineZset_completer_delims ImportError allow_kbdintnosigintrcLinesosenvironr pathjoinextendr commandscommands_dopromptcommands_silentcommands_defining
commands_bnum) r. completekeystdinstdoutr0 rA r> ZenvHomeZrcFiler r r r5 sF
z Pdb.__init__c C sP | j r t n | j d | j | j | t j t j | j d S)Nz-
Program interrupted. (Use 'cont' to resume).)r@ KeyboardInterruptmessageset_stepr signalSIGINT_previous_sigint_handler)r. Zsignumframer r r sigint_handler s
zPdb.sigint_handlerc C s t j j | | j d S)N)r3 r4 resetforget)r. r r r rX s z Pdb.resetc C s5 d | _ g | _ d | _ d | _ | j j d S)Nr )r stackcurindexcurframer= clear)r. r r r rY s
z
Pdb.forgetc C s | j | j | | \ | _ | _ x; | re t | j j | j } | | j | j <| j } q+ W| j | j d | _
| j
j | _ | j
S)Nr )rY Z get_stackrZ r[ r, tb_framef_codetb_lastir= tb_nextr\ r# curframe_locals execRcLines)r. ftbr r r r setup s
z Pdb.setupc C s | j s
d S| j } | j g | _ x] | r | j j } | r, | d d k r, | j | r | j t | 7_ d Sq, q, Wd S)Nr #T)rB r) popstriponecmdreversed)r. rB r r r r rc s
zPdb.execRcLinesc C s@ | j r
d S| j | r< | j d | j | d n d S)znThis method is called when there is the remote possibility
that we ever need to stop in this function.Nz--Call--)r< Z stop_hererQ interaction)r. rV Z
argument_listr r r user_call s
z
Pdb.user_callc C sl | j rF | j | j | j j k s6 | j d k r: d Sd | _ n | j | rh | j | d n d S)z;This function is called when we stop or break at this line.r NF)r< r; canonicr_ co_filenamef_lineno bp_commandsrl )r. rV r r r user_line s z
Pdb.user_linec C s t | d d r | j | j k r | j } d | _ | j } | j | d x" | j | D] } | j | q] W| | _ | j | s | j | j | j n | j
| r | j n | j d Sd S)zCall every command that was set for the current active breakpoint
(if there is one).
Returns True if the normal interaction function must be called,
False otherwise. currentbpFr Nr )
getattrrs rH lastcmdrf rj rJ print_stack_entryrZ r[ rI _cmdlooprY )r. rV rs Z lastcmd_backr r r r rq s
zPdb.bp_commandsc C s; | j r
d S| | j d <| j d | j | d d S)z7This function is called when a return trap is set here.N
__return__z
--Return--)r< r# rQ rl )r. rV Z return_valuer r r user_return s
zPdb.user_returnc C s | j r
d S| \ } } } | | f | j d <| rH | t k rH d n d } | j d | t j | | d j f | j | | d S)zoThis function is called if an exception occurs,
but only if we are to stop at or just below this level.NZ
__exception__z Internal r1 z%s%sr )r< r#
StopIterationrQ tracebackformat_exception_onlyri rl )r. rV exc_infoexc_type exc_value
exc_tracebackprefixr r r user_exception% s !zPdb.user_exceptionc C sN xG y! d | _ | j d | _ PWq t k
rE | j d Yq Xq Wd S)NTFz--KeyboardInterrupt--)r@ cmdlooprP rQ )r. r r r rw 9 s
z Pdb._cmdloopc C s | j j | j } | r xk | j D]Z \ } } | j | } | | k r( | | k r( | | | <| j d | | | f q( q( Wn d S)Nzdisplay %s: %r [old: %r])r: getr\ items_getval_exceptrQ )r. r: exprZoldvalueZnewvaluer r r preloopF s
z Pdb.preloopc C sO | j | | r | j d S| j | j | j | j | j d S)N)rf rY rv rZ r[ rw )r. rV r| r r r rl S s
zPdb.interactionc C s& | d k r" | j t | n d S)z{Custom displayhook for the exec in default(), which prevents
assignment of the _ variable in the builtins.
N)rQ repr)r. r$ r r r displayhook] s zPdb.displayhookc C s | d d d k r) | d d } n | j } | j j } y t | d d d } t j } t j } t j } z8 | j t _ | j t _ | j t _ t | | | Wd | t _ | t _ | t _ XWn> t j d d } | j
t j | d j
Yn Xd S)Nr !
zZsingle rz )rb r\ r" r sysrO rN r execr~ errorr| r} ri ) r. r localsglobalsr* Z save_stdoutZ
save_stdinZsave_displayhookr~ r r r defaulte s( z Pdb.defaultc C s4 | j s | S| j } x | d | j k r | j | d } d } x> | d d D], } | j d t | | } | d 7} qZ W| j d d j | d d } | j } q W| d d k r0| j d } | d k r0| | d d j } | j j | | d | j
} q0n | S)
z*Handle alias expansion and ';;' separator.r r N%z%* aliasz;;r ) ri splitr9 replacestrrF findlstripcmdqueueappendrstrip)r. r argsZiiZtmpArgZmarkernextr r r precmd{ s& % z
Pdb.precmdc C s- | j s t j j | | S| j | Sd S)zInterpret the argument as though it had been typed in response
to the prompt.
Checks whether this line is typed at the normal prompt or in
a breakpoint command list definition.
N)rK r6 r7 rj handle_command_def)r. r r r r rj s z
Pdb.onecmdc C s | j | \ } } } | s" d S| d k rB d | j | j s z*Pdb._complete_bpnumber..)r r3
Breakpoint
bpbynumber)r. r r r r r )r r _complete_bpnumber s zPdb._complete_bpnumberc s | j s
g S| j j j } | j | j d k r j d y< | d } x' d d D] } t | | } ql WWn t t f k
r g SYn Xd j d d d f d d t
| D S f d d | j D Sd S) N.r r c s- g | ]# } | j d r | q S)r rz )r )r n)dottedr r r r s z,Pdb._complete_expression..c s% g | ] } | j r | q Sr )r )r r )r r r r s rz rz ) r\ r" copyupdaterb r rt KeyErrorr rF dirkeys)r. r r r r nsr$ partr )r r r r r s zPdb._complete_expressionc C sz | s t t j j d } n, y t | } Wn | j d d SYn X| | _ | | j k r | j | | j | | j | f } n d } g | j | )r\ r_ ro r; )r. r r r r r s zPdb.defaultFilec C s | j | d d S)ztbreak [ ([filename:]lineno | function) [, condition] ]
Same arguments as break, but sets a temporary breakpoint: it
is automatically deleted when first hit.
r N)r )r. r r r r do_tbreak s z
Pdb.do_tbreakc
C s" d } | j d } t | d k r: | d j } n) t | d k r_ | d j } n | S| d k rs | S| j d } | d d k r | d =t | d k r | Sn | j } t | d k r | d } n, | j | d } | r | } n | d } t | | } | p!| S) N'r r r1 r r. )NNN)r r ri r r r )
r. Z
identifierZfailedZidstringidpartsZfnameitemrd Zanswerr r r r s.
z Pdb.lineinfoc C s t | d r | j j n d } t j | | | } | sM | j d d S| j } | s | d d k s | d d d k s | d d d k r | j d d S| S)
zCheck whether specified line seems to be executable.
Return `lineno` if it is, 0 if not (e.g. a docstring, comment, blank
line or EOF). Warning: testing is not comprehensive.
r\ Nz End of filer rg r z"""z'''zBlank or comment)r r\ r" linecachegetlinerQ ri r )r. r r r r r r r r s !
,
z
Pdb.checklinec C s | j } xq | D]i } y | j | } Wn2 t k
r` } z | j | WYd d } ~ Xq X| j | j d | q Wd S)zenable bpnumber [bpnumber ...]
Enables the breakpoints given as a space separated list of
breakpoint numbers.
Nz
Enabled %s)r get_bpbynumberr r enablerQ )r. r r r+ r r r r r do_enable s
z
Pdb.do_enablec C s | j } xq | D]i } y | j | } Wn2 t k
r` } z | j | WYd d } ~ Xq X| j | j d | q Wd S)aN disable bpnumber [bpnumber ...]
Disables the breakpoints given as a space separated list of
breakpoint numbers. Disabling a breakpoint means it cannot
cause the program to stop execution, but unlike clearing a
breakpoint, it remains in the list of breakpoints and can be
(re-)enabled.
Nz Disabled %s)r r r r disablerQ )r. r r r+ r r r r r
do_disable s
zPdb.do_disablec C s | j d d } y | d } Wn t k
r: d } Yn Xy | j | d j } WnP t k
ry | j d Ynl t k
r } z | j | WYd d } ~ Xn; X| | _ | s | j d | j n | j d | j d S)a# condition bpnumber [condition]
Set a new condition for the breakpoint, an expression which
must evaluate to true before the breakpoint is honored. If
condition is absent, any existing condition is removed; i.e.,
the breakpoint is made unconditional.
r r Nr zBreakpoint number expectedz#Breakpoint %d is now unconditional.z$New condition set for breakpoint %d.) r
IndexErrorr ri r r r rQ r )r. r r r r r r r r do_condition s
zPdb.do_conditionc C s | j } y t | d j } Wn d } Yn Xy | j | d j } WnP t k
ru | j d Yn t k
r } z | j | WYd d } ~ Xnf X| | _ | d k r | d k r d | } n d } | j d | | j f n | j d | j d S) a ignore bpnumber [count]
Set the ignore count for the given breakpoint number. If
count is omitted, the ignore count is set to 0. A breakpoint
becomes active when the ignore count is zero. When non-zero,
the count is decremented each time the breakpoint is reached
and the breakpoint is not disabled and any associated
condition evaluates to true.
r r zBreakpoint number expectedNz %d crossingsz
1 crossingz%Will ignore next %s of breakpoint %d.z-Will stop next time breakpoint %d is reached.)
r r ri r r r r ignorerQ r )r. r r countr r Zcountstrr r r do_ignore6 s(
z
Pdb.do_ignorec
! C s | s y t d } Wn t k
r0 d } Yn X| j j } | d k r d d t j j D } | j x" | D] } | j d | qy Wn d Sd | k ri| j d } | d | } | | d
d } y t
| } Wn t k
rd | } Yn% X| j | | } | j
| | } | rC| j | n" x | D] } | j d | qJWd S| j } xt | D]l } y | j | } Wn2 t k
r} z | j | WYd d } ~ Xq|X| j | | j d | q|Wd S)
a= cl(ear) filename:lineno
cl(ear) [bpnumber [bpnumber...]]
With a space separated list of breakpoint numbers, clear
those breakpoints. Without argument, clear all breaks (but
first ask confirmation). With a filename:lineno argument,
clear all breaks at that line in that file.
zClear all breaks? noyyesc S s g | ] } | r | q Sr r )r r r r r r g s z Pdb.do_clear..z
Deleted %sNr r zInvalid line number (%s))r zyes)inputEOFErrorri r r3 r r Zclear_all_breaksrQ r r r r Z clear_breakr r r Zclear_bpbynumber)
r. r ZreplyZbplistr r+ r r r Z
numberlistr r r do_clearY sF
z Pdb.do_clearc C s | j d S)zw(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.
N)print_stack_trace)r. r r r r do_where s z Pdb.do_wherec C s~ d | k o t | j k n s+ t | | _ | j | j d | _ | j j | _ | j | j | j d | _ d S)Nr ) r rZ AssertionErrorr[ r\ r# rb rv r )r. r r r r
_select_frame s + zPdb._select_framec C s | j d k r | j d d Sy t | p/ d } Wn' t k
r_ | j d | d SYn X| d k ru d } n t d | j | } | j | d S)zu(p) [count]
Move the current frame count (default one) levels up in the
stack trace (to an older frame).
r z Oldest frameNr zInvalid frame count (%s))r[ r r r maxr )r. r r newframer r r do_up s
z Pdb.do_upc C s | j d t | j k r- | j d d Sy t | p< d } Wn' t k
rl | j d | d SYn X| d k r t | j d } n# t t | j d | j | } | j | d S)zd(own) [count]
Move the current frame count (default one) levels down in the
stack trace (to a newer frame).
r z Newest frameNzInvalid frame count (%s)r )r[ r rZ r r r minr )r. r r r r r r do_down s
#z Pdb.do_downc C s | rf y t | } Wn' t k
r? | j d | d SYn X| | j j k rl | j d d Sn d } | j | j | d S)aN unt(il) [lineno]
Without argument, continue execution until the line with a
number greater than the current one is reached. With a line
number, continue execution until a line with a number greater
or equal to that is reached. In both cases, also stop when
the current frame returns.
zError in argument: %rNz7"until" line number is smaller than current line numberr )r r r r\ rp Z set_until)r. r r r r r do_until s
z Pdb.do_untilc C s | j d S)zs(tep)
Execute the current line, stop at the first possible occasion
(either in a function that is called or in the current
function).
r )rR )r. r r r r do_step s
z Pdb.do_stepc C s | j | j d S)zxn(ext)
Continue execution until the next line in the current function
is reached or it returns.
r )Zset_nextr\ )r. r r r r do_next s z Pdb.do_nextc C sW | rM d d l } t j d d } | j | t _ | t j d d ".
If an exception is being debugged, the line where the
exception was originally raised or propagated is indicated by
">>", if it differs from the current line.
r' Nr r r zError in argument: %r
z[EOF])ru r r ri r r r r r\ rp r_ ro get_file_breaksr getlinesr" _print_linesr r rQ rP )r. r lastfirstr breaklistr% r r r do_list s>
z Pdb.do_listc C s | j j j } | j | } y t | j \ } } Wn6 t k
ro } z | j | d SWYd d } ~ Xn X| j | | | | j d S)z\longlist | ll
List the whole source code for the current function or frame.
N)r\ r_ ro r, r& r r r. )r. r r r1 r% r r r r r do_longlist s
zPdb.do_longlistc C s y | j | } Wn d SYn Xy t | \ } } Wn< t t f k
rv } z | j | d SWYd d } ~ Xn X| j | | d S)z^source expression
Try to get source code for the given object and display it.
N)r& r& r TypeErrorr r. )r. r r$ r% r r r r r do_source s
z
Pdb.do_sourcec
C s | r' | j } | j j | d
} n
d } } x t | | D] \ } } t | j d } t | d k r | d 7} n | | k r | d 7} n
| d 7} | | k r | d 7} n | | k r | d 7} n | j | d | j qA Wd S) zPrint a range of lines.r r r r Bz->z>> Nrz rz ) rp r= r r r rjustr rQ r )
r. r% r r rV Zcurrent_linenoZ
exc_linenor r sr r r r. s
zPdb._print_linesc C s y | j | } Wn d SYn Xd } y
| j } Wn t k
rI Yn X| rh | j d | j d Sy | j j } Wn t k
r Yn X| r | j d | j d S| j t k r | j d | j | j f d S| j t | d S)z;whatis arg
Print the type of the argument.
Nz Function %sz Method %sz Class %s.%s)
r& r r rQ r r __class__typer r )r. r valuer* r r r do_whatis s.
z
Pdb.do_whatisc C s | sP | j d x| | j j | j i j D] } | j d | q2 WnB | j | } | | j j | j i | <| j d | | f d S)zdisplay [expression]
Display the value of the expression if it changed, each time execution
stops in the current frame.
Without expression, list all display expressions for the current frame.
zCurrently displaying:z%s: %rzdisplay %s: %rN)rQ r: r r\ r r
setdefault)r. r r valr r r
do_display. s
% zPdb.do_displayc C sf | rL y | j j | j i | =Wqb t k
rH | j d | Yqb Xn | j j | j d d S)zundisplay [expression]
Do not display the expression any more in the current frame.
Without expression, clear all display expressions for the current frame.
znot displaying %sN)r: r r\ r r rh )r. r r r r do_undisplayA s
zPdb.do_undisplayc s) f d d | j j | j i D S)Nc s% g | ] } | j r | q Sr )r )r r )r r r r Q s z*Pdb.complete_undisplay..)r: r r\ )r. r r r r r )r r complete_undisplayP s zPdb.complete_undisplayc C s9 | j j j } | j | j t j d d | d S)zinteract
Start an interactive interpreter whose global namespace
contains all the (global and local) names found in the current scope.
z
*interactive*ZlocalN)r\ r" r r rb r* interact)r. r r r r r do_interactT s zPdb.do_interactc C s | j } t | d k rf t | j j } x, | D]$ } | j d | | j | f q: Wd S| d | j k r t | d k r | j d | d | j | d f n$ d j | d d | j | d .)r9 )r. r r r r r )r r complete_unalias s zPdb.complete_unaliasr r
r r r r c C s> y% x | j D] } | j | q
WWn t k
r9 Yn Xd S)N)rZ rv rP )r. frame_linenor r r r s
zPdb.print_stack_tracec C sK | \ } } | | j k r$ d } n d } | j | | j | | d S)Nz> z )r\ rQ Zformat_stack_entry)r. rJ Z
prompt_prefixrV r r r r r rv s zPdb.print_stack_entryc C s | s t j j | | SyJ y t | d | } | SWn% t k
ra t | d | } Yn XWn# t k
r | j d | Yn> Xt j j d k r | j d | d S| j | j
j d S)zh(elp)
Without argument, print the list of available commands.
With a command name as argument, print help about that command.
"help pdb" shows the full pdb documentation.
"help exec" gives help on the ! command.
Zhelp_r zNo help for %rr zJNo help for %r; please do not run Python with -OO if you need command helpN) r6 r7 do_helprt r r r flagsoptimizerQ r r )r. r ZtopicZcommandr r r rK s
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Debug the Python program given by pyfile.
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