Last Updated on May 4, 2023 by mishou
Work in progress.
1. Basics 1 Self-taught learning
2. Basics 2 Making your cheat sheets
3. Basics 3 Google Colaboratory
4. Basics 4 Mathematical operators
5. Basics 5 Autofill and List Comprehensions
6. Basics 6 Tables
7. Basics 7 Classes and Objects
8. Basics 8 Pivot Tables
9. Basics 9 Sample Data Sets
10. Basics 10 Flash Fill
11. Basics 11 Charts
12. Basics 12 Loops
13. Basics 13 Funcitons
14. Basics 14 Macros
I. Classes and objects
- Class: The class is a user-defined data structure that binds the data and methods into a single unit. You can create objects with Class.
- Object: An object is an instance of a class. It is a collection of attributes and methods.
II. Create a class using the dataclasses module
Dataclasses significantly decrease the amount of boilerplate codes required to write.
from dataclasses import dataclass @dataclass class Student: name: str english: float math: float group: str def mean_score(self): return (self.english + self.math) / 2
# instantiate objects joe = Student('Joe', 50, 60, 'A') betty = Student('Betty', 70, 80, 'A') jonny = Student('Mishou', 10, 20, 'B') mary = Student('Mary', 30, 40, 'B')
Let’s calculate the mean of english and math of joe
Let’s calculate the mean of english of all students
# create a list of all the Student objects: students = [joe, betty, jonny, mary] # calculate the total of all the English scores: english_total = 0 for student in students: english_total += student.english # calculate the mean of the English scores: english_mean = english_total / len(students) print(english_mean)
III. Create classes and objects without using the dataclasses module
# creating class and objects without dataclasses # create a class class StudentB: def __init__(self, id, english, math, group): self.id = id self.english = english self.math = math self.group = group def __repr__(self): return str((self.id, self.english, self.math, self.group)) def mean_score(self): # calculate the mean of english and math return (self.english + self.math)/2 # create a list of objects students = [StudentB(2, 50, 60, 'A'), StudentB(1, 60, 70, 'A'), StudentB(3, 40, 50, 'B')] # sort objects by id print(sorted(students, key=lambda x: x.id))
You can see all the scripts here: