refactor: Move constants outside of variable scope (#7262)

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

ciphers/bifid.py

@@ -9,16 +9,17 @@ https://www.braingle.com/brainteasers/codes/bifid.php
 
 import numpy as np
 
+SQUARE = [
+    ["a", "b", "c", "d", "e"],
+    ["f", "g", "h", "i", "k"],
+    ["l", "m", "n", "o", "p"],
+    ["q", "r", "s", "t", "u"],
+    ["v", "w", "x", "y", "z"],
+]
+
 
 class BifidCipher:
     def __init__(self) -> None:
-        SQUARE = [  # noqa: N806
-            ["a", "b", "c", "d", "e"],
-            ["f", "g", "h", "i", "k"],
-            ["l", "m", "n", "o", "p"],
-            ["q", "r", "s", "t", "u"],
-            ["v", "w", "x", "y", "z"],
-        ]
         self.SQUARE = np.array(SQUARE)
 
     def letter_to_numbers(self, letter: str) -> np.ndarray:

ciphers/brute_force_caesar_cipher.py

@@ -1,3 +1,6 @@
+import string
+
+
 def decrypt(message: str) -> None:
     """
     >>> decrypt('TMDETUX PMDVU')
@@ -28,16 +31,15 @@ def decrypt(message: str) -> None:
     Decryption using Key #24: VOFGVWZ ROFXW
     Decryption using Key #25: UNEFUVY QNEWV
     """
-    LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"  # noqa: N806
-    for key in range(len(LETTERS)):
+    for key in range(len(string.ascii_uppercase)):
         translated = ""
         for symbol in message:
-            if symbol in LETTERS:
-                num = LETTERS.find(symbol)
+            if symbol in string.ascii_uppercase:
+                num = string.ascii_uppercase.find(symbol)
                 num = num - key
                 if num < 0:
-                    num = num + len(LETTERS)
-                translated = translated + LETTERS[num]
+                    num = num + len(string.ascii_uppercase)
+                translated = translated + string.ascii_uppercase[num]
             else:
                 translated = translated + symbol
         print(f"Decryption using Key #{key}: {translated}")

ciphers/polybius.py

@@ -8,16 +8,18 @@ https://www.braingle.com/brainteasers/codes/polybius.php
 
 import numpy as np
 
+SQUARE = [
+    ["a", "b", "c", "d", "e"],
+    ["f", "g", "h", "i", "k"],
+    ["l", "m", "n", "o", "p"],
+    ["q", "r", "s", "t", "u"],
+    ["v", "w", "x", "y", "z"],
+]
+
 
 class PolybiusCipher:
     def __init__(self) -> None:
-        SQUARE = [  # noqa: N806
-            ["a", "b", "c", "d", "e"],
-            ["f", "g", "h", "i", "k"],
-            ["l", "m", "n", "o", "p"],
-            ["q", "r", "s", "t", "u"],
-            ["v", "w", "x", "y", "z"],
-        ]
+
         self.SQUARE = np.array(SQUARE)
 
     def letter_to_numbers(self, letter: str) -> np.ndarray:

compression/peak_signal_to_noise_ratio.py

@@ -11,14 +11,15 @@ import os
 import cv2
 import numpy as np
 
+PIXEL_MAX = 255.0
 
-def psnr(original: float, contrast: float) -> float:
+
+def peak_signal_to_noise_ratio(original: float, contrast: float) -> float:
     mse = np.mean((original - contrast) ** 2)
     if mse == 0:
         return 100
-    PIXEL_MAX = 255.0  # noqa: N806
-    PSNR = 20 * math.log10(PIXEL_MAX / math.sqrt(mse))  # noqa: N806
-    return PSNR
+
+    return 20 * math.log10(PIXEL_MAX / math.sqrt(mse))
 
 
 def main() -> None:
@@ -34,11 +35,11 @@ def main() -> None:
 
     # Value expected: 29.73dB
     print("-- First Test --")
-    print(f"PSNR value is {psnr(original, contrast)} dB")
+    print(f"PSNR value is {peak_signal_to_noise_ratio(original, contrast)} dB")
 
     # # Value expected: 31.53dB (Wikipedia Example)
     print("\n-- Second Test --")
-    print(f"PSNR value is {psnr(original2, contrast2)} dB")
+    print(f"PSNR value is {peak_signal_to_noise_ratio(original2, contrast2)} dB")
 
 
 if __name__ == "__main__":

conversions/binary_to_hexadecimal.py

@@ -1,3 +1,23 @@
+BITS_TO_HEX = {
+    "0000": "0",
+    "0001": "1",
+    "0010": "2",
+    "0011": "3",
+    "0100": "4",
+    "0101": "5",
+    "0110": "6",
+    "0111": "7",
+    "1000": "8",
+    "1001": "9",
+    "1010": "a",
+    "1011": "b",
+    "1100": "c",
+    "1101": "d",
+    "1110": "e",
+    "1111": "f",
+}
+
+
 def bin_to_hexadecimal(binary_str: str) -> str:
     """
     Converting a binary string into hexadecimal using Grouping Method
@@ -17,25 +37,6 @@ def bin_to_hexadecimal(binary_str: str) -> str:
     ...
     ValueError: Empty string was passed to the function
     """
-    BITS_TO_HEX = {  # noqa: N806
-        "0000": "0",
-        "0001": "1",
-        "0010": "2",
-        "0011": "3",
-        "0100": "4",
-        "0101": "5",
-        "0110": "6",
-        "0111": "7",
-        "1000": "8",
-        "1001": "9",
-        "1010": "a",
-        "1011": "b",
-        "1100": "c",
-        "1101": "d",
-        "1110": "e",
-        "1111": "f",
-    }
-
     # Sanitising parameter
     binary_str = str(binary_str).strip()
 

conversions/decimal_to_any.py

@@ -1,5 +1,9 @@
 """Convert a positive Decimal Number to Any Other Representation"""
 
+from string import ascii_uppercase
+
+ALPHABET_VALUES = {str(ord(c) - 55): c for c in ascii_uppercase}
+
 
 def decimal_to_any(num: int, base: int) -> str:
     """
@@ -65,13 +69,6 @@ def decimal_to_any(num: int, base: int) -> str:
         raise ValueError("base must be >= 2")
     if base > 36:
         raise ValueError("base must be <= 36")
-    # fmt: off
-    ALPHABET_VALUES = {'10': 'A', '11': 'B', '12': 'C', '13': 'D', '14': 'E', '15': 'F',  # noqa: N806, E501
-                       '16': 'G', '17': 'H', '18': 'I', '19': 'J', '20': 'K', '21': 'L',
-                       '22': 'M', '23': 'N', '24': 'O', '25': 'P', '26': 'Q', '27': 'R',
-                       '28': 'S', '29': 'T', '30': 'U', '31': 'V', '32': 'W', '33': 'X',
-                       '34': 'Y', '35': 'Z'}
-    # fmt: on
     new_value = ""
     mod = 0
     div = 0

conversions/roman_numerals.py

@@ -1,3 +1,20 @@
+ROMAN = [
+    (1000, "M"),
+    (900, "CM"),
+    (500, "D"),
+    (400, "CD"),
+    (100, "C"),
+    (90, "XC"),
+    (50, "L"),
+    (40, "XL"),
+    (10, "X"),
+    (9, "IX"),
+    (5, "V"),
+    (4, "IV"),
+    (1, "I"),
+]
+
+
 def roman_to_int(roman: str) -> int:
     """
     LeetCode No. 13 Roman to Integer
@@ -29,21 +46,6 @@ def int_to_roman(number: int) -> str:
     >>> all(int_to_roman(value) == key for key, value in tests.items())
     True
     """
-    ROMAN = [  # noqa: N806
-        (1000, "M"),
-        (900, "CM"),
-        (500, "D"),
-        (400, "CD"),
-        (100, "C"),
-        (90, "XC"),
-        (50, "L"),
-        (40, "XL"),
-        (10, "X"),
-        (9, "IX"),
-        (5, "V"),
-        (4, "IV"),
-        (1, "I"),
-    ]
     result = []
     for (arabic, roman) in ROMAN:
         (factor, number) = divmod(number, arabic)

geodesy/haversine_distance.py

@@ -1,5 +1,9 @@
 from math import asin, atan, cos, radians, sin, sqrt, tan
 
+AXIS_A = 6378137.0
+AXIS_B = 6356752.314245
+RADIUS = 6378137
+
 
 def haversine_distance(lat1: float, lon1: float, lat2: float, lon2: float) -> float:
     """
@@ -30,9 +34,6 @@ def haversine_distance(lat1: float, lon1: float, lat2: float, lon2: float) -> fl
     """
     # CONSTANTS per WGS84 https://en.wikipedia.org/wiki/World_Geodetic_System
     # Distance in metres(m)
-    AXIS_A = 6378137.0  # noqa: N806
-    AXIS_B = 6356752.314245  # noqa: N806
-    RADIUS = 6378137  # noqa: N806
     # Equation parameters
     # Equation https://en.wikipedia.org/wiki/Haversine_formula#Formulation
     flattening = (AXIS_A - AXIS_B) / AXIS_A

geodesy/lamberts_ellipsoidal_distance.py

@@ -2,6 +2,10 @@ from math import atan, cos, radians, sin, tan
 
 from .haversine_distance import haversine_distance
 
+AXIS_A = 6378137.0
+AXIS_B = 6356752.314245
+EQUATORIAL_RADIUS = 6378137
+
 
 def lamberts_ellipsoidal_distance(
     lat1: float, lon1: float, lat2: float, lon2: float
@@ -45,10 +49,6 @@ def lamberts_ellipsoidal_distance(
 
     # CONSTANTS per WGS84 https://en.wikipedia.org/wiki/World_Geodetic_System
     # Distance in metres(m)
-    AXIS_A = 6378137.0  # noqa: N806
-    AXIS_B = 6356752.314245  # noqa: N806
-    EQUATORIAL_RADIUS = 6378137  # noqa: N806
-
     # Equation Parameters
     # https://en.wikipedia.org/wiki/Geographical_distance#Lambert's_formula_for_long_lines
     flattening = (AXIS_A - AXIS_B) / AXIS_A

hashes/adler32.py

@@ -8,6 +8,8 @@
     source: https://en.wikipedia.org/wiki/Adler-32
 """
 
+MOD_ADLER = 65521
+
 
 def adler32(plain_text: str) -> int:
     """
@@ -20,7 +22,6 @@ def adler32(plain_text: str) -> int:
     >>> adler32('go adler em all')
     708642122
     """
-    MOD_ADLER = 65521  # noqa: N806
     a = 1
     b = 0
     for plain_chr in plain_text:

physics/n_body_simulation.py

@@ -19,6 +19,12 @@ import random
 from matplotlib import animation
 from matplotlib import pyplot as plt
 
+# Frame rate of the animation
+INTERVAL = 20
+
+# Time between time steps in seconds
+DELTA_TIME = INTERVAL / 1000
+
 
 class Body:
     def __init__(
@@ -219,12 +225,6 @@ def plot(
     Utility function to plot how the given body-system evolves over time.
     No doctest provided since this function does not have a return value.
     """
-    # Frame rate of the animation
-    INTERVAL = 20  # noqa: N806
-
-    # Time between time steps in seconds
-    DELTA_TIME = INTERVAL / 1000  # noqa: N806
-
     fig = plt.figure()
     fig.canvas.set_window_title(title)
     ax = plt.axes(

project_euler/problem_054/test_poker_hand.py

@@ -185,12 +185,12 @@ def test_compare_random(hand, other, expected):
 
 
 def test_hand_sorted():
-    POKER_HANDS = [PokerHand(hand) for hand in SORTED_HANDS]  # noqa: N806
-    list_copy = POKER_HANDS.copy()
+    poker_hands = [PokerHand(hand) for hand in SORTED_HANDS]
+    list_copy = poker_hands.copy()
     shuffle(list_copy)
     user_sorted = chain(sorted(list_copy))
     for index, hand in enumerate(user_sorted):
-        assert hand == POKER_HANDS[index]
+        assert hand == poker_hands[index]
 
 
 def test_custom_sort_five_high_straight():

project_euler/problem_064/sol1.py

@@ -33,13 +33,13 @@ def continuous_fraction_period(n: int) -> int:
     """
     numerator = 0.0
     denominator = 1.0
-    ROOT = int(sqrt(n))  # noqa: N806
-    integer_part = ROOT
+    root = int(sqrt(n))
+    integer_part = root
     period = 0
-    while integer_part != 2 * ROOT:
+    while integer_part != 2 * root:
         numerator = denominator * integer_part - numerator
         denominator = (n - numerator**2) / denominator
-        integer_part = int((ROOT + numerator) / denominator)
+        integer_part = int((root + numerator) / denominator)
         period += 1
     return period
 

project_euler/problem_097/sol1.py

@@ -34,9 +34,9 @@ def solution(n: int = 10) -> str:
     """
     if not isinstance(n, int) or n < 0:
         raise ValueError("Invalid input")
-    MODULUS = 10**n  # noqa: N806
-    NUMBER = 28433 * (pow(2, 7830457, MODULUS)) + 1  # noqa: N806
-    return str(NUMBER % MODULUS)
+    modulus = 10**n
+    number = 28433 * (pow(2, 7830457, modulus)) + 1
+    return str(number % modulus)
 
 
 if __name__ == "__main__":

project_euler/problem_125/sol1.py

@@ -13,6 +13,8 @@ Find the sum of all the numbers less than 10^8 that are both palindromic and can
 be written as the sum of consecutive squares.
 """
 
+LIMIT = 10**8
+
 
 def is_palindrome(n: int) -> bool:
     """
@@ -35,7 +37,6 @@ def solution() -> int:
     Returns the sum of all numbers less than 1e8 that are both palindromic and
     can be written as the sum of consecutive squares.
     """
-    LIMIT = 10**8  # noqa: N806
     answer = set()
     first_square = 1
     sum_squares = 5

sorts/radix_sort.py

@@ -5,6 +5,8 @@ Source: https://en.wikipedia.org/wiki/Radix_sort
 """
 from __future__ import annotations
 
+RADIX = 10
+
 
 def radix_sort(list_of_ints: list[int]) -> list[int]:
     """
@@ -19,7 +21,6 @@ def radix_sort(list_of_ints: list[int]) -> list[int]:
     >>> radix_sort([1,100,10,1000]) == sorted([1,100,10,1000])
     True
     """
-    RADIX = 10  # noqa: N806
     placement = 1
     max_digit = max(list_of_ints)
     while placement <= max_digit:

web_programming/fetch_quotes.py

@@ -10,15 +10,15 @@ import pprint
 
 import requests
 
+API_ENDPOINT_URL = "https://zenquotes.io/api"
+
 
 def quote_of_the_day() -> list:
-    API_ENDPOINT_URL = "https://zenquotes.io/api/today/"  # noqa: N806
-    return requests.get(API_ENDPOINT_URL).json()
+    return requests.get(API_ENDPOINT_URL + "/today").json()
 
 
 def random_quotes() -> list:
-    API_ENDPOINT_URL = "https://zenquotes.io/api/random/"  # noqa: N806
-    return requests.get(API_ENDPOINT_URL).json()
+    return requests.get(API_ENDPOINT_URL + "/random").json()
 
 
 if __name__ == "__main__":