Week 3 Chapter 3 Functions

Question 1

What happens when you define a function?

Answer 1

Specifying the name and the sequence of statements

Question 2

When a function is called what is the value in parentheses usually called?

Answer 2

Usually called the argument

Question 3

What is the official name for a result of a function?

Answer 3

Return value

Question 4

When int converts floating-point values to integers, what does it do?

Answer 4

It take the fraction part away and returns value like that

Question 5

What would 3.9 look like when converted to integer?

Answer 5

3

Question 6

What data types can float convert?

Answer 6

Strings and floating point numbers

Question 7

What is a module?

Answer 7

File that contains a collection of related functions

Question 8

Before we can use a module what do we have to do?

Answer 8

Have to import said module

Question 9

What does dot notation format look like?

Answer 9

Math.log(23)

Question 10

What is one of the most useful things about programming?

Answer 10

Ability to take small building blocks and compose them.

Question 11

Where can you not put a arbitrary expression?

Answer 11

On the left side of an assignment value

Question 12

The left side of an assignment statement has to have what?

Answer 12

A variable name

Question 13

What does a function definition do?

Answer 13

It specifies the name of a new function and the sequence of statements that execute when the function is called.

Question 14

What are the rules for function names?

Answer 14

Can’t have keywords, illegal characters, and the start has to be a letter not a number.

Question 15

What should you avoid with function names?

Answer 15

Having a variable and a function with the same name

Question 16

What do empty parentheses after a function name indicate?

Answer 16

That it doesn’t take any arguments

Question 17

What is the first line of a function definition called?

Answer 17

A header

Question 18

What is the other part of a function definition called (besides header)?

Answer 18

The body

Question 19

The header has to end with what, in a function definition?

Answer 19

Colon :

Question 20

Does the body in a function definition have to be indented?

How many spaces if in indented?

Answer 20

Yes it does, with 4 spaces in each line

Question 21

What is a function?

Answer 21

Named sequence of statements that perform a computation

Question 22

Can functions be used to repeat tasks that don’t return values?

Answer 22

Yes

Question 23

When is a return optional in a function?

Answer 23

When the function doesn’t need to send back a value.

Question 24

When a function is done running what happens to the local variables in the function?

Answer 24

They cease to exist

Question 25

What happens to local variables when a function exists

Answer 25

They are deleted

Question 26

When a global variable is accessed in a function where is it coming from?

Answer 26

From outside the function

Question 27

Functions allow local variables that are ______ and can hide ________

Answer 27

Functions allow local variables that exist only inside the function and can hide other variables that are outside the function

Question 28

When you define a variable in the global scope, where can you use it?

Answer 28

Inside and outside of functions. Local and outside

Question 29

When a variable is made in a function (local scope) can you call it in the global scope?

Answer 29

No you cannot

Question 30

How do I get info about a module

Answer 30

Use print command in Python

Question 31

In a function definition what is def and what does it do?

Answer 31

Def is a keyword that signals that this is going to be a function definition

Question 32

Once you have defined a function can you use it in another function?

Answer 32

Yes you can

Question 33

What is the flow of execution?

Answer 33

That execution begins at the first statement of a program. Then it flows from top to bottom one at a time.

Question 34

When are statements in a function executed?

Answer 34

When it is called.

Question 35

What is a parameter?

Answer 35

Name used inside a function to refer to the value passed as an argument

Question 36

Are parameters in a function also local?

Answer 36

Yes

Question 37

When you create a variable outside of a function what is the function name it belongs to?

Answer 37

main

Question 38

If an error occurs with functions what does Python do?

Answer 38

Prints name of function and name of function that called it

Question 39

In a Python error message what is the list of functions called?

Answer 39

Trace back

Question 40

What do fruitful functions do?

Answer 40

Yield a result

Question 41

What do void functions do?

Answer 41

They will display something but have the none data type even if you assign them to a variable.

Question 42

What are two ways to import modules?

Answer 42

Use import and from to import a specific object

Question 43

What happens when I do this from math import *

Answer 43

Imports everything from math module

Question 44

Advantage of importing everything from a module?

Answer 44

Code can be more concise

Question 45

Disadvantage of importing everything from a module?

Answer 45

Might be conflicts between names defined in different modules or with variable name you defined with module variable name.

Question 46

If a recursion never a reaches a base what is it called?

Answer 46

An infinite recursion but really it isn’t infinite

Question 47

In Python 2 what is input()

Answer 47

Raw_input()