* Rewritten reddit.py

* Removed logging module import

* Fixed minor bug which was causing extreme rate limiting

* Update reddit.py

* Update reddit.py

* Update reddit.py
Co-authored-by: NChristian Clauss <cclauss@me.com>

* Add all_construct dynamic programming implementation

* all_construct: remove the main function

* all_construct: Add type hints

* all_construct: changed map to list comprehension,fix mutable default arguments

* all_construct: fixed type hints

* all_construct: cleaner code for initializing word_bank argument

* all_construct: added an import for annotations

* all_construct: added None in the argument with word_bank

* all_construct: fixed a type hint

* all_construct: Fixed some more type hints

* Added 5 README files

* corrected arithmetic_analysis README

* Update audio_filters/README.md
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Update backtracking/README.md
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Update bit_manipulation/README.md
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Fix type annotations in lowest_common_ancestor.py

* Refactor line 53 in lowest_common_ancestor.py

+ As per usage examples, clause literals are a list of strings.
  + Note: symbols extracted from literals are expected to be exactly two characters.
+ self.literal boolean values are initialized to None, so must be optional
+ model values should be Booleans, but aren't guaranteed to be non-None
  in the code.
+ uses newer '... | None' annotation for Optional values
+ clauses are passed to the Formula initializer as both lists and sets, they
  are stored as lists.  Returned clauses will always be lists.
+ use explicit tuple annotation from __future__  rather than using (..., ...)
  in return signatures
+ mapping returned by dpll_algorithm is optional per the documentation.

* Improve solution

* updating DIRECTORY.md
Co-authored-by: Ngithub-actions <${GITHUB_ACTOR}@users.noreply.github.com>

* Python file for finding number of pairs

* updating DIRECTORY.md

* fixed iterative_pair.py

* further fixed with type casting

* fixed naming conventions

* further fixed with naming convention

* documented done

* build issue fixed

* updating DIRECTORY.md

* Revert "documented done"

This reverts commit 3be15ca374f3ea3f01f725912dba59b939b058b5.

* Update canny.py

* Update test_digital_image_processing.py

* Update sobel_filter.py

* requirements.txt fixed

* keras<2.7.0

* Update sock_merchant.py

* doctest with black fixed

* Update sock_merchant.py
Co-authored-by: Ngithub-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: NChristian Clauss <cclauss@me.com>

Yesterday hexagonal_numbers.py was created. Added that file in this list(maths/series/hexagonal_numbers.py)

* Added a gray_code_sequence.py file to the bit_manipulation folder

* Added a descriptive name for variable n changing it to bit count

* Update gray_code_sequence.py
Co-authored-by: Nkrishchopra02 <krishchopra02@gmail.com>
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Update base16.py

* Rename base64_encoding.py to base64.py

* Split into functions, Add doctests

* Update base16.py

* [mypy] fix type annotations in circular_queue_linked_list

* Remove 10 blank lines
Co-authored-by: NChristian Clauss <cclauss@me.com>

* Added nevilles algorithm for polynomial interpolation

* Added type hinting for neville_interpolate function arguments.

* Added more descriptive names

* Update nevilles_method.py

* Fixed some linting issues

* Fixed type hinting error

* Fixed nevilles_method.py

* Add ellipsis for doctest spanning multiple lines

* Update nevilles_method.py
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* add gabor_filter.py

* Update gabor_filter.py

* update gabor_filter.py

* add doctest

* change import order

* Update digital_image_processing/filters/gabor_filter.py
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Update gabor_filter.py

* fix gabor filter calculation
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Add stone unit of measuring weight

And some tests in the docs using an external calculator. Not yet tested if they pass.

* Fix rounding descrepencies in doctests to pass tests

* Fix comment

* updating DIRECTORY.md
Co-authored-by: Ngithub-actions <${GITHUB_ACTOR}@users.noreply.github.com>

* Rewrite parts of Vector and Matrix methods

* Refactor determinant method and add unit tests

Refactor determinant method to create separate minor and cofactor
methods.
Add respective unit tests for new methods.
Rename methods using snake case to follow Python naming conventions.

* Reorganize Vector and Matrix methods

* Update linear_algebra/README.md
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Fix punctuation and wording

* Apply suggestions from code review
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Deduplicate euclidean length method for Vector

* Add more unit tests for Euclidean length method

* Fix bug in unit test for euclidean_length

* Remove old comments for magnitude method

* Rewrite maths/fibonacci.py

* Rewrite timer and add unit tests

* Fix typos in fib_binet unit tests

* Fix typos in fib_binet unit tests

* Clean main method
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Add search book via ISBN using openlibrary.org API

* FIX: parameters type hints and isbn sizes

* Add doctests

* Update search_books_by_isbn.py
Co-authored-by: NChristian Clauss <cclauss@me.com>

* Improve solution

* Uncomment code that has been commented due to slow execution affecting Travis

* Retest

* Rewrite parts of Vector and Matrix methods

* Refactor determinant method and add unit tests

Refactor determinant method to create separate minor and cofactor
methods.
Add respective unit tests for new methods.
Rename methods using snake case to follow Python naming conventions.

* Reorganize Vector and Matrix methods

* Update linear_algebra/README.md
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Fix punctuation and wording

* Apply suggestions from code review
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Deduplicate euclidean length method for Vector

* Add more unit tests for Euclidean length method

* Fix bug in unit test for euclidean_length

* Remove old comments for magnitude method

* Rewrite maths/fibonacci.py

* Rewrite timer and add unit tests

* Fix typos in fib_binet unit tests

* Fix typos in fib_binet unit tests

* Clean main method

* Merge fibonacci.py and fibonacci_sequence_recursion.py

* Fix fib_binet unit test
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Fix build issues due to count

* Update check_anagrams.py

* Fix type annotations for linked_stack.py

* Replace Optional with inline union type

* Rename linked_stack to stack_with_singly_linked_list

* Rename stack_using_dll to stack_with_doubly_linked_list

* updating DIRECTORY.md
Co-authored-by: Ngithub-actions <${GITHUB_ACTOR}@users.noreply.github.com>

* Removed doctest call

* Removed 0 and 1 append to `fib_array`

* Moved fibonacci sequence logic into `calculate`

* Refactored `get` to generate missing numbers

* Renamed `fib_array` to `sequence`

* Renamed `number` to `index`

* Refactored `get` to only return sequence to `index`

* Moved main block into function

* Added documentation to `get`

* Added missing type hints

* Fixed doctest error in `get` docstring

* Moved calculate logic into get

* Reformatted with black

* Fixed wrong generation range

* Rewrite parts of Vector and Matrix methods

* Refactor determinant method and add unit tests

Refactor determinant method to create separate minor and cofactor
methods.
Add respective unit tests for new methods.
Rename methods using snake case to follow Python naming conventions.

* Reorganize Vector and Matrix methods

* Update linear_algebra/README.md
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Fix punctuation and wording

* Apply suggestions from code review
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Deduplicate euclidean length method for Vector

* Add more unit tests for Euclidean length method

* Fix bug in unit test for euclidean_length

* Remove old comments for magnitude method
Co-authored-by: NJohn Law <johnlaw.po@gmail.com>

* Local Weighted Learning Added

* Delete LWL directory

* Local Weighted Learning Added

* local weighted learning added

* Delete LWL directory

* Delete local_weighted_learning.py

* rephrased code added

* local weight learning updated

* local weight learning updated

* Updated dir

* updated codespell

* import modification

* Doctests added

* doctests updated

* lcl updated

* doctests updated

* doctest values updated

* Added solution for problem 493

* fixed typo

* return result as string

* Fixes: #5323

* Fixes: #5323

* Fix typos

* Improve solution

* Add solution doctests

* Improve solution function

* Add abstract base class Comparable

* [mypy] Fix type annotations (strict mode)

* Fix a typo

* Remove Comparable class and set bound to bool

* added is_contains_unique_chars()

* added is_contains_unique_chars()

* added stackoverflow reference