Learn Python: a Beginner Tutorial

Follow these lessons in order. Each one has a short explanation and code you can run instantly in My Compiler.

Lesson 1: Hello, World!
Every language starts here: print a message to the screen to check that everything works.
```
print("Hello, World!")
```
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Lesson 2: Variables
Variables store values such as text, whole numbers and decimals so you can reuse them.
```
name = "Ada"
age = 21
height = 1.75
print(name, age, height)
```
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Lesson 3: Conditions
if / else lets your program choose a path depending on a value.
```
age = 18
if age >= 18:
    print("Adult")
elif age >= 13:
    print("Teenager")
else:
    print("Child")
```
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Lesson 4: Loops
Loops repeat a block of code: use for when you know the count and while when you wait for a condition.
```
for i in range(1, 6):
    print(i)

n = 3
while n > 0:
    print("Countdown", n)
    n -= 1
```
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Lesson 5: Functions
A function packs code into a reusable block that takes inputs and returns a result.
```
def add(a, b):
    return a + b

print(add(2, 3))
```
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Lesson 6: Fibonacci sequence
Each number is the sum of the two before it. A classic exercise that combines variables, loops and arithmetic.
```
def fib(n):
    a, b = 0, 1
    for _ in range(n):
        print(a, end=" ")
        a, b = b, a + b

fib(10)
```
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