Python Basics II

Question 1

How can you turn a list into a set?

Answer 1

With the set function, for example set([1,2,3,3]} will return {1,2,3}

Question 2

How do you add an element to a set?

Answer 2

Use the add method, for example, {1,2,3}.add(4) gives {1,2,3,4}

Question 3

What are the basic comparison operators?

Answer 3

> , <, ==, >=, <=, !=
For example
{1,1} == {1}
returns True

Question 4

How do you do negation (not equal)?

Answer 4

Precede with an exclamation point, for example, 1 != 2 returns true

Question 5

How are the “and” and “or” operators represented?

Answer 5

With the words and and or, for example,
1<2 and 2<3
Keep in mind Python is case-sensitive. If you write AND instead of and, you will get an error.

Question 6

What is the syntax for conditional logic (If, then, else)?

Answer 6

It uses colon and indent format. For example,
if 1==1:
print(‘they are equal’)
else:
print(‘they are not equal’)

Question 7

What is the syntax for multiple conditions

Answer 7

Use elif, for example,
if 1==12:
print(‘they are equal’)
elif 1<12:
print(‘middle’)
else:
print(‘they are not equal’)

Question 8

How do you get Python to perform multiple actions when the condition is true?

Answer 8

Just keep listing the actions in the indented block. You do not need a Begin-End block, such as in other languages. Esample:
if 1==1:
print(‘they are equal’)
print(‘this too’)
print(‘and this’)
elif 1<12:
print(‘middle’)
else:
print(‘they are not equal’)

Question 9

How do you name a variable embedded in a string?

Answer 9

By putting the variable name inside of the braces. For example,
‘This is var1 {x} and this is var2 {y}’.format(y=’World’, x=’Hello’)
Which returns,
‘This is var1 Hello and this is var2 World’

Question 10

Does the add method work for lists?

Answer 10

No, it only works for sets.