Topics Covered

First Lesson

• One liners
• Anonymous functions
• Default Types
• Map, Reduce, Filter
• How to use native functions
• • List, Max, Sum, Len
• Decorators
• Callback Functions
• Sorting

Second Lesson

• Class and Objects
• Magic Functions
• OOP:
• • Inheritance
• • Polymorphism
• • Encapsulation

Installation

brew install python
pip3 install virtualenv 
brew install --cask pycharm

Setup

virtualenv venv
source ./venv/bin/activate
pip install -r requirements.txt

Examples Map Reduce:

import functools as ft
names = ["Yoav", "Ron", "Aviva", "Ronen", "Dan", "Galit"]
a1 = ft.reduce(lambda x, y: x + y, 
               map(lambda x: len(x), 
                   list(
                        filter(
                            lambda x: len(x) > 4, names)
                        )
                   )
               )

Will print the sum of words that are longer than 4 chars in the name list.

Example Magic Functions:

How can we check if a person is greater than another ?

class Person:
    def __init__(self, name, age=0):
        self.name = name
        self.age = age
        
    def __gt__(self, other):
        return self.age > other.age

p1 = Person("ido",5)
p2 = Person("ziv",15)
print(p1 > p2)

How to sort a dictionary by key?

[
    {
        "name": "ido",
        "age": 35
    },
    {
        "name": "do",
        "age": 16
    },
    {
        "name": "io",
        "age": 41
    },
    {
        "name": "student_id",
        "age": 5
    }
]

We need to sort by key:

import json
with open('people.json', 'r') as fp:
    people = json.load(fp)
people.sort(key=lambda x: x["age"])

We get:

[
  {
    "name": "student_id",
    "age": 5
  },
  {
    "name": "ido",
    "age": 15
  },
  {
    "name": "do",
    "age": 16
  },
  {
    "name": "io",
    "age": 41
  }
]