Python Programming: Lesson 70 - Pass by Value and More Techniques for Sets and Dictionaries
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In the previous lesson ( • Python Programming: Lesson 69 - Chara... ), we talked about ASCII character encoding. This happens through two methods:
chr(x) accepts an ASCII character encoding and returns the character with that code
ord(x) accepts a character and returns an integer representing the ASCII character encoding [inverse of chr(x)]
We also review zip(x,y), which is a generator that yields tuples where corresponding elements from x and y line up as far as index positions go. x and y do not have to be the same type of iterable; you could have a list for x and a tuple for y, for example.
In this lesson, we bring up 2 new topics. Python passes information by copying the value of a variable into a method. It does not take the reference of the actual variable, leading to unexpected behavior. There are 3 solutions to this:
1. use an instance variable for an object belonging to a class. Increment it
2. use a return method rather than a void method to return a new value which is an incremented version of the original variable
3. use a list with one element in it, incrementing it
0:28 Overview of JSON, Frozen Dictionaries, The iskeyword function, the type function, hexademical numbers, ASCII character encoding (through ord(x) and chr(x)), and the zip generator
3:41 Review of Hexadecimal Numbers in Python
5:35 Review of ASCII Character Encoding
6:42 Review of The zip(x,y) Generator
9:03 NEW: Pass-by-Value
15:31 NEW: Concise Techniques for Sets
17:42 NEW: Immutable Keys for Dictionaries
An equivalent lesson regarding pass-by-value in Java is available here: • Java Programming: Lesson 71 - Pass by...
In the next lesson ( • Python Programming: Lesson 71 - Const... ), we'll see more examples of pass-by-value, as well as another opportunity to see shorthand notation for sets and immutable keys in dictionaries. We might also have a chance to go back and review hex(x), chr(x), and ord(x).
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