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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 overridden by the local file. This behavior can be disabled by passing the "readrc=False" argument to the Pdb constructor. 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. 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(Use 'cont' to resume).)rEKeyboardInterruptmessageset_stepr)r1Zsignumframerrrsigint_handlers  zPdb.sigint_handlercCstj||dSr/)r6r7resetforgetr0rrrrYs z Pdb.resetcCs&d|_g|_d|_d|_|jdSr')rstackcurindexcurframerBclearr0rrrrZs z Pdb.forgetcCsh||||\|_|_|rDt|jj|j}||j|j<|j }q|j|jd|_ |j j |_ | Sr')rZZ get_stackr[r\r-tb_framef_codetb_lastirBtb_nextr]r#curframe_locals execRcLines)r1ftbrrrrsetups  z Pdb.setupcCsd|js dS|j}|g|_|r`|}|r|ddkr||r|jt|7_dSqdS)Nr#T)rGr*popstriponecmdreversed)r1rGrrrrrds  zPdb.execRcLinescCs.|jr dS||r*|d||ddS)znThis method is called when there is the remote possibility that we ever need to stop in this function.Nz--Call--)rAZ stop_hererU interaction)r1rWZ argument_listrrr user_calls   z Pdb.user_callcCsH|jr.|j||jjks$|jdkr(dSd|_||rD||ddS)z;This function is called when we stop or break at this line.rNF)rAr@canonicr` co_filenamef_lineno bp_commandsrm)r1rWrrr user_lines z Pdb.user_linecCst|ddr|j|jkr|j}d|_|j}||d|j|D]}||q@||_|j|sr||j|j |j |r| | dSdS)zCall every command that was set for the current active breakpoint (if there is one). 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(com) end (Pdb) Specify a list of commands for breakpoint number bpnumber. The commands themselves are entered on the following lines. Type a line containing just 'end' to terminate the commands. The commands are executed when the breakpoint is hit. To remove all commands from a breakpoint, type commands and follow it immediately with end; that is, give no commands. With no bpnumber argument, commands refers to the last breakpoint set. You can use breakpoint commands to start your program up again. Simply use the continue command, or step, or any other command that resumes execution. Specifying any command resuming execution (currently continue, step, next, return, jump, quit and their abbreviations) terminates the command list (as if that command was immediately followed by end). This is because any time you resume execution (even with a simple next or step), you may encounter another breakpoint -- which could have its own command list, leading to ambiguities about which list to execute. If you use the 'silent' command in the command list, the usual message about stopping at a breakpoint is not printed. This may be desirable for breakpoints that are to print a specific message and then continue. If none of the other commands print anything, you will see no sign that the breakpoint was reached. rz.Usage: commands [bnum] ... endNTFz(com) rrz1command definition aborted, old commands restored)lenr6rrintrrPrLrMrNr=rOrrT)r1rZbnumZold_command_defsZ prompt_backrrr do_commandssB%       zPdb.do_commandsrc CsB|s8|jr4|dtjjD]}|r||qdSd}d}d}|d}|dkrz||dd}|d|}| d}d} |dkr|d|}| |} | s| d|dS| }||dd}z t |}Wn&t k r | d|YdSXnz t |}Wnt k rzt||jj|j} Wn|} YnXz.t| d rj| j} | j} | j} | j}| j}WnD||\} }}| s| d |YYdS| } t |}YnXYnX|s|}|||}|r>|||||| }|r| |n*|||d }|d |j|j|jfdS) ab(reak) [ ([filename:]lineno | function) [, condition] ] Without argument, list all breaks. With a line number argument, set a break at this line in the current file. With a function name, set a break at the first executable line of that function. If a second argument is present, it is a string specifying an expression which must evaluate to true before the breakpoint is honored. 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It should be noted that not all jumps are allowed -- for instance it is not possible to jump into the middle of a for loop or out of a finally clause. rz)You can only jump within the bottom frameNz)The 'jump' command requires a line numberrzJump failed: %s) r\rr[rrrr]rqrw)r1rerrrdo_jump%s   z Pdb.do_jumpcCstd|jj}|j}t|j|j|j}d|j |_ | dzt |j |||fWn<tk rtdd}|tj|d YnX| dt|j|j|_dS)zdebug code Enter a recursive debugger that steps through the code argument (which is an arbitrary expression or statement to be executed in the current environment). Nz(%s) zENTERING RECURSIVE DEBUGGERrr{zLEAVING RECURSIVE DEBUGGER)r;settracer]r"rcr rQrRrSr=rjrU call_tracingr rrrr}r~Ztrace_dispatchrv)r1rrrprrrrdo_debugBs    z Pdb.do_debugcCsd|_|dS)z[q(uit) exit Quit from the debugger. The program being executed is aborted. 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N)rUpprintZpformatr/rrrrdo_ppsz Pdb.do_ppcCsfd|_d}|r|dkrz^d|krX|d\}}t|}t|}||krr||}nt|}td|d}Wqtk r|d|YdSXn0|jdks|dkrtd|jj d}n |jd}|dkr|d}|jj j }| |}zZt ||jj}|||d||||jt|t||_t||krH|d Wntk r`YnXdS) al(ist) [first [,last] | .] List source code for the current file. Without arguments, list 11 lines around the current line or continue the previous listing. With . as argument, list 11 lines around the current line. With one argument, list 11 lines starting at that line. With two arguments, list the given range; if the second argument is less than the first, it is a count. The current line in the current frame is indicated by "->". 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N)r/r&r TypeErrorrr7)r1rr$r%rrrrr do_sources z Pdb.do_sourcerc Cs|r|j}|j|d}nd}}t||D]|\}}t|d} t| dkrV| d7} ||krh| d7} n| d7} ||kr| d7} n||kr| d7} || d|q,d S) zPrint a range of lines.r{rrBz->z>> N) rqrBrrrrjustrrUr) r1r%rrrWZcurrent_linenoZ exc_linenorrsrrrr7s    zPdb._print_linescCsz||}WnYdSXd}z |j}Wntk r@YnX|rZ|d|jdSz |jj}Wntk rzYnX|r|d|jdS|jtkr|d|j|j fdS|t|dS)z;whatis arg Print the type of the argument. Nz Function %sz Method %sz Class %s.%s) r/rrrUrr __class__typerr)r1rvaluer+rrr do_whatiss.   z Pdb.do_whatiscCsl|s8|d|j|jiD]}|d|q"n0||}||j|ji|<|d||fdS)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)rUr?rr]rr setdefault)r1rrvalrrr do_display;s  zPdb.do_displaycCsT|r@z|j|ji|=WqPtk r<|d|YqPXn|j|jddS)zundisplay [expression] Do not display the expression any more in the current frame. 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