add reverse_bits.py

bit_manipulation/reverse_bits.py

@@ -0,0 +1,85 @@
+def get_reverse_bit_string(number: int) -> str:
+    """
+    return the bit string of an integer
+
+    >>> get_reverse_bit_string(9)
+    '10010000000000000000000000000000'
+    >>> get_reverse_bit_string(43)
+    '11010100000000000000000000000000'
+    >>> get_reverse_bit_string(2873)
+    '10011100110100000000000000000000'
+    >>> get_reverse_bit_string("this is not a number")
+    Traceback (most recent call last):
+        ...
+    TypeError: operation can not be conducted on a object of type str
+    """
+    if not isinstance(number, int):
+        raise TypeError(
+            "operation can not be conducted on a object of type "
+            f"{type(number).__name__}"
+        )
+    bit_string = ""
+    for _ in range(0, 32):
+        bit_string += str(number % 2)
+        number = number >> 1
+    return bit_string
+
+
+def reverse_bit(number: int) -> str:
+    """
+    Take in an 32 bit integer, reverse its bits,
+    return a string of reverse bits
+
+    result of a reverse_bit and operation on the integer provided.
+
+    >>> reverse_bit(25)
+    '00000000000000000000000000011001'
+    >>> reverse_bit(37)
+    '00000000000000000000000000100101'
+    >>> reverse_bit(21)
+    '00000000000000000000000000010101'
+    >>> reverse_bit(58)
+    '00000000000000000000000000111010'
+    >>> reverse_bit(0)
+    '00000000000000000000000000000000'
+    >>> reverse_bit(256)
+    '00000000000000000000000100000000'
+    >>> reverse_bit(-1)
+    Traceback (most recent call last):
+        ...
+    ValueError: the value of input must be positive
+
+    >>> reverse_bit(1.1)
+    Traceback (most recent call last):
+        ...
+    TypeError: Input value must be a 'int' type
+
+    >>> reverse_bit("0")
+    Traceback (most recent call last):
+        ...
+    TypeError: '<' not supported between instances of 'str' and 'int'
+    """
+    if number < 0:
+        raise ValueError("the value of input must be positive")
+    elif isinstance(number, float):
+        raise TypeError("Input value must be a 'int' type")
+    elif isinstance(number, str):
+        raise TypeError("'<' not supported between instances of 'str' and 'int'")
+    result = 0
+    # iterator over [1 to 32],since we are dealing with 32 bit integer
+    for _ in range(1, 33):
+        # left shift the bits by unity
+        result = result << 1
+        # get the end bit
+        end_bit = number % 2
+        # right shift the bits by unity
+        number = number >> 1
+        # add that bit to our ans
+        result = result | end_bit
+    return get_reverse_bit_string(result)
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()