Quiz 1 coursera python

What will be the output of the following code?

import re

string = 'bat, lat, mat, bet, let, met, bit, lit, mit, bot, lot, mot'

result = re.findall('b[ao]t', string)

print(result)

• 'bat, bot'

• ['bat', 'bot']

• 'bat, bet, bit, bot'

• ['bat', 'bet', 'bit', 'bot']

Assume a and b are two (20, 20) numpy arrays. The L2-distance (defined above) between two equal dimension arrays can be calculated in python as follows:

def l2_dist(a, b):

    result = ((a - b) * (a - b)).sum()

    result = result ** 0.5

    return result 

• l2_dist(a.T, b.T)

• l2_dist(np.reshape(a, (20 20)), np.reshape(b, (20 20, 1)))

• l2_dist(np.reshape(a, (20 20)), np.reshape(b, (20 20)))

• l2_dist(a, b)

Consider the following variables in Python:

a1 = np.random.rand(4)

a2 = np.random.rand(4, 1)

a3 = np.array([[1, 2, 3, 4]])

a4 = np.arange(1, 4, 1)

a5 = np.linspace(1 ,4, 4)

Which of the following statements regarding these variables is correct?

• a5. shape == a1. shape

• a4. ndim() == 1

• a3. shape == a4. shape

• al. shape == a2. shape

Which of the following is the correct output for the code given below?

import numpy as np

old = np. array([[1, 1, 1], [1, 1, 1]])

new = old

new[0, : 2] = 0

print (old)

• [[1 1 1] [1 1 1]]

• [[0 0 1] [1 1 1]]

• [[1 1 0][1 1 0]]

• [[0 1 1][0 1 1]]

Given the 6x6 NumPy array r shown below, which of the following options would slice the shaded elements?

• r[[2, 3], [2, 3]]

• r [2: 4, 2: 4]

• r[[2, 4], [2, 4]]

• r[2: 3, 2: 3]

import re

s = ACBСAC"

For the given string, which of the following regular expressions can be used to check if the string starts with 'AC'?

• re. findall(' [^A]C', s)

• re. findall(' ^AC', s)

• re. findall(' AC', s)

• re.findall('^[AC]', s)

What will be the output of the variable L after the following code is executed?

import re

s = 'ACAABAACAAAB'

result = re.findall('A{1,2}', s)

L = len(result)

• 8

• 12

• 5

• 4

Which of the following is the correct regular expression to extract all the phone numbers from the following chunk of

text:

'Office of Research Administration: [phone] | 4325 North Quad

Office of Budget and Financial Administration: [phone] | 309 Maynard, Suite 205

Health Informatics Program: [phone] | 333 Maynard, Suite 500

Office of the Dean: [phone] | 4322 North Quad

UMSI Engagement Center: [phone] | 777 North University

Faculty Administrative Support Staff: [phone] | 4322 North Quad'

• [(]\d{3}[)]\s\d{3}[-]\d{4}

• \d{3}[-]\d{3}[-]\d{4}

• \d{3}\s\d{3}[-]\d{4}

• [(]\d{3}[)]\d{3}[-]\d{4}

Which of the following regular expressions can be used to get the domain names (e.g. google.com, www.baidu.com) from the following sentence?

'I refer to https://google.com and I never refer http://www.baidu.com if I have to search anything'

• (?<=https:\/\/)([.]*)

• (?<=https:\/\/)([A-Za-z0-9.]*)

• (?<=https:\/\/)([A-Za-z0-9]*)

• (?<=[https]:\/\/)([A-Za-z0-9.]*)

The text from the Canadian Charter of Rights and Freedoms section 2 lists the fundamental freedoms afforded to everyone. Of the four choices provided to replace X in the code below, which would accurately count the number of fundamental freedoms that Canadians have?

text=r'''Everyone has the following fundamental freedoms:

    (a) freedom of conscience and religion;

    (b) freedom of thought, belief, opinion and expression, including freedom of the press and other media of communication;

    (c) freedom of peaceful assembly; and

    (d) freedom of association.'''

import re

pattern = X

print(len(re.findall(pattern,text)))

• 'freedom'

• \(.\) 

• '[a-d]'

• (.)