Improve Quine–McCluskey algorithm (#4935)

* Syntax improvements (I hope) to boolean algebra

* Reverted certain index variables to i

* remove extra line on decimal_to_binary

* Update quine_mc_cluskey.py

Co-authored-by: John Law <johnlaw.po@gmail.com>

boolean_algebra/quine_mc_cluskey.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from typing import Sequence
+
 
 def compare_string(string1: str, string2: str) -> str:
     """
@@ -9,17 +11,17 @@ def compare_string(string1: str, string2: str) -> str:
     >>> compare_string('0110','1101')
     'X'
     """
-    l1 = list(string1)
-    l2 = list(string2)
+    list1 = list(string1)
+    list2 = list(string2)
     count = 0
-    for i in range(len(l1)):
-        if l1[i] != l2[i]:
+    for i in range(len(list1)):
+        if list1[i] != list2[i]:
             count += 1
-            l1[i] = "_"
+            list1[i] = "_"
     if count > 1:
         return "X"
     else:
-        return "".join(l1)
+        return "".join(list1)
 
 
 def check(binary: list[str]) -> list[str]:
@@ -28,7 +30,7 @@ def check(binary: list[str]) -> list[str]:
     ['0.00.01.5']
     """
     pi = []
-    while 1:
+    while True:
         check1 = ["$"] * len(binary)
         temp = []
         for i in range(len(binary)):
@@ -46,19 +48,18 @@ def check(binary: list[str]) -> list[str]:
         binary = list(set(temp))
 
 
-def decimal_to_binary(no_of_variable: int, minterms: list[float]) -> list[str]:
+def decimal_to_binary(no_of_variable: int, minterms: Sequence[float]) -> list[str]:
     """
     >>> decimal_to_binary(3,[1.5])
     ['0.00.01.5']
     """
     temp = []
-    s = ""
-    for m in minterms:
+    for minterm in minterms:
+        string = ""
         for i in range(no_of_variable):
-            s = str(m % 2) + s
-            m //= 2
-        temp.append(s)
-        s = ""
+            string = str(minterm % 2) + string
+            minterm //= 2
+        temp.append(string)
     return temp
 
 
@@ -70,16 +71,13 @@ def is_for_table(string1: str, string2: str, count: int) -> bool:
     >>> is_for_table('01_','001',1)
     False
     """
-    l1 = list(string1)
-    l2 = list(string2)
+    list1 = list(string1)
+    list2 = list(string2)
     count_n = 0
-    for i in range(len(l1)):
-        if l1[i] != l2[i]:
+    for i in range(len(list1)):
+        if list1[i] != list2[i]:
             count_n += 1
-    if count_n == count:
-        return True
-    else:
-        return False
+    return count_n == count
 
 
 def selection(chart: list[list[int]], prime_implicants: list[str]) -> list[str]:
@@ -108,7 +106,7 @@ def selection(chart: list[list[int]], prime_implicants: list[str]) -> list[str]:
                     for k in range(len(chart)):
                         chart[k][j] = 0
             temp.append(prime_implicants[i])
-    while 1:
+    while True:
         max_n = 0
         rem = -1
         count_n = 0