How to get list from set of coordinates?

Question

How to flatten the coordinates?

For input  :[(1,2),(5,6),(7,8)]

expecting the output as [1,2,5,6,7,8]

Answer 1

Try it like this:

mylist = [(1,2),(5,6),(7,8)]
newlist = []
for x in mylist:
  newlist += x
 
print(newlist)

Answer 2

from the itertools doc page

from itertools import chain
def flatten(listOfLists):
    "Flatten one level of nesting"
    return chain.from_iterable(listOfLists)