Remove parantheses inside tuple

Question

I have a list of tuples:

listoftuples = [(('elementone', 'elementtwo'), 'elementthree')(....

Now I want to output this list as:

listoftuples = [('elementone', 'elementtwo', 'elementthree')(....

How can i remove those extra parantheses? I have tried to strip them put that doesn't work.

Don't think of it as removing parentheses; you aren't manipulating a string. — chepner, Nov 29 '17 at 15:02
it's unclear what your objects are. Your syntax is incorrect `'elementthree')(....` — Jean-François Fabre, Nov 29 '17 at 15:04
or that one: https://stackoverflow.com/questions/47431752/how-to-flatten-a-list-of-nested-tuples-in-python. It's so unclear putting all 3 dupe links will do — Jean-François Fabre, Nov 29 '17 at 15:06

score 1 · Answer 1 · answered Nov 29 '17 at 15:02

If the depth is 2, then you can use itertools:

import itertools
listoftuples = [(('elementone', 'elementtwo'), 'elementthree')]
final_list = [tuple(itertools.chain.from_iterable([i] if not isinstance(i, tuple) else i for i in b)) for b in listoftuples]

Output:

[('elementone', 'elementtwo', 'elementthree')]

However, with arbitrary depth, it is best to use recursion:

def flatten(s):
   if not isinstance(s, tuple):
      yield s
   else:
      for b in s:
          for i in flatten(b):
              yield i


listoftuples = [(('elementone', 'elementtwo'), 'elementthree')]
final_list = map(tuple, map(flatten, listoftuples))

Output:

[('elementone', 'elementtwo', 'elementthree')]

Remove parantheses inside tuple

1 Answers1