Python #2

Python Basics

100

What are the four most common data types?

String, Int, Boolean, Float

200

What keyword is used to check a condition?

"if"

300

What does this return?
5 > 2 and 3 < 1

False

400

Name 3 boolean comparison operators

==, !=, >=, <, <=, >

500

What built-in function do you use to get the data type of a variable?

type()

Lists and Tuples

100

What’s the difference between a list and a tuple?

Lists are mutable, tuples are not.

200

Write a list with three fruits

["apple", "banana", "cherry"]

300

How do you access the first element in a list called items?

items[0]

400

What does this code print?
nums = [1, 2, 3]
nums[1] = 5
print(nums)

[1, 5, 3]

500

DAILY DOUBLE: What will this print?
nums = [10, 20, 30]
nums.insert(1, 15)
nums.pop()
print(nums)

[10, 15, 20]
Inserts 15 at index 1 -- in between 10 and 20.
pop() will remove the last element(30)

Functions

100

What keyword starts a function definition in Python?

"def"

200

What is a parameter?

A variable used inside a function to accept input

300

What will this function return?
def mystery(x):
if x % 2 == 0: return x // 2
else: return x * 3
mystery(4)

2

400

What does this code print and why?
def f(x): x += 1
return x
y = 5
f(y)
print(y)

5 (integers are immutable; x is a copy) 

500

What does this return?
def func(x):
if x > 0: return x + func(x - 1)
else: return 0
print(func(2))

3 --- (2+1+0)

Classes and Objects

100

What is the purpose of the init() function in a class?

Initializes new object and its attributes.

200

In this line, which is the class and which is the object? player1 = Gamer("Alex")

Gamer is class; player1 is object.

300

What does this print?
class Cat:
def __init__(self, name): self.name = name
c = Cat("Luna")
print(c.name)

"Luna"

400

Write a method inside a class that returns the square of an attribute called side.

def area(self):
return self.side ** 2

500

Create a class Rectangle that stores width and height and has a method area() returning the area.

class Rectangle:
self.width = width
self.height = height
def area(self): return self.width * self.height

What's Wrong With This Code?

100

my_list = [1, 2, 3]; my_list.pop(3)

Index 3 out of range (valid 0–2).

200

print("My age is " + 15)

Can't concatenate str and int.

300

numbers = [1, 2, 3]
numbers.append = 4

You’re trying to assign a value to append, which is a built-in method.

400

x = input("Enter a number: ")
if x > 10:
    print("Big number!")

input() returns a string, so comparing it to an integer causes an error.

500

count = 0
def increase():
    count += 1
    print(count)
increase()

count cannot be accessed within the function, it has not been defined locally.
use global count to do so