Decomposition part 3

Question 1

Write a function called “emphasize” that takes a string as a parameter. This function returns a modified version of the string:
- !!! will be added onto the end

Answer 1

Question 2

Creating variables all at once at the start of a function

Answer 2

• Stylistic Note, not syntactically required but a stylistic approach

Question 3

idenitifers (constants or variables) that are declared within the bidt of a function have a ——

Answer 3

local scope (the function)

Question 4

identifiers (constants or variables) that are created outside the body of a function have a —–

Answer 4

global scope (the program)
- to the end of the start() call

Question 5

Tell me the output of this program:

num1 = 10

def fun():
   print(num1)

def start():
   fun()
   print(num2)

num2 = 20

start()

Answer 5

10
20

Question 6

When a variable is declared outside of a funtion, it becomes a

Answer 6

global variable

Question 7

You can acess the contents of global variables anywhere in the program, in python, this can occur

Answer 7

even if the “global” keyword is not used

Question 8

Why is the use of glonal variables bad programming style

Answer 8

they can be accidentally modified anywhere in the program

Question 9

Difference between global variables and global constants:

Answer 9

global constants: used for values that remain constant
global variables: used for data that can be modififed during execution

Question 10

Whats the output?

num = 1

def fun():
   num = 2
   print(num)

def start():
   print(num)
   fun()
   print(num)

start()

Answer 10

1
2
1

Question 11

passing variables does not…..

Answer 11

overwrite local variables

Question 12

If you want to modify the value of a global variable from within the function, it will…. +ex (2)

Answer 12

not change it, just creates a local variable
ex:
~~~
name = 5 #global name
def fun():
name = 2 #local name
~~~

Question 13

if you want to modify global variables from within the function, you need to

Answer 13

use the global keyword.
Prefacing the name of a variable with the keyword global in a function will indicate changes in the funtiuon will refer to the global variable rather than creating a local one
~~~
global <variable>
~~~</variable>

Question 14

Tell me the output:
~~~
num = 1

def fun():
global num
num = 2
print(num)

def start():
print(num)
fun()
print(num)

start()
~~~

Answer 14

1
2
2

Question 15

Boolean functions +ex (3)

Answer 15

• Return a Bolean value (T/F)
• Typically the Boolean function will ask the question about a parameter(s):
• ex: is it true that the string can be converted to a number? (def isNum(aString):)

Question 16

Write me a Boolean function that: sees if the the entered value is a number before proceeding

Answer 16

Question 17

Decompose this long function fo rme

Answer 17

Question 18

function definition needs to be —— the —–

Answer 18

before
function call

Question 19

with python, the missing set of brackets in a function call do not produce a (2)

Answer 19

syntax/translation error

Question 20

When creating empty functions…

Answer 20

it cannot be fully empty, a function must have at least one instruction in the body.
- ex: add “print()”