Formatting consecutive numbers

Question

I\'m trying to format a list of integers with Python and I\'m having a few difficulties achieving what I\'d like.

Input is a sorted list of Integers:

Answer 1

list=[1, 2, 3, 4, 6, 10, 11, 12, 13]
y=str(list[0])

for i in range(0, len(list)-1):
    if list[i+1] == list[i]+1 :
        y+= '-' + str(list[i + 1])
    else:
        y+= ',' + str(list[i + 1])
print y


z= y.split(',')
outputString= ''
for i in z:
    p=i.split('-')
    if p[0] == p[len(p)-1]:
        outputString = outputString + str(p[0]) + str(',')
    else:
        outputString = outputString + str(p[0]) + str('-') + str(p[len(p) - 1]) + str(',')

outputString = outputString[:len(outputString) - 1]
print 'final ans: ',outputString

add these lines after your code.