Python

Question 1

What is the naming convention for class names in Python?

Answer 1

CapWords convention (PascalCase)

Question 2

Provide an example of a correctly named class in Python.

Answer 2

MyDog

Question 3

What should function names in Python be formatted as?

Answer 3

All lowercase with underscores separating words (snake_case)

Question 4

What is a proper name for a function that calculates force based on mass and acceleration?

Answer 4

calculate_force

Question 5

What rules should variable names follow in Python?

Answer 5

All lowercase with underscores separating words (snake_case)

Question 6

How many spaces should be used per indentation in Python?

Answer 6

4 spaces

Question 7

What is considered bad practice for indentation in Python?

Answer 7

Using 2 spaces per indentation

Question 8

What is preferred for indentation: spaces or tabs?

Answer 8

Spaces

Question 9

How should inline comments be formatted?

Answer 9

Separated by at least two spaces from the code and kept brief

Question 10

What is the syntax for block comments and inline comments?

Answer 10

my code  # inline comment

this is
# a block
# comment

Question 11

What is the Python script file extension?

Answer 11

.py

Question 12

How would you run a Python script using the command line?

Answer 12

python myscript.py

Question 13

What is the built-in function in Python for asking user input?

Answer 13

input()

The input() function takes in the user’s input, allowing interaction with the program.

Question 14

Which function is used to display output in Python?

Answer 14

print()

The print() function outputs data to the console.

Question 15

What is a formatted string literal in Python?

Answer 15

A string prefixed with ‘f’ that allows expressions inside curly braces.

Example: print(f’Very nice to meet you, {name}!’)

Question 16

What are the three main ways to print multiple objects?

Answer 16

Multiple arguments

print('Very nice to meet you, ', name, '!')

Concatenation

print('Very nice to meet you! My name is  ' + name, ' and I am  ' + age + '  years old')

Formatted String Literals

print(f'Very nice to meet you, {name}!')

Question 17

How do you declare a variable in Python?

Answer 17

name = ‘Grace’

This line of code stores the string ‘Grace’ in the variable name.

Question 18

What is casting in Python?

Answer 18

Specifying the type of a variable using built-in data types.

For example, using str() to convert a number to a string.

Question 19

How do you convert a numerical value to a string?

Answer 19

Using the function str().

For example, temperature = str(97.5) converts the number 97.5 to a string.

Question 20

What are some other built-in functions for type conversion in Python?

Answer 20

• int()
• float()
• bool()

These functions convert values to integer, float, and boolean types, respectively.

Question 21

How can you access the data type of a variable?

Answer 21

By using the built-in function type().

For example, type(temperature) will return the type of the variable temperature.

Question 22

Under what circumstances will the bool() function return False?

Answer 22

The argument is empty, 0, None, or False.

Question 23

What is the exponentiation operator?

Answer 23

**

Question 24

What is the floor division (integer division) operator?

Answer 24

//

Question 25

What are the three logical operators?

Answer 25

* and * or * not

Question 26

What are the three conditional statements?

Answer 26

* if * else * elif

Question 27

How would you iterate from 0 to 2 using a loop?

Answer 27

``` for i in range(3): ```

Question 28

How would you iterate over an array `nums`?

Answer 28

``` for num in nums: ```

Question 29

What does the keyword `pass` do?

Answer 29

The pass keyword is mostly used as a placeholder in a loop. Nothing gets executed when pass is placed under a condition.

Question 30

What are the three clauses used in error handling?

Answer 30

try, except, finally

Question 31

What does the keyword `finally` do?

Answer 31

Executes a block of code regardless of which error handling clause, `try` or `except`, was executed.

Question 32

What is the built-in keyword in Python that is used to declare functions.

Answer 32

`def`

Question 33

What indicates the start of a function body?

Answer 33

`:`

Question 34

What is the built-in keyword that exits the function and returns the output?

Answer 34

`return`

Question 35

Small, inline functions that can have any number of arguments but only one expression.

Answer 35

`lambda` functions

Question 36

Lambda functions in Python are also known as ___ functions.

Answer 36

anonymous

Question 37

The basic syntax of a lambda function is

Answer 37

`lambda` arguments : expression

Question 38

Called to delete an object.

Answer 38

destructors

Question 39

What is the syntax for a constructor?

Answer 39

`def __init__(self, `argument(s)`):`

Question 40

What is the syntax for defining a destructor in a class?

Answer 40

`def __del__(self):

Question 41

What is the syntax for using a destructor on an object?

Answer 41

`del my_object`

Question 42

What is the default access modifier for all members within a class?

Answer 42

public

Question 43

How to make a class member protected?

Answer 43

prepend one underscore

Question 44

How to make a class member private?

Answer 44

prepend two underscores

Question 45

What access modifier prevents members from being accessed outside of the class, unless it’s from a subclass.

Answer 45

protected

Question 46

What access modifier declares members to be accessible within the class only

Answer 46

private

Question 47

In Python inheritance, what two things must a child class contain?

Answer 47

* Name of the parent class in the definition of the child class * Constructor of the parent class called within the constructor of the child class

Question 48

In Python inheritance, what is the syntax for referencing the parent class in the definition of the child class?

Answer 48

`class Child(Parent):`

Question 49

How does polymorphism work in Python?

Answer 49

Just name methods the same between different classes.

Question 50

# Given the string `intro = "My name is Jeff!"` How would you index the letter "M"?

Answer 50

`intro[0]`

Question 51

# Given the string `intro = "My name is Jeff!"` How would you index the word `'My'`

Answer 51

`intro[0:2]`

Question 52

# Given the string `intro = "My name is Jeff!"` How would you index the word `'Jeff'`?

Answer 52

`intro[-5:-1]`

Question 53

How can you measure the length of a string?

Answer 53

`len()` ## Footnote e.g. `len(my_string)`

Question 54

What is the difference between Tuples and Lists?

Answer 54

Tuples are immutable | (can't be modified) ## Footnote Tuples are more memory efficient and slightly more time efficient than Lists

Question 55

What restriction is placed on Dictionary keys?

Answer 55

Must be immutable ## Footnote e.g. strings, numbers, or tuples

Question 56

How to check for Set containment?

Answer 56

`in` keyword ## Footnote e.g. `my_string in my_set`