Lesson 2 of 64 · Part 1 · Python & Data Basics · Python Fundamentals · bilingual notes (English + සිංහල)

Key principles

• Variables are just labelled boxes. x = 10 doesn't do maths — it puts the value 10 in a box named x, so you can use it later without retyping it.
  Variables කියන්නෙ label කරපු boxes විතරයි
• print() is how Python talks back to you. Code that runs silently could be doing anything. print() is your first, simplest debugging tool.
  print() කියන්නෙ Python ඔයාට කතා කරන විදිහ

Walkthrough

Programming Languages used for Machine Learning:

1. Python
2. R

#print function

print("Machine Learning")

Output

Machine Learning

print("Machine Learning" + " Projects")

Output

Machine Learning Projects

print(8)

Output

8

print(8+3)

Output

11

#Basic Data types:

1. int
2. float
3. str

type(8)

Output

int

type(5.3)

Output

float

type("english")

Output

str

#Constants & Variables

marvel_super_hero = "Iron Man"
print(marvel_super_hero)

Output

Iron Man

marvel_super_hero = "Captain America"
print(marvel_super_hero)

Output

Captain America

hero1 , hero2 , hero3 = "Iron Man" , "Captain America" , "Bat Man"
print(hero1)
print(hero2)
print(hero3)

Output

Iron Man
Captain America
Bat Man

x = y = z = 23
print(x)
print(y)
print(z)

Output

23
23
23

input Function

number_1 = int(input("Enter the first number : "))
number_2 = int(input("Enter the second number : "))

sum = number_1 + number_2
print(sum)

Output

Enter the first number : 23
Enter the second number : 23
46

# changing the data type in python:
num = 5
print(float(num))

Output

5.0

Keep going: ← Lesson 1 · Lesson 3 → · Track it in the Self Guide