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Python calling method in class

  • Thread starter Thread starter kirgy
  • Start date Start date
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kirgy

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I'm trying to call a method in a class. I don't know what 'self' refers to, and what is the correct procedure to call such a method inside a class and outside a class.

Could someone explain how to call the move method with the variable RIGHT?

The following class works in Scott's Python script which is accessed by a terminal GUI (urwid).

The function I'm working with is a Scott Weston's missile launcher Python script, which I'm trying to hook into a PHP web-server.

Code:
class MissileDevice:
  INITA     = (85, 83, 66, 67,  0,  0,  4,  0)
  INITB     = (85, 83, 66, 67,  0, 64,  2,  0)
  CMDFILL   = ( 8,  8,
                0,  0,  0,  0,  0,  0,  0,  0,
                0,  0,  0,  0,  0,  0,  0,  0,
                0,  0,  0,  0,  0,  0,  0,  0,
                0,  0,  0,  0,  0,  0,  0,  0,
                0,  0,  0,  0,  0,  0,  0,  0,
                0,  0,  0,  0,  0,  0,  0,  0,
                0,  0,  0,  0,  0,  0,  0,  0)
  STOP      = ( 0,  0,  0,  0,  0,  0)
  LEFT      = ( 0,  1,  0,  0,  0,  0)
  RIGHT     = ( 0,  0,  1,  0,  0,  0)
  UP        = ( 0,  0,  0,  1,  0,  0)
  DOWN      = ( 0,  0,  0,  0,  1,  0)
  LEFTUP    = ( 0,  1,  0,  1,  0,  0)
  RIGHTUP   = ( 0,  0,  1,  1,  0,  0)
  LEFTDOWN  = ( 0,  1,  0,  0,  1,  0)
  RIGHTDOWN = ( 0,  0,  1,  0,  1,  0)
  FIRE      = ( 0,  0,  0,  0,  0,  1)

  def __init__(self, battery):
    try:
      self.dev=UsbDevice(0x1130, 0x0202, battery)
      self.dev.open()
      self.dev.handle.reset()
    except NoMissilesError, e:
      raise NoMissilesError()

  def move(self, direction):
    self.dev.handle.controlMsg(0x21, 0x09, self.INITA, 0x02, 0x01)
    self.dev.handle.controlMsg(0x21, 0x09, self.INITB, 0x02, 0x01)
    self.dev.handle.controlMsg(0x21, 0x09, direction+self.CMDFILL, 0x02, 0x01)
<p>I'm trying to call a method in a class. I don't know what 'self' refers to, and what is the correct procedure to call such a method inside a class and outside a class.</p>
<p>Could someone explain how to call the <code>move</code> method with the variable <code>RIGHT</code>?</p>
<p>The following class works in Scott's Python script which is accessed by a terminal GUI (urwid).</p>
<p>The function I'm working with is a Scott Weston's missile launcher Python script, which I'm trying to hook into a PHP web-server.</p>
<pre><code>class MissileDevice:
INITA = (85, 83, 66, 67, 0, 0, 4, 0)
INITB = (85, 83, 66, 67, 0, 64, 2, 0)
CMDFILL = ( 8, 8,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0)
STOP = ( 0, 0, 0, 0, 0, 0)
LEFT = ( 0, 1, 0, 0, 0, 0)
RIGHT = ( 0, 0, 1, 0, 0, 0)
UP = ( 0, 0, 0, 1, 0, 0)
DOWN = ( 0, 0, 0, 0, 1, 0)
LEFTUP = ( 0, 1, 0, 1, 0, 0)
RIGHTUP = ( 0, 0, 1, 1, 0, 0)
LEFTDOWN = ( 0, 1, 0, 0, 1, 0)
RIGHTDOWN = ( 0, 0, 1, 0, 1, 0)
FIRE = ( 0, 0, 0, 0, 0, 1)

def __init__(self, battery):
try:
self.dev=UsbDevice(0x1130, 0x0202, battery)
self.dev.open()
self.dev.handle.reset()
except NoMissilesError, e:
raise NoMissilesError()

def move(self, direction):
self.dev.handle.controlMsg(0x21, 0x09, self.INITA, 0x02, 0x01)
self.dev.handle.controlMsg(0x21, 0x09, self.INITB, 0x02, 0x01)
self.dev.handle.controlMsg(0x21, 0x09, direction+self.CMDFILL, 0x02, 0x01)
</code></pre>
 

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