The repository contains a collection of different programming snippets to different programming languages from own developments as well as other projects
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programming-examples/python/Tuple/Python program to convert a...

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#create a list
l = [("x", 1), ("x", 2), ("x", 3), ("y", 1), ("y", 2), ("z", 1)]
d = {}
for a, b in l:
d.setdefault(a, []).append(b)
print (d)