python类call_tracing()的实例源码

def do_debug(self, arg):
        sys.settrace(None)
        globals = self.curframe.f_globals
        locals = self.curframe_locals
        p = Pdb(self.completekey, self.stdin, self.stdout)
        p.prompt = "(%s) " % self.prompt.strip()
        print >>self.stdout, "ENTERING RECURSIVE DEBUGGER"
        sys.call_tracing(p.run, (arg, globals, locals))
        print >>self.stdout, "LEAVING RECURSIVE DEBUGGER"
        sys.settrace(self.trace_dispatch)
        self.lastcmd = p.lastcmd

def context_dispatcher(self, old, new):
        self.stepping = STEPPING_NONE
        # for those tasklets that started before we started tracing
        # we need to make sure that the trace is set by patching
        # it in the context switch
        if old and new:
            if hasattr(new.frame, "f_trace") and not new.frame.f_trace:
                sys.call_tracing(new.settrace,(self.trace_func,))

def context_dispatcher(self, old, new):
        self.stepping = STEPPING_NONE
        # for those tasklets that started before we started tracing
        # we need to make sure that the trace is set by patching
        # it in the context switch
        if old and new:
            if hasattr(new.frame, "f_trace") and not new.frame.f_trace:
                sys.call_tracing(new.settrace,(self.trace_func,))