Control Flow

Question 1

This is the order in which individual statements, instructions or function calls of an imperative program are executed or evaluated.

Answer 1

Control Flow.

Question 2

Define iterate (verb).

Answer 2

To perfrom or utter repeatedly.

Question 3

Com. Sci. Defintion of Iteration.

Answer 3

The repetition of a function or process in a computer program. We can use loops to execute a block of code for every iteration.

Question 4

What is the purpose of the enumerate function?

Answer 4

A lot of times when dealing with iterators, we also get a need to keep a count of iterations. Python eases the programmers’ task by providing a built-in function enumerate() for this task.
Enumerate() method adds a counter to an iterable and returns it in a form of enumerate object. This enumerate object can then be used directly in for loops or be converted into a list of tuples using list() method.

Question 5

Say you have a list of tuples, what technique would you use to unpack the elements of the tuples?

Answer 5

Tuple unpacking.

Question 6

Consider mylist = [(1,2),(3,4),(5,6)], use tuple unpacking to print out the elements of the tuple.

Answer 6

for a,b in mylist:

print(a)

print(b)

Question 7

This statement allows the for loop to run with no error from python. Without it, python will yell error. This is very useful for functions.

Answer 7

The pass statement.

Question 8

This statement allows us to go back to the closest enclosing loop.

Answer 8

The continue statement.

Question 9

This statement breaks the loop and very useful for while loops.

Answer 9

The break statement.

Question 10

What is another way of saying x = x + 1 in python?

Answer 10

x += 1

Question 11

This operator is a generator. It generates information instead of saving it.

Answer 11

The range operator.

Question 12

How would you put a range of numbers into a list?

Answer 12

x = list(range(start,stop,step size))

Question 13

This is a very common operator in python, it is used to add a counter to a iterable results in a tuple. Useful for strings.

Answer 13

The enumerate function.

Question 14

Kinda opposite to the enumerate operator, this operator attaches elements of differents lists together.

Answer 14

The zip operator.

Question 15

A quick way of checking if an item is in a list we would use what keyword?

Answer 15

-in

ex.

>> ‘x’ in [1,2,3]

<< False

Question 16

If you would want the smallest/biggest values in your lists, what keyword would you use?

Answer 16

smallest –> min()

biggest –> max()

Question 17

What would be the line of code you would use to randomly rearrange elements?

Answer 17

from random import shuffle.

Question 18

True/False: The shuffle command shuffles in place not returning anything so we cannot save it to a variable.

Answer 18

True.

Question 19

What line of code would you use to grab a random integer between 0 & 100?

Answer 19

randiant(0,100)

This returns an output so we can save it to a variable.

Question 20

What data type does the input function return?

>> result = input(‘Enter a number here: ‘)

>> type(result)

<< ????

Answer 20

string.

To change, use int(result) or float(result).

Question 21

These are a unique way of quickly creating a list iwth python. If you find yourself using a for loop along with .append() to creat a lis, then this is an alternative!

Answer 21

List comprehensions.

Question 22

Order is different/same for if-else statements in list comprehensions as if statements.

Answer 22

different.