Python Basics Flashcards

Question 1

Python: how do you get the length of a list?

Accepted Answer

len(my_list)

Question 2

Python: merge two dictionaries (3.9+)?

Accepted Answer

merged = d1 | d2

Question 3

Python: what does a list comprehension look like?

Accepted Answer

[x * 2 for x in items if x > 0]

Question 4

Python: how do you open a file safely?

Accepted Answer

with open("file.txt") as f: — auto-closes on exit

Question 5

Python: remove duplicates from a list (order not needed)?

Accepted Answer

list(set(my_list))

Question 6

Python: what is the danger of a mutable default argument?

Accepted Answer

It is shared across all calls — use None and create inside the function

Question 7

Python: iterate with index and value?

Accepted Answer

for i, value in enumerate(items):

Question 8

Python: f-string syntax?

Accepted Answer

f"Hello {name}, you are {age}"

Question 9

Python: difference between a list and a tuple?

Accepted Answer

Lists are mutable; tuples are immutable

Question 10

Python: how do you handle exceptions?

Accepted Answer

try: ... except SomeError as e: ... (optionally finally:)

Free Python Basics Flashcards