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Merged
merged 9 commits into from
Sep 18, 2020
Merged

Contains loops.py add #2442

merged 9 commits into from
Sep 18, 2020

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kanthuc
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@kanthuc kanthuc commented Sep 17, 2020 •
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Describe your change:

Added an algorithm which checks a linked list for loops and returns true if one is found.

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • Documentation change?

Checklist:

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized.
  • I know that pull requests will not be merged if they fail the automated tests.
  • This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
  • All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase characters with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with Python type hints.
  • All functions have doctests that pass the automated testing.
  • All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
  • If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

cclauss
cclauss requested changes Sep 17, 2020
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We need at least two doctests. One that returns True and one that returns False. We need to defined what a loop is. Is a loop just the same value twice in a row? Would 1, 2, 1, 2 be a loop?

cclauss
cclauss reviewed Sep 18, 2020
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data_structures/linked_list/contains_loop.py Outdated
@@ -13,8 +13,25 @@ def __init__(self, data: Any) -> None:

def contains_loop(root: Node) -> bool:
"""
given a node, returns true if linked list contains a loop
A linked list contains a loop when traversing through a loop, no null is reached.
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This explanation is still unclear to me. What is a null in this context?

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Hey @kanthuc,
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TravisBuddy Request Identifier: 500c6ff0-f9e9-11ea-8549-e58e00c6eb1f

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TravisBuddy Request Identifier: dde3b520-f9eb-11ea-8549-e58e00c6eb1f

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Travis tests have failed

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It'll be awesome if you fix what's wrong and commit the changes.

TravisBuddy Request Identifier: bffc4d90-f9ed-11ea-8549-e58e00c6eb1f

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Hey @kanthuc,
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TravisBuddy Request Identifier: c80f7e60-f9ef-11ea-8549-e58e00c6eb1f

@cclauss cclauss merged commit ecac7b0 into TheAlgorithms:master Sep 18, 2020
stokhos pushed a commit to stokhos/Python that referenced this pull request Jan 3, 2021
@kanthuc @cclauss @stokhos
Contains loops.py add (TheAlgorithms#2442)
5cb8760 
* added an algorithm which checks a linked list for loops and returns true if one is found

* added doctests and clarified meaning of loop

* Define Node.__iter__()

* Update and rename has_loop.py to has_duplicate_data.py

* Update has_duplicate_data.py

* Update has_duplicate_data.py

* Update and rename has_duplicate_data.py to has_loop.py

* Update has_loop.py

Co-authored-by: Christian Clauss <cclauss@me.com>
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@kanthuc @TravisBuddy @cclauss