Question

Python

Modify your program from Learning Journal Unit 7 to read dictionary items from a file and write the inverted dictionary to a file.

You will need to decide on the following:

• How to format each dictionary item as a text string in the input file.
• How to covert each input string into a dictionary item.
• How to format each item of your inverted dictionary as a text string in the output file.

Create an input file with your original three-or-more items and add at least three new items, for a total of at least six items.

Include the following in your Learning Journal submission:

• The input file for your original dictionary (with at least six items).
• The Python program to read from a file, invert the dictionary, and write to a different file.
• The output file for your inverted dictionary.
• A description of how you chose to encode the original dictionary and the inverted dictionary in text files.

Assignment from Learning Journal Unit 7:

Create a Python dictionary that returns a list of values for each key. The key can be whatever type you want.

Design the dictionary so that it could be useful for something meaningful to you. Create at least three different items in it. Invent the dictionary yourself. Do not copy the design or items from some other source.

Next consider the invert_dict function from Section 11.5 of your textbook.

# From Section 11.5 of:
# Downey, A. (2015). Think Python: How to think like a computer scientist. Needham, Massachusetts: Green Tree Press.

def invert_dict(d):
inverse = dict()
for key in d:
  val = d[key]
if val not in inverse:
inverse[val] = [key]
else:
inverse[val].append(key)
return inverse

Modify this function so that it can invert your dictionary. In particular, the function will need to turn each of the list items into separate keys in the inverted dictionary.

Run your modified invert_dict function on your dictionary. Print the original dictionary and the inverted one.

Include your Python program and the output in your Learning Journal submission.

Describe what is useful about your dictionary. Then describe whether the inverted dictionary is useful or meaningful, and why.

Program I wrote from Learning Journal Unit 7:

spanish_dict = {"Hola" : "Hello", "Felicidad" : "Happiness", "Amor" : "Love", "Gato" : "Cat", "Pero" : "Dog", "Gracias" : "Thank you", "Adios" : "Good bye", "Si" : "Yes", "Venir" : "To Come", "Decir" : "To say"}

def invert_dict(x):
inverse = dict()

for key1 in x.keys():
list_items = x.get(key1)
inverse[list_items]=key1
return inverse

print(invert_dict(spanish_dict))

Answer 1

Note: Done accordingly. Please comment for any problem. Please Uprate. Thanks

Code:

import csv
def readFile():
filename="file.txt"
dictionary={}
with open(filename) as csv_file:
csv_reader = csv.reader(csv_file, delimiter=',')
for row in csv_reader:
key=row[0]
value=row[1]
dictionary[key]=value
return dictionary
  
  
def invert_dict(x):
inverse = dict()
for key1 in x.keys():
list_items = x.get(key1)
inverse[list_items]=key1
return inverse

def printResultToFile(data):
file1 = open("result.txt","w")
for key in data:
file1.write(key+","+data[key]+"\n")
file1.close()
  
data=readFile()
data=invert_dict(data)
printResultToFile(data)

Code screenshot:

1 import csv 2 def readFile(): filename="file.txt" dictionary={ } with open(filename) as csv_file: csv_reader - csv.reader(csv_file, delimiter=',') for row in csv_reader: key=row[O] value=row[1] dictionary[key]=value return dictionary 14 def invert_dict(x): inverse = dict() for key1 in x.keys(): list_items = x.get(key1) inverse[list_items] =key1 return inversel 21 def printResultToFile(data): filel = open("result.txt","w") for key in data: 24 filel.write(key+", "+data[key]+"\n") filel.close() 26 27 data=readFile() 28 data-invert_dict(data) 29 printResultToFile(data) 25

file.txt

Hola,Hello
Felicidad,Happiness
Amor,Love
Gato,Cat
Pero,Dog
Gracias,Thank you
Adios,Good bye
Si,Yes
Venir,To Come
Decir,To Say

result.txt

Hello,Hola
Happiness,Felicidad
Love,Amor
Cat,Gato
Dog,Pero
Thank you,Gracias
Good bye,Adios
Yes,Si
To Come,Venir
To Say,Decir

Answer 2

This one took some trial and error, but finally able to get this correct. With my original list, I had three entries for each (with the position, point accumulation, and time needed or if control/position was required), so I cut it back to two as it would be easier to code this. 

import csv  

def readFile():  

    filename="file.txt"  

    dictionary={}

    with open(filename) as csv_file: 

        csv_reader = csv.reader(csv_file, delimiter=',')

        for row in csv_reader:

            key=row[0]

            value=row[1]

            dictionary[key]=value

        return dictionary

  

  

def invert_dict(x): 

    inverse = dict()

    for key1 in x.keys():

        list_items = x.get(key1)

        inverse[list_items]=key1

    return inverse

def printResultToFile(data):

    file1 = open("result.txt","w")

    for key in data:

        file1.write(key+","+data[key]+"\n")

    file1.close()

  

data=readFile()

data=invert_dict(data)

printResultToFile(data)

print (readFile())

print ('----------------------------------------------------------------------')

print (data)

Output:

{'Back control': '4 seconds', 'Mount': ' 4 seconds', 'Guard Pass': ' position', 'Knee on Belly': ' 3 seconds', 'Takedown': ' position', 'Sweep': ' control ', 'Submission Attempt': ' strong', 'Penalty': ' Minus 1', 'DQ': ' End of match', 'Side Control': ' position '}

----------------------------------------------------------------------

{'4 seconds': 'Back control', ' 4 seconds': 'Mount', ' position': 'Takedown', ' 3 seconds': 'Knee on Belly', ' control ': 'Sweep', ' strong': 'Submission Attempt', ' Minus 1': 'Penalty', ' End of match': 'DQ', ' position ': 'Side Control'}

>>> 

File.txt (see attached as well) 

Back control,4 seconds

Mount, 4 seconds

Guard Pass, position

Knee on Belly, 3 seconds

Takedown, position

Sweep, control 

Submission Attempt, strong

Penalty, Minus 1

DQ, End of match

Side Control, position 

result.txt (see attached) 

4 seconds,Back control

 4 seconds,Mount

 position,Takedown

 3 seconds,Knee on Belly

 control ,Sweep

 strong,Submission Attempt

 Minus 1,Penalty

 End of match,DQ

 position ,Side Control

 Added in three more items as requested in the .txt file with penalty, DQ and Side Control for the additions.