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0.0-python-intro.md

Python Intro

An introductory course to Python programming

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1-hello-world.py
print("What's good, world?")
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2. variables.py
my_name = "Mr. Brother Man"
my_age = 42
my_interests = ["Anime", "Archery", "Skating"]
print("My name is", my_name, "and I am", my_age, "and my interests are", *my_interests)
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2.1-variables-alternate-way.py
message = f"My name is {my_name} and I am {my_age} and my interests are {my_interests[0]}, {my_interests[1]}, and {my_interests[2]}"
print(message)
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2.2-vriables-explanation.md

my_name is a string. It is used for things like names, and natural language
my_age is an integer. It is used for whole numbers, both negative and positive
my_interests is a list. It is used for grouping/ordering related variables

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3. collecting-input.py
input("What is your name: ")
name = input("What is your name: ")
print(name)
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4. class-exercise.md

Class Excersie 1

Use what you've learnt so far to construct an app that can work for everyone.

The idea here is to collect a person's name, age, and interests, store them in a variable, then print them in the end.

Starting point

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4.1-starting-point.py
name = input("What is your name: ")
age = input("What")
interest1 = input("What is your number 1 interest: ")
interest2 = input("What is ")
interest3 = input("What ")
combined = f"Your name is {name} and"
print(combined)
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5. loops intro.md

Notice how you needed to define interest1, interest2, and interest3 manually? What if there was a way to write less code? That is where a for-loop comes in.

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5.1-loops-intro.py
name = input("What is your name: ")
age = input("What is your age: ")
interests = []
for i in range(3):
interest = input(f"What is your number {i} interest: ")
interests.append(interest)
interests_string = ", ".join(interests)
combined = f"Your name is {name} and you are {age} years old with interests in {interests_string}"
print(combined)
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5.2-parts-of-a-loop.md

Parts of a loop

  1. increment variable
  2. iterator/iteration
  3. repeated code

In the previous loop, i is the increment variable,
range(3) is the iterator and the snippet below is the repeated code

  interest = input(f"What is your number {i} interest: ")
  interests.append(interest)
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5.3-while-loop.py
name = input("What is your name: ")
age = input("What is your age: ")
interests = []
i = 1 # increment variable
while i <= 3: #
interest = input(f"What is your number {i} interest: ")
interests.append(interest)
i += 1 # iteration
interests_string = ", ".join(interests)
combined = f"Your name is {name} and you are {age} years old with interests in {interests_string}"
print(combined)
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6.0-functions-intro.md

Functions Intro

Functions allow you to group logic. So the input collector you’ve built so far can be stored as a function that can be called anytime.

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6.1-your-first-function.py
def collect_input():
name = input("What is your name: ")
age = input("What is your age: ")
interests = []
for i in range(3):
interest = input(f"What is your number {i} interest: ")
interests.append(interest)
interests_string = ", ".join(interests)
return f"Your name is {name} and you are {age} years old with interests in {interests_string}"
collect_input()
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6.2-a-simpler-function.py
def add(num1, num2):
return num1 + num2
number_sum = add(2, 3)
print(number_sum)
'''
num1 is the first parameter
num2 is the second parameter
2 is the first argument (things passed to functions)
3 is the second argument
return is a keyword for returning from a function
'''
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6.3-subtract-function.py
def subtract(num1, num2):
return num1 - num2
difference = subtract(7, 3)
print(difference)
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6.4-divide-function.py
def divide(num1, num2):
return num1/num2
print("5 divide by 2 is", divide(5,2), "\n\n")
print("3 divide by 0 is", divide(3, 0)) # throws error
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6.5-preventing-your-code-from-breaking.py
def divide(num1, num2):
try:
return num1/num2
except Exception as e:
print(str(e))
print("5 divide by 2 is", divide(5,2))
print("3 divide by 0 is", divide(3, 0)) # throws error
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6.6-specific-way-to-catch-exceptions.py
def divide(num1, num2):
try:
return num1/num2
except ZeroDivisionError:
print("You attempted to divide by zero")
print("5 divide by 2 is", divide(5,2))
print("3 divide by 0 is", divide(3, 0)) # throws error
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6.x-using-external-libraries.md

Using External Libraries

Python allows you to connect to websites, databases, robots, etc. Most of this functionality is stored in external libraries.

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7.0-classes.md

Python Classes

A Class is a more advanced way to group several functions and related logic in one place

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7.1-classes-intro.py
class Calculator:
def __init__(self):
pass
def add(self):
name = input("What is your name: ")
age = input("What is your age: ")
interests = []
for i in range(3):
interest = input(f"What is your number {i} interest: ")
interests.append(interest)
interests_string = ", ".join(interests)
return f"Your name is {name} and you are {age} years old with interests in {interests_string}"
bank = Bank()
bank.collect_input()
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