Merge 5717e7cc8f into 6c92c5a539

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.9.2 → v0.9.3](https://github.com/astral-sh/ruff-pre-commit/compare/v0.9.2...v0.9.3)
- [github.com/codespell-project/codespell: v2.3.0 → v2.4.0](https://github.com/codespell-project/codespell/compare/v2.3.0...v2.4.0)

* Update trifid_cipher.py

* Update pyproject.toml

* Update trifid_cipher.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>

.github/workflows/sphinx.yml

@@ -23,7 +23,7 @@ concurrency:
 
 jobs:
   build_docs:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@v4
       - uses: astral-sh/setup-uv@v5

.pre-commit-config.yaml

@@ -16,13 +16,13 @@ repos:
       - id: auto-walrus
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.9.1
+    rev: v0.9.3
     hooks:
       - id: ruff
       - id: ruff-format
 
   - repo: https://github.com/codespell-project/codespell
-    rev: v2.3.0
+    rev: v2.4.0
     hooks:
       - id: codespell
         additional_dependencies:

DIRECTORY.md

@@ -377,6 +377,7 @@
   * [Longest Common Subsequence](dynamic_programming/longest_common_subsequence.py)
   * [Longest Common Substring](dynamic_programming/longest_common_substring.py)
   * [Longest Increasing Subsequence](dynamic_programming/longest_increasing_subsequence.py)
+  * [Longest Increasing Subsequence Iterative](dynamic_programming/longest_increasing_subsequence_iterative.py)
   * [Longest Increasing Subsequence O Nlogn](dynamic_programming/longest_increasing_subsequence_o_nlogn.py)
   * [Longest Palindromic Subsequence](dynamic_programming/longest_palindromic_subsequence.py)
   * [Matrix Chain Multiplication](dynamic_programming/matrix_chain_multiplication.py)
@@ -462,6 +463,7 @@
 
 ## Graphics
   * [Bezier Curve](graphics/bezier_curve.py)
+  * [Butterfly Pattern](graphics/butterfly_pattern.py)
   * [Digital Differential Analyzer Line](graphics/digital_differential_analyzer_line.py)
   * [Vector3 For 2D Rendering](graphics/vector3_for_2d_rendering.py)
 

audio_filters/butterworth_filter.py

@@ -1,12 +1,11 @@
 from math import cos, sin, sqrt, tau
-
 from audio_filters.iir_filter import IIRFilter
 
 """
 Create 2nd-order IIR filters with Butterworth design.
 
 Code based on https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html
-Alternatively you can use scipy.signal.butter, which should yield the same results.
+Alternatively, you can use scipy.signal.butter, which should yield the same results.
 """
 
 
@@ -208,27 +207,33 @@ def make_highshelf(
 
     >>> filter = make_highshelf(1000, 48000, 6)
     >>> filter.a_coeffs + filter.b_coeffs  # doctest: +NORMALIZE_WHITESPACE
-    [2.2229172136088806, -3.9587208137297303, 1.7841414181566304, 4.295432981120543,
+    [2.2229172136088806, -3.616080374557819, 1.4122939941901636, 0.5690651073937642,
-     -7.922740859457287, 3.6756456963725253]
+     -1.3335115824061685, 0.7666141956641752]
     """
     w0 = tau * frequency / samplerate
     _sin = sin(w0)
     _cos = cos(w0)
     alpha = _sin / (2 * q_factor)
     big_a = 10 ** (gain_db / 40)
-    pmc = (big_a + 1) - (big_a - 1) * _cos
+    pmc = (big_a + 1) + (big_a - 1) * _cos
-    ppmc = (big_a + 1) + (big_a - 1) * _cos
+    ppmc = (big_a + 1) - (big_a - 1) * _cos
-    mpc = (big_a - 1) - (big_a + 1) * _cos
+    mpc = (big_a - 1) + (big_a + 1) * _cos
-    pmpc = (big_a - 1) + (big_a + 1) * _cos
+    pmpc = (big_a - 1) - (big_a + 1) * _cos
     aa2 = 2 * sqrt(big_a) * alpha
 
-    b0 = big_a * (ppmc + aa2)
+    b0 = big_a * (pmc - aa2)
-    b1 = -2 * big_a * pmpc
+    b1 = -2 * big_a * mpc
-    b2 = big_a * (ppmc - aa2)
+    b2 = big_a * (pmc + aa2)
-    a0 = pmc + aa2
+    a0 = ppmc - aa2
-    a1 = 2 * mpc
+    a1 = 2 * pmpc
-    a2 = pmc - aa2
+    a2 = ppmc + aa2
 
     filt = IIRFilter(2)
     filt.set_coefficients([a0, a1, a2], [b0, b1, b2])
     return filt
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()

ciphers/trifid_cipher.py

@@ -88,7 +88,7 @@ def __prepare(
         ...
     KeyError: 'Length of alphabet has to be 27.'
 
-    Testing with punctuations that are not in the given alphabet
+    Testing with punctuation not in the given alphabet
 
     >>> __prepare('am i a boy?','abCdeFghijkLmnopqrStuVwxYZ+')
     Traceback (most recent call last):
@@ -128,7 +128,7 @@ def encrypt_message(
     encrypt_message
     ===============
 
-    Encrypts a message using the trifid_cipher. Any punctuatuions that
+    Encrypts a message using the trifid_cipher. Any punctuatuion chars that
     would be used should be added to the alphabet.
 
     PARAMETERS

data_structures/arrays/sudoku_solver.py

@@ -9,7 +9,9 @@ import time
 
 
 def cross(items_a, items_b):
-    "Cross product of elements in A and elements in B."
+    """
+    Cross product of elements in A and elements in B.
+    """
     return [a + b for a in items_a for b in items_b]
 
 
@@ -27,7 +29,7 @@ peers = {s: {x for u in units[s] for x in u} - {s} for s in squares}
 
 
 def test():
-    "A set of unit tests."
+    """A set of unit tests."""
     assert len(squares) == 81
     assert len(unitlist) == 27
     assert all(len(units[s]) == 3 for s in squares)
@@ -47,8 +49,10 @@ def test():
 
 
 def parse_grid(grid):
-    """Convert grid to a dict of possible values, {square: digits}, or
+    """
-    return False if a contradiction is detected."""
+    Convert grid to a dict of possible values, {square: digits}, or
+    return False if a contradiction is detected.
+    """
     ## To start, every square can be any digit; then assign values from the grid.
     values = {s: digits for s in squares}
     for s, d in grid_values(grid).items():
@@ -58,15 +62,19 @@ def parse_grid(grid):
 
 
 def grid_values(grid):
-    "Convert grid into a dict of {square: char} with '0' or '.' for empties."
+    """
+    Convert grid into a dict of {square: char} with '0' or '.' for empties.
+    """
     chars = [c for c in grid if c in digits or c in "0."]
     assert len(chars) == 81
     return dict(zip(squares, chars))
 
 
 def assign(values, s, d):
-    """Eliminate all the other values (except d) from values[s] and propagate.
+    """
-    Return values, except return False if a contradiction is detected."""
+    Eliminate all the other values (except d) from values[s] and propagate.
+    Return values, except return False if a contradiction is detected.
+    """
     other_values = values[s].replace(d, "")
     if all(eliminate(values, s, d2) for d2 in other_values):
         return values
@@ -75,8 +83,10 @@ def assign(values, s, d):
 
 
 def eliminate(values, s, d):
-    """Eliminate d from values[s]; propagate when values or places <= 2.
+    """
-    Return values, except return False if a contradiction is detected."""
+    Eliminate d from values[s]; propagate when values or places <= 2.
+    Return values, except return False if a contradiction is detected.
+    """
     if d not in values[s]:
         return values  ## Already eliminated
     values[s] = values[s].replace(d, "")
@@ -99,7 +109,9 @@ def eliminate(values, s, d):
 
 
 def display(values):
-    "Display these values as a 2-D grid."
+    """
+    Display these values as a 2-D grid.
+    """
     width = 1 + max(len(values[s]) for s in squares)
     line = "+".join(["-" * (width * 3)] * 3)
     for r in rows:
@@ -114,11 +126,14 @@ def display(values):
 
 
 def solve(grid):
+    """
+    Solve the grid.
+    """
     return search(parse_grid(grid))
 
 
 def some(seq):
-    "Return some element of seq that is true."
+    """Return some element of seq that is true."""
     for e in seq:
         if e:
             return e
@@ -126,7 +141,9 @@ def some(seq):
 
 
 def search(values):
-    "Using depth-first search and propagation, try all possible values."
+    """
+    Using depth-first search and propagation, try all possible values.
+    """
     if values is False:
         return False  ## Failed earlier
     if all(len(values[s]) == 1 for s in squares):
@@ -137,9 +154,11 @@ def search(values):
 
 
 def solve_all(grids, name="", showif=0.0):
-    """Attempt to solve a sequence of grids. Report results.
+    """
+    Attempt to solve a sequence of grids. Report results.
     When showif is a number of seconds, display puzzles that take longer.
-    When showif is None, don't display any puzzles."""
+    When showif is None, don't display any puzzles.
+    """
 
     def time_solve(grid):
         start = time.monotonic()
@@ -162,7 +181,9 @@ def solve_all(grids, name="", showif=0.0):
 
 
 def solved(values):
-    "A puzzle is solved if each unit is a permutation of the digits 1 to 9."
+    """
+    A puzzle is solved if each unit is a permutation of the digits 1 to 9.
+    """
 
     def unitsolved(unit):
         return {values[s] for s in unit} == set(digits)
@@ -177,9 +198,11 @@ def from_file(filename, sep="\n"):
 
 
 def random_puzzle(assignments=17):
-    """Make a random puzzle with N or more assignments. Restart on contradictions.
+    """
+    Make a random puzzle with N or more assignments. Restart on contradictions.
     Note the resulting puzzle is not guaranteed to be solvable, but empirically
-    about 99.8% of them are solvable. Some have multiple solutions."""
+    about 99.8% of them are solvable. Some have multiple solutions.
+    """
     values = {s: digits for s in squares}
     for s in shuffled(squares):
         if not assign(values, s, random.choice(values[s])):
@@ -191,7 +214,9 @@ def random_puzzle(assignments=17):
 
 
 def shuffled(seq):
-    "Return a randomly shuffled copy of the input sequence."
+    """
+    Return a randomly shuffled copy of the input sequence.
+    """
     seq = list(seq)
     random.shuffle(seq)
     return seq

data_structures/binary_tree/avl_tree.py

@@ -221,6 +221,10 @@ def del_node(root: MyNode, data: Any) -> MyNode | None:
     else:
         root.set_right(del_node(right_child, data))
 
+    # Re-fetch left_child and right_child references
+    left_child = root.get_left()
+    right_child = root.get_right()
+
     if get_height(right_child) - get_height(left_child) == 2:
         assert right_child is not None
         if get_height(right_child.get_right()) > get_height(right_child.get_left()):

other/doomsday.py

@@ -46,7 +46,7 @@ def get_week_day(year: int, month: int, day: int) -> str:
     ) % 7
     day_anchor = (
         DOOMSDAY_NOT_LEAP[month - 1]
-        if (year % 4 != 0) or (centurian == 0 and (year % 400) == 0)
+        if year % 4 != 0 or (centurian == 0 and year % 400 != 0)
         else DOOMSDAY_LEAP[month - 1]
     )
     week_day = (dooms_day + day - day_anchor) % 7

pyproject.toml

@@ -159,7 +159,7 @@ lint.pylint.max-returns = 8 # default: 6
 lint.pylint.max-statements = 88 # default: 50
 
 [tool.codespell]
-ignore-words-list = "3rt,ans,bitap,crate,damon,fo,followings,hist,iff,kwanza,manuel,mater,secant,som,sur,tim,toi,zar"
+ignore-words-list = "3rt,abd,aer,ans,bitap,crate,damon,fo,followings,hist,iff,kwanza,manuel,mater,secant,som,sur,tim,toi,zar"
 skip = "./.*,*.json,*.lock,ciphers/prehistoric_men.txt,project_euler/problem_022/p022_names.txt,pyproject.toml,strings/dictionary.txt,strings/words.txt"
 
 [tool.pytest.ini_options]

sorts/bubble_sort.py

@@ -85,6 +85,8 @@ def bubble_sort_recursive(collection: list[Any]) -> list[Any]:
     [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7]
     >>> bubble_sort_recursive([1, 3.3, 5, 7.7, 2, 4.4, 6])
     [1, 2, 3.3, 4.4, 5, 6, 7.7]
+    >>> bubble_sort_recursive(['a', 'Z', 'B', 'C', 'A', 'c'])
+    ['A', 'B', 'C', 'Z', 'a', 'c']
     >>> import random
     >>> collection_arg = random.sample(range(-50, 50), 100)
     >>> bubble_sort_recursive(collection_arg) == sorted(collection_arg)