Write a function that takes in a sequence s and a function fn and returns a dictionary. The values of the dictionary are lists of elements from s. Each element e in a list should be constructed such that fn(e) is the same for all elements in that list. Finally, the key for each value should be fn(e)
def group_by(s, fn):
""" >>> group_by([12, 23, 14, 45], lambda p: p // 10)
{1: [12, 14], 2: [23], 4: [45]}
>>> group_by(range(-3, 4), lambda x: x * x)
{0: [0], 1: [-1, 1], 4: [-2, 2], 9: [-3, 3]}
"""
Use Python
Answers
Answer:
Here is the Python function:
def group_by(s, fn): #method definition
group = {} #dictionary
for e in s: #for each element from s
key = fn(e) #set key to fn(e)
if key in group: #if key is in dictionary group
group[key].append(e) #append e to the group[key]
else: #if key is not in group
group[key] = [e] #set group[key] to [e]
return group #returns dictionary group
Explanation:
To check the working of the above function call the function by passing a sequence and a function and use print function to display the results produced by the function:
print(group_by([12, 23, 14, 45], lambda p: p // 10))
print(group_by(range(-3, 4), lambda x: x * x))
function group_by takes in a sequence s and a function fn as parameters. It then creates an empty dictionary group. The values of the dictionary are lists of elements from s. Each element e in a list is constructed such that fn(e) is the same for all elements in that list. Finally, the key for each value is fn(e). The function returns a dictionary. The screenshot of the program along with its output is attached.
Related Questions
what is the use of buffer?
Answers
Answer:
pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. ... Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.
Explanation:
there is your answer i got this one correct
hope it is helpful
Answer:
Limits the pH of a solution
Explanation:
A P E X
Which online text source would include a review of a new TV show?
an academic journal
a blog
an e-book
an encyclopedia
Answers
Answer:
Blog
Explanation:
Online text sources include blogs, e-books, encyclopaedias, and e-zines. As a result, options A, B, C, and D are correct.
What is a text source?A source is a book or other material that contains the data that has been used, whereas a citation is the actual statement of the starting point. They were researchers who also worked as professors, writers, and other professionals, and they published books and articles.
Online text sources are those that can be accessed from anywhere and are available on the internet. The online text shows that anyone can see or exceed including blogs, e-books, encyclopaedias, and e-zines.
These are available for further studies and research. Also to give information this can be a source. Therefore, options A, B, C, and E is the correct option.
Learn more about text sources, here:
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Choose the word to make the sentence true. The ____ function is used to display the program's output.
O input
O output
O display
Answers
The output function is used to display the program's output.
Explanation:
As far as I know this must be the answer. As tge output devices such as Monitor and Speaker displays the output processed.
The display function is used to display the program's output. The correct option is C.
What is display function?Display Function Usage displays a list of function identifiers. It can also be used to display detailed usage information about a specific function, such as a list of user profiles with the function's specific usage information.
The displayed values include the prefix, measuring unit, and required decimal places.
Push buttons can be used to select functions such as summation, minimum and maximum value output, and tare. A variety of user inputs are available.
A display is a device that displays visual information. The primary goal of any display technology is to make information sharing easier. The display function is used to display the output of the program.
Thus, the correct option is C.
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Which of the following documents has a template available in the online templates for your use?
letters
resumés
reports
all of the above
Answers
Answer:
The answer is all of the above.
Explanation:
1.2
Is media a curse or a blessing? Explain.
Answers
Answer:
i think its both because if there is misunderstanding between media and government then the media distroys the government and if there us no misunderstanding between media and government and if it goes smoothly then its like a blessing for government
Answer:
Media is a blessing...a curse as well when it's misguiding the world and hiding the real sinner and juxtaposing the culprit as the saviour
Write a program that asks for the names of three runners and the time, in minutes, it took each of them to finish a race. The program should display the names of the runners in the order that they finished.
Answers
Answer:
Written in Python
names = []
times = []
for i in range(0,3):
nname = input("Name "+str(i+1)+": ")
names.append(nname)
time = input("Time "+str(i+1)+": ")
times.append(time)
if times[2]>=times[1] and times[2]>=times[0]:
print(names[2]+" "+times[2])
if times[1]>=times[0]:
print(names[1]+" "+times[1])
print(names[0]+" "+times[0])
else:
print(names[0]+" "+times[0])
print(names[1]+" "+times[1])
elif times[1]>=times[2] and times[1]>=times[0]:
print(names[1]+" "+times[1])
if times[2]>times[0]:
print(names[2]+" "+times[2])
print(names[0]+" "+times[0])
else:
print(names[0]+" "+times[0])
print(names[2]+" "+times[2])
else:
print(names[0]+" "+times[0])
if times[2]>times[0]:
print(names[2]+" "+times[2])
print(names[1]+" "+times[1])
else:
print(names[1]+" "+times[1])
print(names[2]+" "+times[2])
Explanation:
I've added the full source code as an attachment where I used comments to explain difficult lines
(d) Assume charArray is a character array with 20 elements stored in memory and its starting memory address is in $t5. What is the memory address for element charArray[5]?
Answers
Answer:
$t5 + 5
Explanation:
Given that ;
A character array defines as :
charArray
Number of elements in charArray = 20
Starting memory address is in $t5
The memory address for element charArray[5]
Memory address for charArray[5] will be :
Starting memory address + 5 :
$t5 + 5
CJ is developing a new website blogging about cutting-edge technologies for people with special needs. He wants to make the site accessible and user friendly.
CJ knows that some of the visitors who frequent his website will use screen readers. To allow these users to bypass the navigation, he will use a skip link, He wants to position the skip link on the right but first he must use the ____ property.
a) display
b) right
c) left
d) nav
Answers
Answer:
The answer is "Option c".
Explanation:
It is an internal page reference which, whilst also completely new pages, allow navigating around the current page. They are largely used only for bypassing and 'skipping' across redundant web page content by voice command users, that's why the CJ would use a skip link to enable those users to bypass specific navigation, and he also wants to put this link on the right, but first, he needs to use the left property.
Custom function definitions:________.
A. Must be written before they are called by another part of your program
B. Must declare a name for the function
C. Must include information regarding any arguments (if any) that will be passed to the function
D. all of the above
Answers
Answer:
D. all of the above
Explanation:
A option is correct and function definition must be written before they are called by another part of your program. But in languages such as C++ you can write the prototype of the function before it is called anywhere in the program and later write the complete function implementation. I will give an example in Python:
def addition(a,b): #this is the definition of function addition
c = a + b
return c
print(addition(1,3)) #this is where the function is called
B option is correct and function definition must declare a name for the function. If you see the above given function, its name is declared as addition
C option is correct and function definition must include information regarding any arguments (if any) that will be passed to the function. In the above given example the arguments are a and b. If we define the above function in C++ it becomes: int addition( int a, int b)
This gives information that the two variables a and b that are parameters of the function addition are of type int so they can hold integer values only.
Hence option D is the correct answer. All of the above options are correct.
In this exercise you will debug the code which has been provided in the starter file. The code is intended to take two strings, s1 and s2 followed by a whole number, n, as inputs from the user, then print a string made up of the first n letters of s1 and the last n letters of s2. Your job is to fix the errors in the code so it performs as expected (see the sample run for an example).
Sample run
Enter first string
sausage
Enter second string
races
Enter number of letters from each word
3
sauces
Note: you are not expected to make your code work when n is bigger than the length of either string.
1 import java.util.Scanner;
2
3 public class 02_14_Activity_one {
4 public static void main(String[] args) {
5
6 Scanner scan = Scanner(System.in);
7
8 //Get first string
9 System.out.println("Enter first string");
10 String s1 = nextLine(); 1
11
12 //Get second string
13 System.out.println("Enter second string");
14 String s2 = Scanner.nextLine();
15
16 //Get number of letters to use from each string
17 System.out.println("Enter number of letters from each word");
18 String n = scan.nextLine();
19
20 //Print start of first string and end of second string
21 System.out.println(s1.substring(1,n-1) + s2.substring(s1.length()-n));
22
23
24 }
Answers
Answer:
Here is the corrected program:
import java.util.Scanner; //to accept input from user
public class 02_14_Activity_one { //class name
public static void main(String[] args) { //start of main method
Scanner scan = new Scanner(System.in); //creates Scanner class object
System.out.println("Enter first string"); //prompts user to enter first string
String s1 = scan.nextLine(); //reads input string from user
System.out.println("Enter second string"); //prompts user to enter second string
String s2 = scan.nextLine(); //reads second input string from user
System.out.println("Enter number of letters from each word"); //enter n
int n = scan.nextInt(); //reads value of integer n from user
System.out.println(s1.substring(0,n) + s2.substring(s2.length() - n ));
} } //uses substring method to print a string made up of the first n letters of s1 and the last n letters of s2.
Explanation:
The errors were:
1.
Scanner scan = Scanner(System.in);
Here new keyword is missing to create object scan of Scanner class.
Corrected statement:
Scanner scan = new Scanner(System.in);
2.
String s1 = nextLine();
Here object scan is missing to call nextLine() method of class Scanner
Corrected statement:
String s1 = scan.nextLine();
3.
String s2 = Scanner.nextLine();
Here class is used instead of its object scan to access the method nextLine
Corrected statement:
String s2 = scan.nextLine();
4.
String n = scan.nextLine();
Here n is of type String but n is a whole number so it should be of type int. Also the method nextInt will be used to scan and accept an integer value
Corrected statement:
int n = scan.nextInt();
5.
System.out.println(s1.substring(1,n-1) + s2.substring(s1.length()-n));
This statement is also not correct
Corrected statement:
System.out.println(s1.substring(0,n) + s2.substring(s2.length() - n ));
This works as follows:
s1.substring(0,n) uses substring method to return a new string that is a substring of this s1. The substring begins at the 0th index of s1 and extends to the character at index n.
s2.substring(s2.length() - n ) uses substring method to return a new string that is a substring of this s2. The substring then uses length() method to get the length of s2 and subtracts integer n from it and thus returns the last n characters of s2.
The screenshot of program along with its output is attached.
Write a program that computes and display the n! for any n in the range1...100
Answers
Answer:
const BigNumber = require('bignumber.js');
var f = new BigNumber("1");
for (let i=1; i <= 100; i++) {
f = f.times(i);
console.log(`${i}! = ${f.toFixed()}`);
}
Explanation:
Above is a solution in javascript. You will need a bignumber library to display the numbers in full precision.
To create a public key signature, you would use the ______ key.
Answers
Answer:
To create a public key signature, you would use the _private_ key.
Explanation:
To create a public key signature, a private key is essential to enable authorization.
A private key uses one key to make data unreadable by intruders and for the data to be accessed the same key would be needed to do so.
The login details and some important credentials to access user data contains both the user's public key data and private key data. Both private key and public key are two keys that work together to accomplish security goals.
The public key uses different keys to make data readable and unreadable.
The public key is important to verify authorization to access encrypted data by making sure the access authorization came from someone who has the private key. In other words, it's a system put in place to cross-check the holder of the private key by providing the public key of the encrypted data that needed to be accessed. Though, it depends on the key used to encrypt the data as data encrypted with a public key would require a private key for the data to be readable.
there are no more than 60 people in a certain class to participate in the final .the exam subjects are programming, English, and mathematics .the following functions are realized by two dimensional array programming.calculate the average score of each student
Answers
Answer:
If there are many people in the class and if most of these people have never done such an intensive proof-based class, then I'd say this is not so surprising that the class average would be 56%-34%
Explanation:
hopes this help this question threw me off a lot
Type the correct answer in the box
in which phishing technique are URLs of the spoofed organization misspelled?
anon
is a phishing technique in which URLs of the spoofed organization are misspelled
Answers
Answer: Link manipulation
Explanation:
Answer:
Typo Squatting
Explanation:
Write a method called min that takes three integers as parameters and returns the smallest of the three values, such that a call of min(3, -2, 7) would return -2, and a call of min(19, 27, 6) would return 6. Use Math.min to write your solution.
Answers
Answer:
public class Main
{
public static void main(String[] args) {
System.out.println(min(3, -2, 7));
}
public static int min(int n1, int n2, int n3){
int smallest = Math.min(Math.min(n1, n2), n3);
return smallest;
}
}
Explanation:
*The code is in Java.
Create a method named min that takes three parameters, n1, n2, and n3
Inside the method:
Call the method Math.min() to find the smallest among n1 and n2. Then, pass the result of this method to Math.min() again with n3 to find the min among three of them and return it. Note that Math.min() returns the smallest number among two parameters.
In the main:
Call the method with parameters given in the example and print the result
Methods are named program statements that are executed when called/invoked.
The method in Python, where comments are used to explain each line is as follows:
#This defines the method
def mmin(a,b,c):
#This calculates the smallest of the three values using math.min
minNum = min(a,b,c)
#This prints the smallest value
return minNum
Read more about methods at:
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The state way of grading drivers is called what?
*
Answers
Shortest Remaining Time First is the best preemptive scheduling algorithm that can be implemented in an Operating System.
a. True
b. False
Answers
Answer:
a
Explanation:
Yes, true.
Shortest Remaining Time First, also popularly referred to by the acronym SRTF, is a type of scheduling algorithm, used in operating systems. Other times it's not called by its name nor its acronym, it is called the preemptive version of SJF scheduling algorithm. The SJF scheduling algorithm is another type of scheduling algorithm.
The Shortest Remaining Time First has been touted by many to be faster than the SJF
The answer to the question which asks if the Shortest Remaining Time First is the best preemptive scheduling algorithm that can be implemented in an Operating System is:
TrueWhat is Shortest Remaining Time First?This refers to the type of scheduling algorithm which is used to schedule tasks that would be executed in the processing unit in an Operating System based on the shortest time taken to execute the task.
With this in mind, we can see that this is the best preemptive scheduling algorithm that can be implemented in an Operating System because it makes task execution faster.
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Alice just wrote a new app using Python. She tested her code and noticed some of her lines of code are out of order. Which principal of programing should Alice review?
Answers
Answer:
sequencing
Explanation:
from flvs
Answer:
Sequencing
Explanation:
What is a piece of information sent to a function
Answers
Answer:
the information sent to a function is the 'input'.
or maybe not hehe
The reading element punctuation relates to the ability to
pause or stop while reading.
emphasize important words.
read quickly yet accurately.
understand word definitions.
Answers
Answer:
A
Explanation:
Punctations are a pause or halt in sentences. the first one is the answer so do not mind the explanation.
semi colons, colons, periods, exclamation points, and question Mark's halt the sentence
most commas act as a pause
Answer: (A) pause or stop while reading.
Explanation:
List three hardware computer components? Describe each component, and what its function is.
Answers
Answer:
moniter: a screen and is used to see what the computer is running
webcam: the camera on the computer. can be already built in or added
power supply: an electrical device that supplies power to an electrical load
Explanation:
Answer:
Input device
output device
C.P.U