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snippets/python/s/powerset.md

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+---
+title: Powerset
+type: snippet
+language: python
+tags: [math,list]
+author: chalarangelo
+cover: rock-climbing
+dateModified: 2020-11-02T19:28:27+02:00
+---
+
+Returns the powerset of a given iterable.
+
+- Use `list()` to convert the given value to a list.
+- Use `range()` and `itertools.combinations()` to create a generator that returns all subsets.
+- Use `itertools.chain.from_iterable()` and `list()` to consume the generator and return a list.
+
+```py
+from itertools import chain, combinations
+
+def powerset(iterable):
+  s = list(iterable)
+  return list(chain.from_iterable(combinations(s, r) for r in range(len(s)+1)))
+```
+
+```py
+powerset([1, 2]) # [(), (1,), (2,), (1, 2)]
+```