Chapter 7: Functions and Modules

Question 1

What is the syntax for defining your own function?

Answer 1

def functionName(list of parameters): 
       code detailing what the function should do 
      return [expression]

Question 2

Explain the syntax

Answer 2

def tells the program that indented code from next line onwards is part of the program. Return is the keyword used to return an answer from the function.

Question 3

Can there be more than 1 return statement in a function?

Answer 3

Yes

Question 4

What happens once the function executes a return statement?

Answer 4

It exits

Question 5

What to do if the function need not return any value?

Answer 5

We can omit the return statement. Alternatively, we can write return or return none.

Question 6

Write the script for defining a function.

Answer 6

Question 7

What happens if the local variable shares the same name as the global variable?

Answer 7

Any code inside the function is accessing the local variable. Any code outside the function is accessing the global variable.

Question 8

Write a script with the result showing the last flashcard

Answer 8

Result:

INSIDE THE FUNCTION
Local variable(shares the same name as a global variable)

OUTSIDE THE FUNCTION
Global variable(shares same name as a local variable)

Question 9

What does Python allowing a default value mean?

Answer 9

This means that Python allows to assign default values to the parameters when defining a function

Question 10

Give an example for defining the default parameters

Answer 10

def someFunction(a,b,c=1,d=2,e=3):
print(a,b,c,d,e)

Question 11

What are salient features to remember when assigning default parameters?

Answer 11

1) All parameters with default values must be placed at the end of the parameters list.

Question 12

How does Python allow us to pass a variable number of arguments to a function?

Answer 12

By using the *(asterisk) before the parameter

Question 13

Give an example of variable length argument

Answer 13

Question 14

When we add an asterisk in front of a parameter name, we can pass in a variable number of arguments to the function. This is known as a ________variable length argument list.

Answer 14

non-keyworded

Question 15

If we want to pass in a keyworded variable length argument list to the function, we can use _______

Answer 15

double asterisks

Question 16

Write a script defining a function with double asterisks

Answer 16

Question 17

If our function uses a normal argument (also known as a formal argument), a non-keyworded variable length argument list and a keyworded variable length argument list, we must define the function using the following order:

Answer 17

def someFunction2(farg,*args, **kwargs):

Question 18

What is the first way to import the entire module?

Answer 18

by writing
importmoduleName

for example import random

Question 19

How would you use the randrange() function in the random module?

Answer 19

We write random.range(1,10)

Question 20

What is the third way to import modules?

Answer 20

To import specific functions

Question 21

How can you import specific functions?

Answer 21

By writing

moduleName import name1 [,name2[,…nameN]]

Question 22

What would you write to import the randrange() function from the random module?

Answer 22

from random import randrange

Question 23

What if we want to import more than 1 function?

Answer 23

We separate them with a comma.
For example,
from random import randrange, randint

and then just write

randrange(1,10)

Question 24

What if you find it troublesome to write random each time you use the function?

Answer 24

you simply write r.randrange(1,10)

Question 25

Why should you create your own module?

Answer 25

If you want to reuse them in other programming projects in future

Question 26

How would you use the checkIfPrime() function defined earlier in another script?

Answer 26

Save the script with this function in the same folder as the another script which you are using to call on this function. The other script is called usecheckifprime.py