Improve code on f-strings and brevity (#6126)

* Update strassen_matrix_multiplication.py

* Update matrix_operation.py

* Update enigma_machine2.py

* Update enigma_machine.py

* Update enigma_machine2.py

* Update rod_cutting.py

* Update external_sort.py

* Update sol1.py

* Update hill_cipher.py

* Update prime_numbers.py

* Update integration_by_simpson_approx.py

ciphers/enigma_machine2.py

@@ -94,15 +94,15 @@ def _validator(
     rotorpos1, rotorpos2, rotorpos3 = rotpos
     if not 0 < rotorpos1 <= len(abc):
         raise ValueError(
-            f"First rotor position is not within range of 1..26 (" f"{rotorpos1}"
+            "First rotor position is not within range of 1..26 (" f"{rotorpos1}"
         )
     if not 0 < rotorpos2 <= len(abc):
         raise ValueError(
-            f"Second rotor position is not within range of 1..26 (" f"{rotorpos2})"
+            "Second rotor position is not within range of 1..26 (" f"{rotorpos2})"
         )
     if not 0 < rotorpos3 <= len(abc):
         raise ValueError(
-            f"Third rotor position is not within range of 1..26 (" f"{rotorpos3})"
+            "Third rotor position is not within range of 1..26 (" f"{rotorpos3})"
         )
 
     # Validates string and returns dict

ciphers/hill_cipher.py

@@ -62,7 +62,7 @@ class HillCipher:
     # take x and return x % len(key_string)
     modulus = numpy.vectorize(lambda x: x % 36)
 
-    to_int = numpy.vectorize(lambda x: round(x))
+    to_int = numpy.vectorize(round)
 
     def __init__(self, encrypt_key: numpy.ndarray) -> None:
         """