LinuxCNC pyton debugging with pycharm

linuxcnc-vm@linuxcnc:~/linuxcnc-dev$ . scripts/rip-environment
linuxcnc-vm@linuxcnc:~/linuxcnc-dev$ linuxcnc

import sys
import linuxcnc
try:
    s = linuxcnc.stat() # create a connection to the status channel
    s.poll() # get current values
except linuxcnc.error, detail:
    print "error", detail
    sys.exit(1)
for x in dir(s):
    if not x.startswith('_'):
        print x, getattr(s,x)

# Down
    def on_down_released(self, gtkbutton, data = None):
        self.command.mode( linuxcnc.MODE_MDI )
        self.command.wait_complete()
        # Start down.ngc
        if self.ocode ("O<down> call") == -1:
            return
        a=self.probed_position_with_offsets()
        self.lb_probe_z.set_text( "%.4f" % float(a[2]) )
        self.add_history(gtkbutton.get_tooltip_text(),"Z",0,0,0,0,0,0,0,0,a[2],0,0)
        self.set_zerro("Z",0,0,a[2])

import pudb
pudb.set_trace() # at the position you want to break