13.While dictionaries are designed so that we can find a value based on a key, every so oftenwe need to perform a reverse lookup.For example, imagine a dictionary where the keys are names and the values are phone numbers.Usually we want to find the phone number based on the name, but occasionally you might need tofind a name based on the phone number.Write a function called reverse_lookup(dictionary, value) that returns all the keys in the dictionaryassociated with the specified value.Note: In dictionaries, the keys are guaranteed to be unique, but the values are not. So your functionshould return a list containing all of the matching keys (if any)Example: Given this dictionary,groups = {'Apple': 'Fruit', 'Spinach': 'Vegetable', 'Banana': 'Fruit'}reverse_lookup (groups. Vegetable')["Spinach']reverse_lookup (groups, Fruit')['Apple'. 'Banana']reverse_lookup (groups. 'Meat')[]

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Answered: 13. While dictionaries are designed so…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Need help with this: Given a word, write a function that will output a dictionary that will give each character of the word and its frequency. Due to its key-value pair format, dictionaries can be used to present some forms of structured data in an easily readable way. This challenge will help you write code to present frequency data for characters in strings. Dictionaries are very good data structures for organizing data in a readable format. Your aim is to write a function called word_counter, which will take in a line of text and output a dictionary with each letter as a key, the value being the frequency of appearance of the letter. Steps Define the function word_counter and have it take a string argument. Iterate through the string and count the occurrences of each character. Output each character as a key in the output dictionary, with the frequency as the value. At the end of your script, call the word_counter function as shown in Snippet 6.46, pass it the string…
Create a python program called t9.py. Add the following functions to this program. Write a main() function to call and test all other functions. Problem 1 (Displaying Dictionaries) Write a function called display(d) that takes a dictionary as its single input parameter. This function will then print the dictionary to the terminal (in no particular order). Sample run: >>> d = {'a':1, 'b':2, 'c':3} >>> print(d){'a': 1, 'b': 2, 'c': 3}>>> display(d) a, 1 b, 2 c, 3 Problem 2 [Safe Add] Write a function called safeAdd(d, k, v, unsafe=False) that takes either three or four input parameters when called. Here, d is a dictionary, k is a key and v is a value. The function will add the key:value pair k:v to the dictionary d if the key k is NOT in the dictionary. If the key is in the dictionary, the function will display the current value for that key, the new value you passed into the function and ask the user if they wish to proceed and overwrite the existing…
# Using the routes dictionary defining places your airline can go with #with mileage to each, create a function that determines the total #distance travelled by going to the airports in sequence defined by this # list itinerary and the routes dictionary. (No published answer... def summary (routesMap) : # Please do not change any code below... airports = list (routesMap.keys ()) for airport in airports: destinations = routesMap [airport] for n in range (0,len (destinations)): destinationInfo = destinations [n] destination = destinationInfo [0] mileage = destinationInfo [1] print (f"Leaving {airport} to {destination} for (mileage} miles.") def distanceUsing (routesMap, itinerary): milesTravelled = 0 ### Your code goes here. return milesTravelled def main (): # Please do not change this dictionary... routes = { main () "Austin": "Chicago": "Dallas": "Denver": "El Paso": "Houston": "Nashville": summary (routes) [["Chicago", 500], ["Houston", 180], ["Nashville", 86011, [["Austin", 500],…
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This is for Python COP 1000. I have to use def main and f strings program9_1.pyThis assignment requires you to create a dictionary by reading the text file created for the Chapter 6 assignment. The dictionary should have player names for the keys. The value for each key must be a two-element list holding the player's goals and assists, respectively. See page 472! Start with an empty dictionary. Then, use a loop to cycle through the text file and add key-value pairs to the dictionary. Close the text file and process the dictionary to print the stats and determine the top scorer as before. In fact, much of the code used in program6_2.py can be copied and used for this program. Printing the stats for each player is the most challenging part of this program. To master this, refer to the examples in the zip file that can be downloaded from the "Dictionary values can be lists" link in the "Learn Here" part of this module. NOTE: you do not need to submit the text file. Submit just this…
Question: Create a function that takes a tuple and returns a dictionary which is a histogram for counting the number of occurrences of each number in the tuple.The main program should take the dictionary, transform the elements into a list, use sort () to order the list (in ascending order) and after that display the list. Please use a picture, commentary for a better understanding and your own code thank you for the exemple, it's the picture
Python I have a text file I need to input that has all the States and their capitals laid out like this. New York Albany Georgia Atlanta Then I need to put them into a dictionary using a while loop. I'm having trouble figuring out how to make the state a key and the capital a value in the dictionary. This is the request from the proffessor. Remember the state name is on one line, and the capital is on the following line, so it makes sense to read the file using a while loop. The file reader steps look like this. Define & initialize your variables Open the file Read the first line to get a state While the state is not EOF Read the following line to get capital Strip off the EOL characters Stuff capital into a dictionary using the state as key Read next state Close the file Return the dictionary variable
Assume, you have been given a dictionary where the keys present the name of the father and the value is a list of names of the sons of that person. For example A has 3 sons namely X, Y, and Z. Again X has three sons namely E, F, and G. So, A is the grandfather of E, F, and G. family = {"A" : ["X", "Y", "Z"], "B": ["M", "N"], "W" : ["A", "B"], "X" : ["E", "F", "G"]} You need to write a code which takes an input and prints the names of all his grandsons in the format shown in output samples. If he does not have any grandchildren just print “Get your sons married first! Wanna_be_grandpa!!” You can assume the input will always be a key from the dictionary. But we will check your code with a different dictionary. So do not write a code for this particular dictionary only. Enter Assume, you have been given a dictionary where the keys present the name of the father and…
This section has been set as optional by your instructor. OBJECTIVE: Write a program in Python that prints the middle value of a dictionary's values, using test_dict from the test_data.py module. NOTE: test_dict is created & imported from the module test_data.py into main.py Example 1: test dict = {'a':1,'b':9,'c':2,'d':5} prints 5 Example 2: test_dict = {'b':9,'d':5} prints 5 Hint: You may(or may not) find the following function useful: list.sort() which sorts the elements in a list. Note: the result is automatically stored in the original list, and return value from the function is None Туре list = [1, 2,3,2,1] After calling: list = [1,1,2,2,3] list.sort(), 339336.2266020 x3zgy7 LAB 13.11.1: Middlest Value (Structured Types) АCTIVITY 0/11 File is marked as read only Current file: test_data.py 1 #This module creates the test_dict to be used in main.py 2 #Reads input values from the user & places them into test_dict 3 dict_size = int(input()) #Stores the desired size of test_dict. 4…
PYTHON QUESTION This assignment requires you to create a dictionary by reading the text file created for the Chapter 6 assignment. The dictionary should have player names for the keys. The value for each key must be a two-element list holding the player's goals and assists, respectively. See page 472! Start with an empty dictionary. Then, use a loop to cycle through the text file and add key-value pairs to the dictionary. Close the text file and process the dictionary to print the stats and determine the top scorer as before. In fact, much of the code used in program6_2.py can be copied and used for this program. Printing the stats for each player is the most challenging part of this program. To master this, refer to the examples in the zip file that can be downloaded from the "Dictionary values can be lists" link in the "Learn Here" part of this module. NOTE: you do not need to submit the text file. Submit just this program. The required output should be the same well-formatted table…

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