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When I call this method patternFinder() I got a error like this

def patternFinder():

    while y<x:

        print reduce((lambda x,y:x+y,outcomeRange)/len(outcomeRange))
        print (currentPoint)
        print ('_________')


I get this error:

File <ipython-input-66-a32566f8689e>, line 21 print reduce((lambda x,y:x+y,outcomeRange)/len(outcomeRange)) SyntaxError: invalid syntax

That's not the correct way to use reduce (the division should be done after the reduction), and besides you don't even need to use reduce in here. If you want to calculate an average, try this instead:

print( sum(outcomeRange) / len(outcomeRange) )

By the way, beware of integer division. Make sure that outcomeRange contains at least one decimal value, or that you imported the current division function:

from __future__ import division

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reduce takes two separate arguments, function and iterable. So, you line should be

reduce(lambda x,y:x+y,  outcomeRange/len(outcomeRange))

However, also make sure that your outcomeRange is a numpy array, otherwise you'll get another syntax error for trying to divide it by a number. Otherwise, convert the division to [x/len(outcomeRange) for x in outcomeRange]

In that case, it would be better to divide by the lenght after the summation is done, so, you could write

reduce(lambda x, y: x+y, outcomeRange) / len(outcomeRange)

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You are most likely using Python 3+, which means that the syntax of your print statement is incorrect. It needs to be in parentheses:

print(reduce((lambda x,y:x+y,outcomeRange)/len(outcomeRange)))

You've done it correctly in the other 2 print statements, I guess you've just missed it here.

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  • You are using Python 2 syntax with Python 3 if I had to guess. Also you are dividing inside the reduce and not outside.
  • which python version are you using? Python 3 or Python 2? if python 3, the print statement needs parenthesis
  • Pretty sure the division needs to be out of the reduce if anything.
  • @kabanus: it not part of the reduce, it's part of the expression producing the iterable.
  • I think OP is calculating an average, besides, if outcomeRange is not a numpy array that division is a syntax error.
  • @kabanus: I have already written that it's a syntax error if it's not numpy, and provided alternative syntax
  • @kabanus: the OP has mixed mixed up parentheses, so it's impossible to know what the exact order of the operations should be.