Python 4 Engineers — Keeping It In The Short-Term Memory

Test Yourself! Coding in Python, Again!— #PySeries#Episode 15

Short-term memory (STM) is the capacity to keep a small amount of information in mind in an active, readily available state for a short period of time.

This is the goal of this article. Keep python alive!

I enrolled myself in a program, supported by Huawei, and here is the test that I’ve got through to pass for my AI course.

How about to Test Yourself?

Here we go!

Go to Google Colab and open a new notebook and answer these questions (or click bellow:):

Python 4 Engineers — Ep#15 — AI — Huawei.ipynb

01#PyEx — Python —List:

Which of the following matrices will throw an error in Python?

a) X = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
b) X = [[3, 3, 3] [4, 4, 4] [5, 5, 5]]
c) X = [(1, 2, 4), (5, 6, 7), (8, 9, 10)]
d) X = [2, 3, 4, 3, 3, 3, 4, 5, 6]

Hint: In Python, List is used to store collections of data.

Lists are created using square brackets.

Lists are separated by comma, so now it is easy to get a sense, right?

02#PyEx — Python — List — Range():

What will be the output of the following Python code?

A = [[1,2,3], [4,5,6], [7,8,9]]
[A[i][i] for i in range len(A))]

a) [1, 5, 9]
b) [3, 5, 7]
c) [4, 5, 6]
d) [2, 5, 8]

Hint: range() is a built-in function of Python. It is used when a user needs to perform an action for a specific number of times.

Note that the code snipped is inside a List.

03#PyEx — Python — Print():

The print function in Python 3 is enclosed in parentheses?

a) True

b) False

04#PyEx — Python — Functions:

Functions are organized code segments which cannot be reused to implement single or related operations?

a) True

b) False

Hint: Reusing code is key to building a maintainable system. And when it comes to reusing code in Python, it all starts and ends with the humble function. Take some lines of code, give them a name, and you’ve got a function (which can be reused).

05#PyEx — Python — Matrix:

Matrix A and matrix B can be added only if they have the same number of rows and columns?

a) True

b) False

Hint: In statistics two matrices may be added or subtracted only if they have the same dimension; that is, they must have the same number of rows and columns.

Addition or subtraction is accomplished by adding or subtracting corresponding elements. Is that true for python?

06#PyEx — Python — Matrix:

The determinant of a NxN matrix is a scalar?

a) True

b) False

Hint: For any N x M matrix, the determinant is a scalar value equal to the product of the main diagonal elements minus the product of it’s counter diagonal elements.

07#PyEx — Python — List:

Lists in Python can be delimited by square brackets [ ], with the first element at index 0?

a) True

b) False

08#PyEx — Python — Dictionary:

Which of the following format can define a dictionary in Python 3?

a) {“John”: ‘Paris’, “John”: ‘London’}

b) {“Jane”: ‘London’; “John”: ‘London’}

c) {“Jane”: ‘London’, “John”: ‘London’}

d) {“John”: ‘Paris’; “John”: ‘London’}

Hint: Dictionaries are written with curly brackets, and have keys and values.

As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered.

The key repetition will consider only the last input.

09#PyEx — Python — Immutable Data Type in Python 3:

Which of the following is unchangeable in Python 3?

a) Tuple

b) Set

c) Array

d) List

Hint: Besides the different kind of brackets used to delimit them, the main difference between a tuple and a list is that the tuple object is immutable. Once we’ve declared the contents of a tuple, we can’t modify the contents of that tuple.

Some of the mutable data types in Python are list, dictionary, set and user-defined classes. On the other hand, some of the immutable data types are int, float, decimal, bool, string, tuple, and range.

10#PyEx — Python — Indexing in Python 3:

Which of the following statements about Python 3 index are true?

a) Default index from right to left is numbered from 0

b) Default index from right to left is numbered from -1

c) Default index from left to right is numbered from 1

d) Default index from left to right is numbered from 0

Hint: The list index starts with 0 in Python, from left to right

11#PyEx — Python — Indexing in Python 3:

What is the output of the following Python 3 code?

import numpy as np
 
A = np.matrix([[1,2],[3,4],[5,6]])
 
B = np.matrix([[12,11, 10],[9,8,7],[6,5,4], [3,2,1]])
 
C = np.matmul(B, A)
 
print(C.shape)

a) (2, 2)

b) (4, 4)

c) (3, 4)

d) (4, 2)

12#PyEx — Python — Functions in Python 3:

A three-digit integer number is called an Armstrong number if a sum of the cube of its digits equals the number itself. For example, 153 is an Armstrong number because 1 ^ 3 + 5 ^ 3 + 3 ^ 3 = 1 + 125 + 27 = 153. 

Mark the item that completes the IF statement in Python 3 code above and inform correctly if variable n is an Armstrong number.

a) n[0] ** 3 + n[1] ** 3 + n[2] ** 3

b) n[0] ^ 3 + n[1] ^ 3 + n[2] ^ 3

c) (n // 100) ** 3 + ( n // 10 % 10) ** 3 + (n % 10) ** 3

d) (n // 100) ** 3 + (n // 10) ** 3 + (n % 10) ** 3

13#PyEx — Python — Functions in Python 3:

During the first two years, a dog year is equal to 10.5 human years. After that, each dog year is equal to 4 human years. 

Given the following code above in Python 3, what correctly completes the last return statement?

a) dog_age * 4

b) dog_age * 4 + 21

c) (dog_age - 2) * 4

d) (dog_age - 2) * 4 + 21

14#PyEx — Python — Functions in Python 3:

What is the output from the following code in Python 3?

from functools import reduce
 
def abs(x):
  if x < 0:
    x = x * -1
  return x
 
print(reduce(lambda b, a : abs(a) - abs(b), [-5,-4,-3, -1]))

a) 1

b) -1

c) 15

d) -15

15#PyEx — Python — Functions in Python 3:

What will be the output of the following Python 3 code?

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

a) [2, 4]

b) []

c) [3, 5]

d) Invalid arguments for filter function

16#PyEx — Python — Functions in Python 3:

What will be output after we run the following Python 3 code?

vec = [0,1,2]
i = 30
while (i > 0):
  if i > 16:
    vec.append(i)
  elif i < 16:
    vec.pop()
  elif i == 16:
    vec.append(0)
  i-=1
print(len(vec))

a) 1

b) 0

c) 3

d) 2

17#PyEx — Python — Functions in Python 3:

What value of “val” will be printed after we run the following Python 3 code? 

vec  = [2,5,1,9,3,7]
val = 0
for idx, x in enumerate(vec):
  if val < x:
    val = vec[idx]
print(val)

a) 3

b) 9

c) 5

d) 7

18#PyEx — Python — Dictionary in Python 3:

Which of the following options is a Python dictionary?

a) {‘image_file’ = ‘./my_dir/imgs/img_258349xh3’, ‘image_len’ = img.shape[0] * img.shape[1]}

b) {‘id’: 7, ‘pass’: ‘password_key’, ‘width’: 250, ‘height’: 250}

c) (a: 7, b: ‘word’, c:numpy.arange(15))

d) [‘files’: ‘./my_files/tensorflow_files’, ‘folder_tam’: 15]

Answers

1-b; 2–a; 3-a; 4-b; 5-a; 6-a; 7-a;8-a & c;9-a; 10-d; 11-d; 12-c; 13-d; 14-b; 15-c; 16-c; 17-b; 18-b

Google Colab File

Down Raw File

Credits & References

INTRODUÇÃO A MACHINE LEARNING PARA CERTIFICAÇÃO HCIA-AI by crateus.ufc.br

https://www.huawei.com/en/

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