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--- other:python:misc_by_jyp [2023/04/27 17:52] – [Data representation] Improved jypeter
+++ other:python:misc_by_jyp [2023/04/28 16:11] – [Numerical values] Added low level array addressing jypeter
@@ Line 35: / Line 35: @@
 A few notes for a future section or page about about //data representation// (bits and bytes) on disk and in memory, vs //data format//
+==== Numerical values ====
   * Binary data representation of some numbers:
@@ Line 113: / Line 116: @@
 '00000003 00000011'
 </code>
+  * Manipulating binary data with [[https://docs.python.org/3/library/stdtypes.html#binary-sequence-types-bytes-bytearray-memoryview|bytes, bytearray, memoryview]]
   * Array addressing
+    * [[https://www.geeksforgeeks.org/calculation-of-address-of-element-of-1-d-2-d-and-3-d-using-row-major-and-column-major-order/|Calculation of address of element of 1-D, 2-D, and 3-D using row-major and column-major order]]
+      * In other words: //using indices to go from 1-D to n-Dimnensions data//
+    * The [[https://en.wikipedia.org/wiki/Array_(data_structure)|array]] structure
     * python/C vs Fortran...
@@ Line 128: / Line 136: @@
   * Misc : ''md5sum''
+==== Strings ====
+  * Encoding, [[https://en.wikipedia.org/wiki/ASCII|ASCII]], [[https://en.wikipedia.org/wiki/Unicode|unicode]], [[https://en.wikipedia.org/wiki/UTF-8|UTF-8]], ...
+  * Getting the binary representation of a string
+    * <code>>>> test_string = 'A B 0 1 à µ'
+>>> type(test_string)
+<class 'str'>
+>>> len(test_string)
+>>> test_string_bin = test_string.encode('utf-8')
+>>> test_string_bin
+b'A B 0 1 \xc3\xa0 \xc2\xb5'
+>>> type(test_string_bin)
+<class 'bytes'>
+>>> len(test_string_bin)
+>>> test_string_bin.hex('-')
+'41-20-42-20-30-20-31-20-c3-a0-20-c2-b5'
+</code>
 ===== Checking if a file/directory is writable by the current user =====