python quiz

Question 1

Which one is NOT a legal variable name?

Myvar
my_var
my-var
_myvar

Answer 1

my-var

Question 2

How do you create a variable with the numeric value 5?

Both the other answers are correct
x = 5
x = int(5)

Answer 2

Both the other answers are correct

Question 3

What is a correct syntax to return the first character in a string?

x = “Hello”.sub(0, 1)
x = “Hello”[0]
x = sub(“Hello”, 0, 1)

Answer 3

x = “Hello”[0]

Question 4

Which method can be used to remove any whitespace from both the beginning and the end of a string?

trim()
ptrim()
len()
strip()

Answer 4

strip()

Question 5

Which method can be used to replace parts of a string?

switch()
replace()
replaceString()
repl()

Answer 5

replace()

Question 6

Which collection does not allow duplicate members?

TUPLE
SET
LIST

Answer 6

SET

Question 7

How do you start writing a while loop in Python?

while x > y {
while (x > y)
x > y while {
while x > y:

Answer 7

while x > y:

Question 8

for x in y:
for each x in y:
for x > y:

Answer 8

for x in y:

Question 9

Consider the following function definition:

def hello_name(name: str) -> str:
return f”Hello {name}”
What does the -> str part of the function definition indicate?

Answer 9

The function is expected to return a string.

Question 10

Where are docstrings stored within a Python object?

Answer 10

In the .__doc__ property

Question 11

What are the three major categories of docstrings in Python?

Answer 11

Class, method, and function docstrings
Package and module docstrings
Script docstrings

Question 12

What are the recommended parts to include in the documentation of a private project?

Answer 12

A README and an examples.py file

Question 13

What’s a good approach to structuring the docs/ folder of a public or open-source Python project?

Answer 13

Tutorials
How-To Guides
References
Explanations

Question 14

How would you express the hexadecimal value a5 as a base-16 integer constant in Python?

Answer 14

0xa5

Question 15

How would you express the constant floating-point value 3.2 × 10-12 in Python:

Answer 15

3.2e-12

Question 16

Which of the following are valid ways to specify the string literal foo’bar in Python:

Answer 16

”"”foo’bar”””
‘foo'bar’
“foo’bar”

Question 17

Which of the following is not a Python built-in function:

diff()

repr()

isinstance()

round()

map()

Answer 17

diff()

Question 18

What’s the primary purpose of decorators in Python?

Answer 18

To modify the behavior of a function

Question 19

In Python, what does it mean that functions are considered first-class objects?

Answer 19

You can pass functions around and use them as arguments.
You can treat functions like any other object.
You can assign functions to variables.

Question 20

Which of the following statements about functions in Python is true?

Answer 20

Functions in Python may have side effects.
The print() function is an example of a function with side effects.

Functions in Python may have side effects, meaning they can perform actions other than just returning a value based on the given arguments. The print() function is an example of a function with side effects, as it outputs something to the console while returning None.

Question 21

What are the characteristics of inner functions in Python?

Answer 21

-Python only defines them when you call the parent function.
-You define them inside other functions.
-They’re locally scoped to the parent function.

Inner functions are defined inside other functions and are locally scoped to the parent function. This means they only exist inside the parent function as local variables, and you can’t access them outside the parent function.

The order in which you define them doesn’t affect their execution. They only get defined when you call their parent function.

If you want to diver deeper, then you can read more about what inner functions are good for.

Question 22

def reference():
def inner():
return 42
return inner

def evaluation():
def inner():
return 42
return inner()

referenced = reference()
evaluated = evaluation()
Which statements about the the variables referenced and evaluated are true?

Answer 22

The variable evaluated will be the integer 42.

The variable referenced will be a reference to a function object.

Question 23

What’s the purpose of the @ symbol when using decorators?

Answer 23

It simplifies applying a decorator to a function.

Question 24

You’ve decorated a function that accepts an argument, but when running it, you get an error:

TypeError: wrapper() takes 0 positional arguments but 1 was given
What might be a good approach to try to fix this error?

Answer 24

Using *args and **kwargs in the inner wrapper function

To avoid this error when decorating a function that accepts arguments, use *args and **kwargs in the inner wrapper function. This allows the inner function to accept any number of positional and keyword arguments and then pass them on to the function that it decorates.

Question 25

What happens to the return value of a decorated function if the wrapper function doesn’t explicitly return a value?

Answer 25

The decorated function will return none

Question 26

What’s the purpose of using the @functools.wraps decorator in a decorator function?

Answer 26

To preserve the original function’s metadata

You’ll use the @functools.wraps decorator in a decorator function to preserve the original function’s metadata, such as its name and documentation. This helps maintain the original function’s identity after decoration.

Question 27

Is it possible to define a decorator without an inner function?

Answer 27

yes .

You can create a decorator that takes a function as an argument and only accesses one of its attributes. The code logic in your decorator might save the attribute to another data structure. Then, the decorator returns the function object unmodified.