Online Python course: from your first program to classes and objects

• Installing Python 3 and running your first script
• Trying ideas in the interactive shell
• print(), input() and comments
• How Python uses indentation to group code

print("Hello, " + input("Your name? "))

• Integers, floats, strings and booleans
• Converting types with int(), float() and str()
• String methods and f-strings
• Arithmetic, integer division (//) and remainder (%)

price = float("12.5"); print(f"{price * 2:.2f}")

• if, elif and else
• Comparison and logical operators: and, or, not
• while loops, and for loops with range()
• break, continue, counters and running totals

for n in range(1, 11): print(n, n * n)

• Defining functions with def
• Parameters, default values and return values
• Local and global scope
• Using modules such as math and random
• Splitting a program into small functions you can test

def area(r): return 3.14159 * r ** 2

• Lists: indexing, slicing, append and sort
• Tuples, and when a value should not change
• Dictionaries for looking things up by key
• Sets for unique values
• List comprehensions

marks = {"Ali": 72, "Sara": 91}; print(max(marks.values()))

• Classes, objects and __init__
• Attributes, methods and self
• Inheritance and overriding methods
• Special methods such as __str__

class Dog(Animal): pass

• Reading a traceback from the last line up
• try, except, else and finally
• Common exceptions: ValueError, KeyError, ZeroDivisionError
• Raising your own exceptions
• Reading and writing text files with with open()

with open("marks.txt") as f: lines = f.readlines()