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snippets/python/s/bifurcate.md

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+---
+title: Bifurcate list based on values
+type: snippet
+language: python
+tags: [list]
+cover: mug-flower-book
+dateModified: 2020-11-02T19:27:07+02:00
+---
+
+Splits values into two groups, based on the result of the given `filter` list.
+
+- Use a list comprehension and `zip()` to add elements to groups, based on `filter`.
+- If `filter` has a truthy value for any element, add it to the first group, otherwise add it to the second group.
+
+```py
+def bifurcate(lst, filter):
+  return [
+    [x for x, flag in zip(lst, filter) if flag],
+    [x for x, flag in zip(lst, filter) if not flag]
+  ]
+```
+
+```py
+bifurcate(['beep', 'boop', 'foo', 'bar'], [True, True, False, True])
+# [ ['beep', 'boop', 'bar'], ['foo'] ]
+```