clean of unnecessary checks, imports, calls (#7993)

quantum/q_fourier_transform.py

@@ -55,9 +55,9 @@ def quantum_fourier_transform(number_of_qubits: int = 3) -> qiskit.result.counts
         ...
     ValueError: number of qubits must be exact integer.
     """
-    if type(number_of_qubits) == str:
+    if isinstance(number_of_qubits, str):
         raise TypeError("number of qubits must be a integer.")
-    if not number_of_qubits > 0:
+    if number_of_qubits <= 0:
         raise ValueError("number of qubits must be > 0.")
     if math.floor(number_of_qubits) != number_of_qubits:
         raise ValueError("number of qubits must be exact integer.")

quantum/q_full_adder.py

@@ -60,7 +60,11 @@ def quantum_full_adder(
         ...
     ValueError: inputs must be less or equal to 2.
     """
-    if (type(input_1) == str) or (type(input_2) == str) or (type(carry_in) == str):
+    if (
+        isinstance(input_1, str)
+        or isinstance(input_2, str)
+        or isinstance(carry_in, str)
+    ):
         raise TypeError("inputs must be integers.")
 
     if (input_1 < 0) or (input_2 < 0) or (carry_in < 0):

quantum/superdense_coding.py

@@ -53,7 +53,7 @@ def superdense_coding(bit_1: int = 1, bit_2: int = 1) -> qiskit.result.counts.Co
         ...
     ValueError: inputs must be less or equal to 1.
     """
-    if (type(bit_1) == str) or (type(bit_2) == str):
+    if isinstance(bit_1, str) or isinstance(bit_2, str):
         raise TypeError("inputs must be integers.")
     if (bit_1 < 0) or (bit_2 < 0):
         raise ValueError("inputs must be positive.")