CHAPTER 2

Question 1

Define functions.

Answer 1

it is a block of code that is intended to perform related or single operations. it also provides reusability of code and better modularity in application.

Question 2

call by reference

Answer 2

the original parameter may get updated in case any changes to this parameter are done inside the function

Question 3

function declaration

Answer 3

def fun_name([arguments]):
"optional documentation string"
statements

Question 4

calling a function

Answer 4

calling

it is the same as it is in other languages. it is done by the name of the function along with parameters.

ex: 
def multi(x,y):
    z=x*y
    print("multiplication is ", z)
return

multi(1512)
multi(210)

Question 5

scope of variables

Answer 5

it identifies the part of the program where the particular variable can be accessed.
following are the scope of variable in python:
1. global variables
2. local variables

Question 6

Recursive Functions

Answer 6

a function can make a call to another function.

when a function calls itself it is known as a recursive function.

Question 7

Modules

Answer 7

it is a file which contains python definition and statements.
the module name is the same as the file name without the suffix .py appended.