If you were following the

Iterators post, you could think that creating iterable object or generators (that could provide an iterator) in python is not so easy. You should be able to create a class, then implement those special methods, make sure everything works..
But there are easier ways.

Creating a …

In this basic post we'll explain the basics of iterators.

A Python Iterator

• If a python object contains some collection of objects, we need a way to get these object, one at a time.
• Note that:
  • A specific order is optional, but we must make sure that:
  • ..we get each object ONCE, and..
  • ..eventually we get ALL objects. …

We have covered default values for parameters during our discussion of

function parameters.
We now want to explain some more details about that.

Python IS dynamic

• If you are coming from static programming languages (C, C++, Java, C#, Rust, Golang etc..) then you should remind yourself that in python EVERYTHING …

In this example, we create a decorator that will multiply a value returned by a 2 parameters func by a value.

What we want to achieve

• Suppose you have a decorator and a function like the following:

1@mult(5)
2def add_nums(a,b):
3    return a+b

• The idea is that instead of having add_nums(3,4) return 7, it will return …

About bytes

• The python bytes type represents abinary sequence of bytes.
• I use the term "binary" because it is sometimes displayed as a sequence of characters, but it it not text, not it it a string!
• bytes is immutable, whereas bytearray is a mutable version of it.

representation

• A bytes object looks like …

The tasks project

• Flask is a micro web framework.
• You can use it to create web sites, but also to create web services, which are programs that communicate over the http protocol.
• We'll use it here to create a simple web service and api.
• In our api, we'll send and receive JSON strings to represent tasks …

Function decorators are used in many python packages and libraries. Often, you see the @ sign in code before you learn what it is, so you get back to read about decorators.
We'll use a simple example to demonstrate the use of decorators.

What do we try to achieve

• Suppose you have a simple, 2 params function like the …

Open Function Basics

• The open function documentation contains a lot of parameters
• The only positional parameter (file) specifies the path of the file to be read.

Python Basics

• Creating Python virtual environments with Python venv

• Values and Vars

Python builtin Types

• bytes

Python Functions

• function parameters

• function parameters default values

• function decorators basics

• function decorators with parameters

Python Object Oriented …

The basic Truth of Python values and vars

• All of the values in Python are really objects.
  You can think of objects as bags that contain the value itself, with some more operations that you can use with the value (these are called methods).
  We'll talk about object in more details in later posts.
• Each object (i.e value) …