Possible Duplicate:
Making a flat list out of list of lists in Python
I am trying to find an easy way to turn a multi dimensional (nested) python list into a single list, that contains all the elements of sub lists.
For example:
A = [[1,2,3,4,5]]
turns to
A = [1,2,3,4,5]
or
A = [[1,2], [3,4]]
turns to
A = [1,2,3,4]