Sep 13: Quiz 1b, def Statements

Learning Objectives

After today's class, you should be able to:

• Write a function that performs a unit conversion (Ex: celsius to fahrenheit).

Reminders

• Read Ch 4 – ideally:
  • 1st half before Friday
  • 2nd half before Monday
• Submit HW 4 – ideally:
  • 1 and 2 before Friday
  • 3 and 4 before Monday

HW3 Debrief

[10 min]

Some highlights:

• Use else whenever possible, instead of extra elif
• Boolean values as variables, for flags and conditions
• Avoid doing the same conditions / logic multiple times

Quiz 1b

[25 min]

Instructions:

• Log in as student
• Only two windows:
  1. Thonny
  2. Web browser
• Web traffic monitored
• Log out when finished

Ch04 Preview

[15 min]

• Functions have parenthesis
  • Example from algebra: \(f(x) = 2x\)
  • \(f\) is a function, \(x\) is a variable, \(2x\) is the result
• Python keywords: def and return

  def double(number):
      return 2 * number
  

• Using descriptive names for functions/variables
• Added Docstring Requirements for Functions

"""Example unit conversion functions.

Author: Chris Mayfield
Version: 09/13/2023
"""


def c_to_f(celsius):
    """Convert celsius to fahrenheit.

    Args:
        celsius (float): degrees in celsius

    Returns:
        float: degrees in fahrenheit
    """
    return (celsius * 1.8) + 32


def f_to_c(fahrenheit):
    """Convert fahrenheit to celsius.

    Args:
        fahrenheit (float): degrees in fahrenheit

    Returns:
        float: degrees in celsius
    """
    return (fahrenheit - 32) / 1.8


if __name__ == "__main__":

    f = f_to_c(30)
    c = c_to_f(30)

    print(f"30 degrees F = {f:5.1f} degrees C")
    print(f"30 degrees C = {c:5.1f} degrees F")