Merge pull request #6 from zh-beep/main

Implemented hex_get_bytes function

README.md

@@ -260,6 +260,10 @@ Once imported, you can use any of the functions listed below.
     def number_to_engineering_notation(number):
         """Convert the given number to engineering notation."""
     ```
+  - ```python
+    def hex_get_bytes(hex_number, number_of_bytes):
+        """Reduce a hex number number to a specific number of bytes. For example, (0x123456,2) returns '0x1234'."""
+    ```
 
 ## Development
 

d8s_math/maths.py

@@ -690,3 +690,16 @@ def number_to_engineering_notation(number):
 
     decimal_form = decimal.Decimal(number)
     return decimal_form.normalize().to_eng_string()
+
+def hex_get_bytes(hex_number, number_of_bytes):
+    length = len(hex(hex_number)) - 2
+    hex_num_bytes = length/2
+    # print(type(hex_num_bytes))
+    # print(type(number_of_bytes))
+    # print(hex_num_bytes - number_of_bytes)
+    if ((hex_num_bytes < number_of_bytes) or (hex_num_bytes == number_of_bytes)):
+        return hex(hex_number)
+    else:
+        hex_number = hex_number >> math.floor((8*(hex_num_bytes - number_of_bytes)))
+        final_hex = hex(hex_number) 
+        return final_hex