Box and Whiskers | Python Fiddle

#boxandwhisker
#it creates a box and whiskers plot of the numbers you entered

def findMedian (a) :
    length = len(a)
    if length % 2 == 0:
        #even  add the two middle numbers and divide by two
        lowerMiddle = a [length//2-1]
        upperMiddle = a [length//2]
        m = (lowerMiddle+upperMiddle)/ 2.0
        return m

else:
        m = a [length// 2]
        return m
        
# [1,2,3,4,5,6,7,8,9,10]

alist = [10,9,8,7,6,5,4,3,2,1]
print ("Your  list is unsorted.", alist)
print ("Here is your data set:" , end="")
alist.sort ()
dataSet = alist
print (dataSet)
lowerExtreme = dataSet [0]
upperExtreme = dataSet [-1]
print ("Lower Extreme:", lowerExtreme)
print ("Higher Extreme:", upperExtreme)
median = findMedian(dataSet)
print ("Median:", median)

length = len(alist)
print ("The orginal list has this many items:", length)

#even list
if length%2==0:
    lower = alist[: length//2]
    lq = findMedian(lower)
    #print ("Lower,", lower)
    upper = alist[length//2:]
    uq = findMedian (upper)
    #print ("Upper", upper)

else: 
    #odd list
    lower = alist [:length //2]
    lq = findMedian(lower)
    #print ("Lower,", lower)
    upper  = alist[length //2+1: ]
    uq = findMedian(upper)
    #print ("Upperr,", upper)
    
print ("Lower quartile:", lq )
print ("Upper quartile:", uq )

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