Question 1

Which of the following statements about Python data types is correct?

Accepted Answer

Sets are collections of unique, unordered elements.

Question 2

Given the following code, what will be the output?

x = 2
print(isinstance(x, int))

Accepted Answer

True

Question 3

Which control structure would be most appropriate for repeatedly checking if a user has entered a valid password?

Accepted Answer

Repetition structure

Question 4

Consider the following condition:

$$	ext{not}((	ext{temperature} \geq 80) 	ext{ and } (	ext{humidity} \leq 60))$$

Which of the following is an equivalent condition according to De Morgan's Laws?

Accepted Answer

$$(	ext{temperature}  60)$$

Question 5

What is the result of the following comparison?

"Dog" \u003c "dog"

Accepted Answer

True, because uppercase letters come before lowercase letters in ASCII.

Question 6

Which of the following statements about the sort() method in Python is correct?

Accepted Answer

The sort() method sorts the list in place and returns None.

Question 7

Given the following code:

lst = [21, "6", 9, "d"]
lst.sort()

What will happen when this code is executed?

Accepted Answer

A TypeError will be raised because the list contains both strings and integers.

Question 8

Which of the following best describes short-circuit evaluation in Python?

Accepted Answer

Python stops evaluating further conditions if the result is already determined by the first condition.

Question 9

Suppose you want to check if a string variable 'state' is equal to one of several state abbreviations ('MD', 'VA', 'WY', 'CA'). Which of the following is the most Pythonic way to write this condition?

Accepted Answer

state in ['MD', 'VA', 'WY', 'CA']

Question 10

What is the result of the following condition?

"fun" in "refunded"

Accepted Answer

False, because 'fun' is not a substring of 'refunded'.

Question 11

Which of the following is a valid use of relational operators in Python?

Accepted Answer

$$3.5 \u003c 3.7$$

Question 12

Which logical operator would you use to check if BOTH conditions are true in a compound statement?

Accepted Answer

and

Question 13

Given the following code:

word = "Apple"
print(word.startswith("A"))

What will be printed?

Accepted Answer

True

Question 14

Which of the following is NOT a valid Python data type?

Accepted Answer

sequence

Question 15

What is the result of the following condition?

$$1 \u003c 1$$

Accepted Answer

False

Question 16

Which of the following statements about ASCII values and string comparison is correct?

Accepted Answer

Digits (0-9) have lower ASCII values than all letters.

Question 17

Which of the following expressions will evaluate to True?

n = 4
answ = "Y"
(n == 4) and (answ == "Y")

Accepted Answer

True

Question 18

Which of the following is a common error when writing conditions in Python?

Accepted Answer

Using a single equal sign in a condition instead of a double equal sign.

Question 19

Which of the following methods returns True if all characters in a string are digits?

Accepted Answer

isdigit()

Question 20

Suppose you want to check if a variable x is between 10 and 20, inclusive. Which of the following is the most concise way to write this condition in Python?

Accepted Answer

10 \u003c x \u003c= 20

Python Data Types, Control Structures, and Operators: Study Notes

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