Question

1. When creating your own functions, which of the following are good characteristics that make them robust, sharable, and reusable (check all that apply)

		the function's name is suggestive of its purpose and/or actions and includes a summary docstring
		the function freely uses variables in the global namespace to perform its activities
		the function only uses variables it is passed by calling code or it otherwise internally creates
		the function only performs a limited number of actions

2. Following list is given.

L L = [20, ‘Hello’, ‘Hi’, 6, 9]

What is the type of L[-3] = ?

		int
		float
		string
		list

3. Functions are required to have the following number of parameters and return statements (check all that apply):

		at least one parameter and one return statement
		zero or more parameters and zero or more return statements
		one parameter but zero or more return statements
		one return statement but zero or more parameters

4. To repeat a code fixed number of times what should you use?

		while loop
		repeat loop
		for loop
		conditional structure

5. What is the value of 'total' at the end of the code?

total = 0 numbers = [11, 1, -1, -20, 15] for number in numbers: total += number

		Raise an error
		10
		6
		16

Answer 1

Ans 1) Some good characterstics of user defined functions are:

• Option (a) : the function's name should be suggestive of its purpose and/or actions which helps in better readability of code
• Option (b) : The global variables should be avoided in good coding practices but it can be used if necessary.
• Option (c): The functions should use the variables passed as arguments or should create its own variables as it helps in sharing and reusability of the code easily.
• Option (d) : The function should perform limited number of actions as it helps to keep the code modular with different functions for different actions and hence better reusability of code. Because there may be case when only some part of function is needed for another code and hence modular functions help in these cases.

Ans 2) L = [20, ‘Hello’, ‘Hi’, 6, 9]

L[-3] will give the item from the list which is at 3rd position from last in the list due to '-'(negative) sign. So, the third item from last in the given list is 'Hi' which is a string.

Hence, option (c) string is correct.

Ans 3) Functions are required to have the following number of parameters and return statements.

Option (b) zero or more parameters and zero or more return statement is correct.

The arguments are not necessary in the functions and hence there can be 0 or more arguments in the function.

Also, the return statements depends on the type of the function (void, int, string, boolean etc). In void function, there should be 0 return statement, in other types, there should be 1 or more return statements.

Ans 4) To repeat a code fixed number of times what should you use?

We can use any loop type of code for repeating the statements in the code. For eg, do while, for loop, while loop, repeat loop etc.

So, option (a), (b), and (c) are correct.

Option (d) is wrong because the conditional structure consists of if-else statments and hence not used for repeatation of code.

Ans 5) What is the value of 'total' at the end of the code?

 total = 0

 numbers = [11, 1, -1, -20, 15]

 for number in numbers: 

    total += number

Option (c) 6 is correct.

It will add all the elements in the 'numbers' list given in the code. So the value of total will be 6.