Python in 99 seconds

learn_python.py

# Variables
x = 5
y = 1.5
name = "John"
is_active = True

# Conditionals
if x > y:
    print("x is greater than y")
elif x < y:
    print("x is less than y")
else:
    print("x is equal to y")

# For loop
for i in range(5):
    print(i)

# While loop
counter = 0
while counter < 5:
    print(counter)
    counter += 1

# Functions
def greet(name):
    print("Hello, " + name + "!")

greet("Alice")

# Lists
my_list = [1, 2, 3]
my_list.append(4)
my_list.remove(1)
print(my_list)

# Tuples
my_tuple = (1, 2, 3)

# Dictionaries
my_dict = {'a': 1, 'b': 2}
print(my_dict['a'])

# Modules
import math
print(math.sqrt(9))

# Error handling
try:
    print(10 / 0)
except ZeroDivisionError:
    print("Cannot divide by zero!")

# Classes
class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def introduce(self):
        print("My name is " + self.name + " and I am " + str(self.age) + " years old.")

person = Person("Bob", 30)
person.introduce()

# File I/O
with open("example.txt", "w") as file:
    file.write("This is an example.")

with open("example.txt", "r") as file:
    print(file.read())

# Working with os module
import os
print(os.listdir())