Return multiple results

def find_capital():
  f_name = input("What is the first name?")
  l_name = input("What is the last name?")
  return f_name[0],l_name[0]

names = find_capital()
print(f"First Capital is {names[0]}")
print(f"Second Capital is {names[1]}")

10.1 Leap Year Return

---

def is_leap(year):
  if year % 4 == 0:
    if year % 100 == 0:
      if year % 400 == 0:
        return "Leap year."
      else:
        return "Not leap year."
    else:
      return "Leap year."
  else:
    return "Not leap year."

def days_in_month(input_year, input_month):
  month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]  
  is_leap_year = is_leap(input_year)
  if is_leap_year == "Leap year.":
    month_days[1] = 29
  days = month_days[input_month-1]
  return days
  
  
  
#🚨 Do NOT change any of the code below 
year = int(input("Enter a year: "))
month = int(input("Enter a month: "))
days = days_in_month(year, month)
print(days)

Docstrings

---

Use 3 quotes around the string

def is_leap(year):
  """ Returns whether this is a leap year or not """
  if year % 4 == 0:
    if year % 100 == 0:
      if year % 400 == 0:
        return "Leap year."
      else:
        return "Not leap year."
    else:
      return "Leap year."
  else:
    return "Not leap year."

# Writing is_leap( without the closing parenthesis should give you the docstring.

Another quick return example

---

def add(n1, n2):
  return n1 + n2
 
def subtract(n1, n2):
  return n1 - n2
 
def multiply(n1, n2):
  return n1 * n2
 
def divide(n1, n2):
  return n1 / n2
 
print(add(2, multiply(5, divide(8, 4))))

Don't use Returns before needed code

---

Returns will skip the rest of the code and return nothing or whatever it returns

# output of this is nothing, you'd think it might return "Terrible" since 25 < 40 but it dies at the return statement. 
def my_function(a):
    if a < 40:
        return
        print("Terrible")
    if a < 80:
        return "Pass"
    else:
        return "Great"
print(my_function(25))

The Calculator

---

Print vs Return

---

Why do we return instead of print? Reusability. If we have a function that returns the sum, we can then use that return to keep going. If we print it, it's pretty much final and not saved.

Art.py

---

The logo. You can change it to do what you want to say, but I added my name to it :)

logo = """
 _____________________
|  _________________  |
|      Solomon   0. | |  .----------------.  .----------------.  .----------------.  .----------------. 
| |_________________| | | .--------------. || .--------------. || .--------------. || .--------------. |
|  ___ ___ ___   ___  | | |     ______   | || |      __      | || |   _____      | || |     ______   | |
| | 7 | 8 | 9 | | + | | | |   .' ___  |  | || |     /  \     | || |  |_   _|     | || |   .' ___  |  | |
| |___|___|___| |___| | | |  / .'   \_|  | || |    / /\ \    | || |    | |       | || |  / .'   \_|  | |
| | 4 | 5 | 6 | | - | | | |  | |         | || |   / ____ \   | || |    | |   _   | || |  | |         | |
| |___|___|___| |___| | | |  \ `.___.'\  | || | _/ /    \ \_ | || |   _| |__/ |  | || |  \ `.___.'\  | |
| | 1 | 2 | 3 | | x | | | |   `._____.'  | || ||____|  |____|| || |  |________|  | || |   `._____.'  | |
| |___|___|___| |___| | | |              | || |              | || |              | || |              | |
| | . | 0 | = | | / | | | '--------------' || '--------------' || '--------------' || '--------------' |
| |___|___|___| |___| |  '----------------'  '----------------'  '----------------'  '----------------' 
|_____________________|
"""

main.py

---

from replit import clear
from art import logo

def add(n1, n2):
  return n1 + n2

def subtract(n1, n2):
  return n1 - n2

def multiply(n1, n2):
  return n1 * n2

def divide(n1, n2):
  return n1 / n2

operations = {
  "+": add,
  "-": subtract,
  "*": multiply,
  "/": divide
}

def calculator():
  print(logo)

  num1 = float(input("What's the first number?: "))
  for symbol in operations:
    print(symbol)
  should_continue = True
 
  while should_continue:
    operation_symbol = input("Pick an operation: ")
    num2 = float(input("What's the next number?: "))
    calculation_function = operations[operation_symbol]
    answer = calculation_function(num1, num2)
    print(f"{num1} {operation_symbol} {num2} = {answer}")

    if input(f"Type 'y' to continue calculating with {answer}, or type 'n' to start a new calculation: ") == 'y':
      num1 = answer
    else:
      should_continue = False
      clear()
      calculator()

calculator()