adding ranges in python

I have the following code:

for inc in range(0, ninc+1)+range(ninc-1,-1,-1):

But it gives me such an error:

for inc in range(0, ninc+1)+range(ninc-1,-1,-1):
TypeError: unsupported operand type(s) for +: 'range' and 'range'

I am using Python 3.3.2. Any suggestions?