Functions, Logic, and Conditionals

Question 1

What is “def”

Answer 1

This command allows you to define a function

Question 2

What is a function made up of? How do they work?

Answer 2

A function has a header and a body. The header contains the function, the body contains the computations in the function. A function takes inputs, computes them as defined, and returns an output. Functions CAN contain (or “call”) other functions.

Eg. 
# converts fahrenheit to celsius
def fahrenheit2celsius(fahrenheit):
    celsius = (5.0 / 9) * (fahrenheit - 32)
    return celsius

Question 3

What is the most common error made in building a function, which will return a value of “None”

Answer 3

Forgot to include a “return” statement in the bottom of the function body.

Question 4

In the expression “6 + 7 % 5”, which operator is evaluated first (ie. which has higher precedence)?

Answer 4

% is evaluated first, so parentheses needed around anything it applies to.

Eg. (6 + 7) % 5

Question 5

What does the “import” statement do in Python?

Answer 5

“import” loads the functions of an external module for use.

Eg. import “math”

Question 6

Boolean Expressions NOT, AND, and OR. What makes each true?

Answer 6

All may be true or false.
NOT is true if x is false.
AND is true if x and y are true
OR is true if x or y is true

Question 7

Comparison operators? (six)

Answer 7

1. > greater than
2. < less than
   3, >= greater or equal to
3. <= less or equal to
4. == equal to
5. != not equal to

Question 8

Conditional statements? (Three)

Answer 8

"If" = If value is true, then perform this action
"Elif" = if the value is true but another condition is not met, then do perform a different action
"Else" = if value is false, then perform this action