Hi,

The following code (BLOCK 1) is intended to simulate a television by creating it as an object, and is it stands I am pretty happy with it. Having created a volume control however, I then wanted to add a brightness and contrast control. My first attempt at doing this involved adding a contrast_adjust() method, and a brightness_adjust() method. This entailed copying the volume_adjust() method and substituting the word "volume" with "contrast" or "brightness" wherever needed. As you can imagine however this led to a lot of duplication, so I set about creating a single adjust() method which could be used to adjust all 3 controls (see BLOCK 3 for how I tried to do this). Unfortunately this doesn't work - python won't let me pass a value (e.g. "volume") to the adjust method and then let this value be used as the PROPERTY attribute (if you see what I mean). Can anyone see a way around this?

CODE BLOCK 1.

# Creating a television
class Television(object):
	"""A virtual televsion"""
	def __init__(self, volume = 20, channel = 1):
		self.volume = volume
		self.channel = channel
	
	def change_channel(self, number):
		if number > 5:
			print "Channel not available"
		else:	
			self.channel = number
			print "You are now watching channel", self.channel
	
	def volume_adjust(self):
		print "-\tVolume (", self.volume, ")\t   +"
		adjust = raw_input("")
		while adjust == "+" or adjust == "-":

			if adjust == "+":
				self.volume += 1
			else:
				self.volume -= 1
			
			if self.volume < 0:
				self.volume = 0
			elif self.volume > 20:
				self.volume = 20
			else:
				pass

			print "-\tVolume (", self.volume, ")\t   +"
			adjust = raw_input("")
		



def remote():

	print """
		  _____________
		|                 |
		|    1 2 3     |
		|    4 5 6     |
		|    7 8 9     |
		|                |
		| |V|olume     |
		| |C|ontrast    |
		| |B|rightness |
		|                    |
		|    +   -          |
		|              |
		 --------------
		"""



def main():
	
	tele = Television()
	remote()	
	remote_control = raw_input("Make your choice: ")
	
	while remote_control != "x":
	
		try:
			if int(remote_control) in range(1, 101):
				tele.change_channel(int(remote_control))
	
		except(ValueError):
			if (remote_control) == "v":
				tele.volume_adjust()
			else:
				pass
		
		remote()
		remote_control = raw_input("Make your choice: ")

	print "Television now on standby."

main()

CODE BLOCK 2:


CODE BLOCK 3:

class Television(object):
	"""A virtual televsion"""
	def __init__(self, volume = 20, brightness = 20, contrast = 20, channel = 1):
		self.volume = volume
		self.channel = channel
		self.brightness = brightness
		self.contrast = contrast
	
	def change_channel(self, number):
		if number > 5:
			print "Channel not available"
		else:	
			self.channel = number
			print "You are now watching channel", self.channel
	
	def vol(self):
		print "-\tVolume (", self.volume, ")\t   +"
		self.adjust("volume")
	
	def bright(self):
		print "-\tBrightness (", self.brightness, ")\t   +"
		self.adjust("brightness")
	
	def contr(self):
		print "-\tContrast (", self.contrast, ")\t   +"
		self.adjust("Contrast")		

	
	def adjust(self, PROPERTY):
		print self.PROPERTY
		adjust = raw_input("")
		while adjust == "+" or adjust == "-":

			if adjust == "+":
				self.PROPERTY += 1
			else:
				self.PROPERTY -= 1
			
			if self.PROPERTY < 0:
				self.PROPERTY = 0
			elif self.PROPERTY > 20:
				self.PROPERTY = 20
			else:
				pass

			print "-\t", PROPERTY, self.PROPERTY, ")\t   +"
			adjust = raw_input("")

How about having a dictionary containing volume, brightness, and contrast?

def adjust(self, PROPERTY):
		print self.stats[PROPERTY]
		adjust = raw_input("")
		while adjust == "+" or adjust == "-":
 
			if adjust == "+":
				self.stats[PROPERTY] += 1
			else:
				self.stats[PROPERTY] -= 1
 
			if self.stats[PROPERTY] < 0:
				self.stats[PROPERTY] = 0
			elif self.stats[PROPERTY] > 20:
				self.stats[PROPERTY] = 20
			else:
				pass
 
			print "-\t", PROPERTY, self.stats[PROPERTY], ")\t   +"
			adjust = raw_input("")

I'm pretty sure you'll get it from here. You can also as as many other statuses to the TV as you want this way, and have almost no extra code.

Edited 7 Years Ago by Mathhax0r: Forgot to include a bit of code.

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