strange error I can't figure out...

[Brian Blais]

Hello,

I have an odd kind of Heisenbug in what looks like a pretty simple program.  The 
program is a progress bar code I got at the Python Cookbook:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/168639

(including the code below)


If you uncomment the one print statement I added in the progressBar class, you get 
the error:

   File "test_progress2.py", line 19
     diffFromMin = float(self.amount - self.min)
     ^
SyntaxError: invalid syntax


yet, without the print statement, it works fine.  what am I overlooking here?


			thanks,


					bb

#------------------------------------------------------------------------

class progressBar:
	def __init__(self, minValue = 0, maxValue = 10, totalWidth=12):
		self.progBar = "[]"   # This holds the progress bar string
		self.min = minValue
		self.max = maxValue
		self.span = maxValue - minValue
		self.width = totalWidth
		self.amount = 0       # When amount == max, we are 100% done
		self.updateAmount(0)  # Build progress bar string

	def updateAmount(self, newAmount = 0):
		if newAmount < self.min: newAmount = self.min
		if newAmount > self.max: newAmount = self.max
		self.amount = newAmount

#        print "hello"   #<--------------  uncomment line to break

		# Figure out the new percent done, round to an integer
		diffFromMin = float(self.amount - self.min)
		percentDone = (diffFromMin / float(self.span)) * 100.0
		percentDone = round(percentDone)
		percentDone = int(percentDone)

		# Figure out how many hash bars the percentage should be
		allFull = self.width - 2
		numHashes = (percentDone / 100.0) * allFull
		numHashes = int(round(numHashes))

		# build a progress bar with hashes and spaces
		self.progBar = "[" + '#'*numHashes + ' '*(allFull-numHashes) + "]"

		# figure out where to put the percentage, roughly centered
		percentPlace = (len(self.progBar) / 2) - len(str(percentDone))
		percentString = str(percentDone) + "%"

		# slice the percentage into the bar
		self.progBar = self.progBar[0:percentPlace] + percentString + 
self.progBar[percentPlace+len(percentString):]

	def __str__(self):
		return str(self.progBar)


if __name__ == "__main__":

     import time
     prog = progressBar(0, 100, 77)
     for i in xrange(101):
         prog.updateAmount(i)
         print prog, "\r",
         time.sleep(.05)