Week 10 Jeopardy

Filter & Map

100

list(map(lambda x: x + 10, [1, 2, 3]))

[11, 12, 13]

200

list(filter(lambda x: x % 2 == 1, [1, 2, 3, 4, 5]))

[1, 3, 5]

300

list(map(str, [1, 2, 3]))

['1', '2', '3']

400

list(filter(lambda k: len(k) > 3, {"cat": 1, "lion": 2, "dog": 3, "tiger": 4}))

['lion', 'tiger']

500

list(map(lambda x: x*2, filter(lambda x: x > 2, [1, 2, 3, 4])))

[6, 8]

File Handling

100

Which function do you use to create a file object?

open

200

What does f.readlines() return? (f is a given file object)

Read all the lines from a file object f and returns them as a list of strings.

300

What are the 3 basic file modes?

'r', 'w', 'a'

400

Describe a syntax that avoids explicitly calling f.close() where f is a file object.

with open("example.txt", "r") as f:

    data = f.read()

500

How do you save and load Python objects?

import json

with open("data.json", "w") as f:   # 'w' = write mode

    json.dump(data, f)

with open("data.json", "r") as f:   # 'r' = read mode

    loaded_data = json.load(f)

Type of Error

100

Suggest an example where the IndexError is triggered.

[1, 2, 3][5]

200

Suggest an example where the FileNotFoundError is triggered.

open("no_such_file.txt")

300

Why is it recommended to specify the error type when we try to use a try except statement?

Make your code safer, more predictable, and easier to debug. Without error type it will catch unintended exceptions.

400

Suggest an example where the NameError is triggered.

print(unknown_variable)

500

Suggest examples for TypeError and ValueError.

TypeError: 3 + "three"

ValueError: int("abc")