Quiz 2 Material

Question 1

creating a function

Answer 1

def name(parameters):
statements…
return something

Question 2

evaluate

Answer 2

turn an expression into a value

Question 3

argument

Answer 3

the value/expression we send to a function

Question 4

parameter

Answer 4

name we use for the variables in the function (you see them in the header) that are assigned to the arguments

Question 5

call

Answer 5

to use a function

Question 6

function definition

Answer 6

the code of the function (starts with “def”)

Question 7

return

Answer 7

exit the value we exited with

Question 8

side effect

Answer 8

actions that a function does (beyond returning something) that affect the environment outside of the function

Question 9

in a function, it is important to _____ a value instead of printing it

Answer 9

return

Question 10

def print_a_number(num):
print num

f1 = print_a_number(7)
print f1

Answer 10

7
none

Question 11

do values that only existed within a function still remain in the memory after the function call line was executed?

Answer 11

no, python removes the memory for the function and those values are gone

Question 12

scope

Answer 12

• the area where the variable is recognized (or has meaning)

Question 13

global variables

Answer 13

declared outside of a function
(have scope from where they are first created until the end of the program

Question 14

local variables

Answer 14

declared inside of a function
(have scope from where they are first created until the end of the function definition, this includes parameters)

Question 15

which variable will be used? -> if the variable name is on the left of an assignment operator, it doesn’t have a value yet and the global operator is not used

Answer 15

python treats it as a local variable

Question 16

if the variable is assumed to have a value already:
- if a local variable by that name exists, the _____ variable will be used
- if no local variable by that name exists, the _____ variable will be used

Answer 16

• local
• global

Question 17

you have to use the global keyword at the beginning of the function to ______ variables

Answer 17

modify

Question 18

default parameters

Answer 18

def my_function(a, b=15, c=’dog’)
b and c
- gives us the option of providing an argument for a certain parameter
- it we don’t provide an argument for that parameter, the function uses the default argument instead

Question 19

arguments: when you ___ a function
parameters: when you ___ a function

Answer 19

call
define

Question 20

which one is the positional argument and which one is the named argument?

my_function(a=10)
my_function(10)

do they do the same thing?

Answer 20

first one: named argument
second one: positional argument

yes

Question 21

libraries

Answer 21

groups of functions or pre-existing programs you can build from

Question 22

what is the syntax for importing random

Answer 22

import random

Question 23

what happens if we forgot to import and we use the a function within the library in our code?

Answer 23

there will be a name error that says that ‘—-‘ is not defined

Question 24

what is the syntax for choosing a random integer from 1 to 10 after you have imported random?

Answer 24

random.randint(1, 10)

Question 25

boolean

Answer 25

• bool
• used to denote “truth” and only has 2 possible values: True and False

Question 26

comparison operators

Answer 26

< > <= >= == !=

Question 27

boolean operators:

and: True when ___ of the things are true
or: True when ___ of the things are true
not: True when the expression is _____

Answer 27

• all
• any
• False

Question 28

operands for the logical operators (and, or, not) must be _______

Answer 28

booleans