[fixed] unused variable, standalone running, import doctest module

matrix/nth_fibonacci_using_matrix_exponentiation.py

@@ -88,4 +88,7 @@ def main():
 
 
 if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()
     main()

matrix/spiral_print.py

@@ -10,8 +10,8 @@
 
 def checkMatrix(a):
     # must be
-    if type(a) == list and len(a) > 0:
-        if type(a[0]) == list:
+    if type(a) == tuple and len(a) > 0:
+        if type(a[0]) == tuple:
             prevLen = 0
             for i in a:
                 if prevLen == 0:
@@ -33,7 +33,7 @@ def spiralPrint(a):
     if checkMatrix(a) and len(a) > 0:
 
         matRow = len(a)
-        if type(a[0]) == list:
+        if type(a[0]) == tuple:
             matCol = len(a[0])
         else:
             for dat in a:
@@ -64,5 +64,6 @@ def spiralPrint(a):
 
 
 # driver code
-a = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
-spiralPrint(a)
+if __name__ == "__main__":
+    a = ([1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12])
+    spiralPrint(a)

other/fischer_yates_shuffle.py

@@ -8,8 +8,8 @@
 import random
 
 
-def FYshuffle(list):
-    for i in range(len(list)):
+def fisher_yates_shuffle(data: list) -> list:
+    for _ in range(len(list)):
         a = random.randint(0, len(list) - 1)
         b = random.randint(0, len(list) - 1)
         list[a], list[b] = list[b], list[a]
@@ -21,4 +21,4 @@ def FYshuffle(list):
     strings = ["python", "says", "hello", "!"]
     print("Fisher-Yates Shuffle:")
     print("List", integers, strings)
-    print("FY Shuffle", FYshuffle(integers), FYshuffle(strings))
+    print("FY Shuffle", fisher_yates_shuffle(integers), fisher_yates_shuffle(strings))