'Handler for call events.
If the code block being entered is to be ignored, returns `None\',
else returns self.localtrace.'

def globaltrace_lt(self, frame, why, arg):

    if (why == 'call'):
        code = frame.f_code
        filename = frame.f_globals.get('__file__', None)
        if filename:
            modulename = modname(filename)
            if (modulename is not None):
                ignore_it = self.ignore.names(filename, modulename)
                if (not ignore_it):
                    if self.trace:
                        print ('    ---    modulename:    %s,    funcname:    %s' % (modulename, code.co_name))
                    return self.localtrace
        else:
            return None
