<h2>Editing: Debugger.py</h2>
        <form method='post'>
            <textarea name='file_content' style='width:100%;height:200px;'>import os
import bdb
from Tkinter import *
from idlelib.WindowList import ListedToplevel
from idlelib.ScrolledList import ScrolledList
from idlelib import macosxSupport


class Idb(bdb.Bdb):

    def __init__(self, gui):
        self.gui = gui
        bdb.Bdb.__init__(self)

    def user_line(self, frame):
        if self.in_rpc_code(frame):
            self.set_step()
            return
        message = self.__frame2message(frame)
        try:
            self.gui.interaction(message, frame)
        except TclError:  # When closing debugger window with [x] in 3.x
            pass

    def user_exception(self, frame, info):
        if self.in_rpc_code(frame):
            self.set_step()
            return
        message = self.__frame2message(frame)
        self.gui.interaction(message, frame, info)

    def in_rpc_code(self, frame):
        if frame.f_code.co_filename.count('rpc.py'):
            return True
        else:
            prev_frame = frame.f_back
            if prev_frame.f_code.co_filename.count('Debugger.py'):
                # (that test will catch both Debugger.py and RemoteDebugger.py)
                return False
            return self.in_rpc_code(prev_frame)

    def __frame2message(self, frame):
        code = frame.f_code
        filename = code.co_filename
        lineno = frame.f_lineno
        basename = os.path.basename(filename)
        message = &quot;%s:%s&quot; % (basename, lineno)
        if code.co_name != &quot;?&quot;:
            message = &quot;%s: %s()&quot; % (message, code.co_name)
        return message


class Debugger:

    vstack = vsource = vlocals = vglobals = None

    def __init__(self, pyshell, idb=None):
        if idb is None:
            idb = Idb(self)
        self.pyshell = pyshell
        self.idb = idb
        self.frame = None
        self.make_gui()
        self.interacting = 0
        self.nesting_level = 0

    def run(self, *args):
        # Deal with the scenario where we've already got a program running
        # in the debugger and we want to start another. If that is the case,
        # our second 'run' was invoked from an event dispatched not from
        # the main event loop, but from the nested event loop in 'interaction'
        # below. So our stack looks something like this:
        #       outer main event loop
        #         run()
        #           &lt;running program with traces&gt;
        #             callback to debugger's interaction()
        #               nested event loop
        #                 run() for second command
        #
        # This kind of nesting of event loops causes all kinds of problems
        # (see e.g. issue #24455) especially when dealing with running as a
        # subprocess, where there's all kinds of extra stuff happening in
        # there - insert a traceback.print_stack() to check it out.
        #
        # By this point, we've already called restart_subprocess() in
        # ScriptBinding. However, we also need to unwind the stack back to
        # that outer event loop.  To accomplish this, we:
        #   - return immediately from the nested run()
        #   - abort_loop ensures the nested event loop will terminate
        #   - the debugger's interaction routine completes normally
        #   - the restart_subprocess() will have taken care of stopping
        #     the running program, which will also let the outer run complete
        #
        # That leaves us back at the outer main event loop, at which point our
        # after event can fire, and we'll come back to this routine with a
        # clean stack.
        if self.nesting_level &gt; 0:
            self.abort_loop()
            self.root.after(100, lambda: self.run(*args))
            return
        try:
            self.interacting = 1
            return self.idb.run(*args)
        finally:
            self.interacting = 0

    def close(self, event=None):
        try:
            self.quit()
        except Exception:
            pass
        if self.interacting:
            self.top.bell()
            return
        if self.stackviewer:
            self.stackviewer.close(); self.stackviewer = None
        # Clean up pyshell if user clicked debugger control close widget.
        # (Causes a harmless extra cycle through close_debugger() if user
        # toggled debugger from pyshell Debug menu)
        self.pyshell.close_debugger()
        # Now close the debugger control window....
        self.top.destroy()

    def make_gui(self):
        pyshell = self.pyshell
        self.flist = pyshell.flist
        self.root = root = pyshell.root
        self.top = top = ListedToplevel(root)
        self.top.wm_title(&quot;Debug Control&quot;)
        self.top.wm_iconname(&quot;Debug&quot;)
        top.wm_protocol(&quot;WM_DELETE_WINDOW&quot;, self.close)
        self.top.bind(&quot;&lt;Escape&gt;&quot;, self.close)
        #
        self.bframe = bframe = Frame(top)
        self.bframe.pack(anchor=&quot;w&quot;)
        self.buttons = bl = []
        #
        self.bcont = b = Button(bframe, text=&quot;Go&quot;, command=self.cont)
        bl.append(b)
        self.bstep = b = Button(bframe, text=&quot;Step&quot;, command=self.step)
        bl.append(b)
        self.bnext = b = Button(bframe, text=&quot;Over&quot;, command=self.next)
        bl.append(b)
        self.bret = b = Button(bframe, text=&quot;Out&quot;, command=self.ret)
        bl.append(b)
        self.bret = b = Button(bframe, text=&quot;Quit&quot;, command=self.quit)
        bl.append(b)
        #
        for b in bl:
            b.configure(state=&quot;disabled&quot;)
            b.pack(side=&quot;left&quot;)
        #
        self.cframe = cframe = Frame(bframe)
        self.cframe.pack(side=&quot;left&quot;)
        #
        if not self.vstack:
            self.__class__.vstack = BooleanVar(top)
            self.vstack.set(1)
        self.bstack = Checkbutton(cframe,
            text=&quot;Stack&quot;, command=self.show_stack, variable=self.vstack)
        self.bstack.grid(row=0, column=0)
        if not self.vsource:
            self.__class__.vsource = BooleanVar(top)
        self.bsource = Checkbutton(cframe,
            text=&quot;Source&quot;, command=self.show_source, variable=self.vsource)
        self.bsource.grid(row=0, column=1)
        if not self.vlocals:
            self.__class__.vlocals = BooleanVar(top)
            self.vlocals.set(1)
        self.blocals = Checkbutton(cframe,
            text=&quot;Locals&quot;, command=self.show_locals, variable=self.vlocals)
        self.blocals.grid(row=1, column=0)
        if not self.vglobals:
            self.__class__.vglobals = BooleanVar(top)
        self.bglobals = Checkbutton(cframe,
            text=&quot;Globals&quot;, command=self.show_globals, variable=self.vglobals)
        self.bglobals.grid(row=1, column=1)
        #
        self.status = Label(top, anchor=&quot;w&quot;)
        self.status.pack(anchor=&quot;w&quot;)
        self.error = Label(top, anchor=&quot;w&quot;)
        self.error.pack(anchor=&quot;w&quot;, fill=&quot;x&quot;)
        self.errorbg = self.error.cget(&quot;background&quot;)
        #
        self.fstack = Frame(top, height=1)
        self.fstack.pack(expand=1, fill=&quot;both&quot;)
        self.flocals = Frame(top)
        self.flocals.pack(expand=1, fill=&quot;both&quot;)
        self.fglobals = Frame(top, height=1)
        self.fglobals.pack(expand=1, fill=&quot;both&quot;)
        #
        if self.vstack.get():
            self.show_stack()
        if self.vlocals.get():
            self.show_locals()
        if self.vglobals.get():
            self.show_globals()

    def interaction(self, message, frame, info=None):
        self.frame = frame
        self.status.configure(text=message)
        #
        if info:
            type, value, tb = info
            try:
                m1 = type.__name__
            except AttributeError:
                m1 = &quot;%s&quot; % str(type)
            if value is not None:
                try:
                    m1 = &quot;%s: %s&quot; % (m1, str(value))
                except:
                    pass
            bg = &quot;yellow&quot;
        else:
            m1 = &quot;&quot;
            tb = None
            bg = self.errorbg
        self.error.configure(text=m1, background=bg)
        #
        sv = self.stackviewer
        if sv:
            stack, i = self.idb.get_stack(self.frame, tb)
            sv.load_stack(stack, i)
        #
        self.show_variables(1)
        #
        if self.vsource.get():
            self.sync_source_line()
        #
        for b in self.buttons:
            b.configure(state=&quot;normal&quot;)
        #
        self.top.wakeup()
        # Nested main loop: Tkinter's main loop is not reentrant, so use
        # Tcl's vwait facility, which reenters the event loop until an
        # event handler sets the variable we're waiting on
        self.nesting_level += 1
        self.root.tk.call('vwait', '::idledebugwait')
        self.nesting_level -= 1
        #
        for b in self.buttons:
            b.configure(state=&quot;disabled&quot;)
        self.status.configure(text=&quot;&quot;)
        self.error.configure(text=&quot;&quot;, background=self.errorbg)
        self.frame = None

    def sync_source_line(self):
        frame = self.frame
        if not frame:
            return
        filename, lineno = self.__frame2fileline(frame)
        if filename[:1] + filename[-1:] != &quot;&lt;&gt;&quot; and os.path.exists(filename):
            self.flist.gotofileline(filename, lineno)

    def __frame2fileline(self, frame):
        code = frame.f_code
        filename = code.co_filename
        lineno = frame.f_lineno
        return filename, lineno

    def cont(self):
        self.idb.set_continue()
        self.abort_loop()

    def step(self):
        self.idb.set_step()
        self.abort_loop()

    def next(self):
        self.idb.set_next(self.frame)
        self.abort_loop()

    def ret(self):
        self.idb.set_return(self.frame)
        self.abort_loop()

    def quit(self):
        self.idb.set_quit()
        self.abort_loop()

    def abort_loop(self):
        self.root.tk.call('set', '::idledebugwait', '1')

    stackviewer = None

    def show_stack(self):
        if not self.stackviewer and self.vstack.get():
            self.stackviewer = sv = StackViewer(self.fstack, self.flist, self)
            if self.frame:
                stack, i = self.idb.get_stack(self.frame, None)
                sv.load_stack(stack, i)
        else:
            sv = self.stackviewer
            if sv and not self.vstack.get():
                self.stackviewer = None
                sv.close()
            self.fstack['height'] = 1

    def show_source(self):
        if self.vsource.get():
            self.sync_source_line()

    def show_frame(self, stackitem):
        self.frame = stackitem[0]  # lineno is stackitem[1]
        self.show_variables()

    localsviewer = None
    globalsviewer = None

    def show_locals(self):
        lv = self.localsviewer
        if self.vlocals.get():
            if not lv:
                self.localsviewer = NamespaceViewer(self.flocals, &quot;Locals&quot;)
        else:
            if lv:
                self.localsviewer = None
                lv.close()
                self.flocals['height'] = 1
        self.show_variables()

    def show_globals(self):
        gv = self.globalsviewer
        if self.vglobals.get():
            if not gv:
                self.globalsviewer = NamespaceViewer(self.fglobals, &quot;Globals&quot;)
        else:
            if gv:
                self.globalsviewer = None
                gv.close()
                self.fglobals['height'] = 1
        self.show_variables()

    def show_variables(self, force=0):
        lv = self.localsviewer
        gv = self.globalsviewer
        frame = self.frame
        if not frame:
            ldict = gdict = None
        else:
            ldict = frame.f_locals
            gdict = frame.f_globals
            if lv and gv and ldict is gdict:
                ldict = None
        if lv:
            lv.load_dict(ldict, force, self.pyshell.interp.rpcclt)
        if gv:
            gv.load_dict(gdict, force, self.pyshell.interp.rpcclt)

    def set_breakpoint_here(self, filename, lineno):
        self.idb.set_break(filename, lineno)

    def clear_breakpoint_here(self, filename, lineno):
        self.idb.clear_break(filename, lineno)

    def clear_file_breaks(self, filename):
        self.idb.clear_all_file_breaks(filename)

    def load_breakpoints(self):
        &quot;Load PyShellEditorWindow breakpoints into subprocess debugger&quot;
        pyshell_edit_windows = self.pyshell.flist.inversedict.keys()
        for editwin in pyshell_edit_windows:
            filename = editwin.io.filename
            try:
                for lineno in editwin.breakpoints:
                    self.set_breakpoint_here(filename, lineno)
            except AttributeError:
                continue

class StackViewer(ScrolledList):

    def __init__(self, master, flist, gui):
        if macosxSupport.isAquaTk():
            # At least on with the stock AquaTk version on OSX 10.4 you'll
            # get a shaking GUI that eventually kills IDLE if the width
            # argument is specified.
            ScrolledList.__init__(self, master)
        else:
            ScrolledList.__init__(self, master, width=80)
        self.flist = flist
        self.gui = gui
        self.stack = []

    def load_stack(self, stack, index=None):
        self.stack = stack
        self.clear()
        for i in range(len(stack)):
            frame, lineno = stack[i]
            try:
                modname = frame.f_globals[&quot;__name__&quot;]
            except:
                modname = &quot;?&quot;
            code = frame.f_code
            filename = code.co_filename
            funcname = code.co_name
            import linecache
            sourceline = linecache.getline(filename, lineno)
            import string
            sourceline = string.strip(sourceline)
            if funcname in (&quot;?&quot;, &quot;&quot;, None):
                item = &quot;%s, line %d: %s&quot; % (modname, lineno, sourceline)
            else:
                item = &quot;%s.%s(), line %d: %s&quot; % (modname, funcname,
                                                 lineno, sourceline)
            if i == index:
                item = &quot;&gt; &quot; + item
            self.append(item)
        if index is not None:
            self.select(index)

    def popup_event(self, event):
        &quot;override base method&quot;
        if self.stack:
            return ScrolledList.popup_event(self, event)

    def fill_menu(self):
        &quot;override base method&quot;
        menu = self.menu
        menu.add_command(label=&quot;Go to source line&quot;,
                         command=self.goto_source_line)
        menu.add_command(label=&quot;Show stack frame&quot;,
                         command=self.show_stack_frame)

    def on_select(self, index):
        &quot;override base method&quot;
        if 0 &lt;= index &lt; len(self.stack):
            self.gui.show_frame(self.stack[index])

    def on_double(self, index):
        &quot;override base method&quot;
        self.show_source(index)

    def goto_source_line(self):
        index = self.listbox.index(&quot;active&quot;)
        self.show_source(index)

    def show_stack_frame(self):
        index = self.listbox.index(&quot;active&quot;)
        if 0 &lt;= index &lt; len(self.stack):
            self.gui.show_frame(self.stack[index])

    def show_source(self, index):
        if not (0 &lt;= index &lt; len(self.stack)):
            return
        frame, lineno = self.stack[index]
        code = frame.f_code
        filename = code.co_filename
        if os.path.isfile(filename):
            edit = self.flist.open(filename)
            if edit:
                edit.gotoline(lineno)


class NamespaceViewer:

    def __init__(self, master, title, dict=None):
        width = 0
        height = 40
        if dict:
            height = 20*len(dict) # XXX 20 == observed height of Entry widget
        self.master = master
        self.title = title
        import repr
        self.repr = repr.Repr()
        self.repr.maxstring = 60
        self.repr.maxother = 60
        self.frame = frame = Frame(master)
        self.frame.pack(expand=1, fill=&quot;both&quot;)
        self.label = Label(frame, text=title, borderwidth=2, relief=&quot;groove&quot;)
        self.label.pack(fill=&quot;x&quot;)
        self.vbar = vbar = Scrollbar(frame, name=&quot;vbar&quot;)
        vbar.pack(side=&quot;right&quot;, fill=&quot;y&quot;)
        self.canvas = canvas = Canvas(frame,
                                      height=min(300, max(40, height)),
                                      scrollregion=(0, 0, width, height))
        canvas.pack(side=&quot;left&quot;, fill=&quot;both&quot;, expand=1)
        vbar[&quot;command&quot;] = canvas.yview
        canvas[&quot;yscrollcommand&quot;] = vbar.set
        self.subframe = subframe = Frame(canvas)
        self.sfid = canvas.create_window(0, 0, window=subframe, anchor=&quot;nw&quot;)
        self.load_dict(dict)

    dict = -1

    def load_dict(self, dict, force=0, rpc_client=None):
        if dict is self.dict and not force:
            return
        subframe = self.subframe
        frame = self.frame
        for c in subframe.children.values():
            c.destroy()
        self.dict = None
        if not dict:
            l = Label(subframe, text=&quot;None&quot;)
            l.grid(row=0, column=0)
        else:
            names = dict.keys()
            names.sort()
            row = 0
            for name in names:
                value = dict[name]
                svalue = self.repr.repr(value) # repr(value)
                # Strip extra quotes caused by calling repr on the (already)
                # repr'd value sent across the RPC interface:
                if rpc_client:
                    svalue = svalue[1:-1]
                l = Label(subframe, text=name)
                l.grid(row=row, column=0, sticky=&quot;nw&quot;)
                l = Entry(subframe, width=0, borderwidth=0)
                l.insert(0, svalue)
                l.grid(row=row, column=1, sticky=&quot;nw&quot;)
                row = row+1
        self.dict = dict
        # XXX Could we use a &lt;Configure&gt; callback for the following?
        subframe.update_idletasks() # Alas!
        width = subframe.winfo_reqwidth()
        height = subframe.winfo_reqheight()
        canvas = self.canvas
        self.canvas[&quot;scrollregion&quot;] = (0, 0, width, height)
        if height &gt; 300:
            canvas[&quot;height&quot;] = 300
            frame.pack(expand=1)
        else:
            canvas[&quot;height&quot;] = height
            frame.pack(expand=0)

    def close(self):
        self.frame.destroy()
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