non-ML MISC

Question 1

Syntax to flatten a list of lists (without using itertools)

Answer 1

reduce(lambda x,y: x+y, list_of_lists)

Question 2

What is “floor division” and the syntax for doing it?

Answer 2

Like regular division, but rounds down to nearest whole number.
Example: 8 // 3 returns 2

Question 3

Syntax to check whether a variable is of a particular type

Answer 3

isinstance(my_var, some_type)

Question 4

What does .strip() do?

Answer 4

Removes leading and trailing spaces (including “\n”s)

Question 5

What string method removes leading and trailing spaces (including “\n”s)?

Answer 5

.strip()

Question 6

Syntax to stop printing when encounter a particular substring?

Answer 6

print(some_text, end=’ ‘)

Question 7

Syntax to find first index of a substring within a string?

Answer 7

string.find(substring)

Question 8

Syntax to find first appearance of a value within a list?

Answer 8

my_list.index(my_value, start_position)

Question 9

What to use instead of .isnull() and .notnull()?

Answer 9

.isna() and .notna()

Question 10

What is an ML model?

Answer 10

Simply a function that takes observations as inputs and outputs some kind of prediction (e.g., values of a DV) or other outcome (e.g., cluster labels)