Du Yuanchao 44b8cb0c81
Updated Stack (#2414)
* * Added type hints
* Added test
* Formated code

* updating DIRECTORY.md

* Update stack.py

* Test error conditions for pop, peek, and

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>
2020-09-13 13:56:03 +02:00
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2019-10-05 10:14:13 +05:00
2019-12-26 19:50:12 +08:00
2020-09-13 13:56:03 +02:00