Question

Problem 2(a). Letter Frequencies.

? Write Python code that reads a text file into memory and creates a dict object with a frequency count for each letter. For example, for encryptedA.txt, your output should contain the key:value pairs 'a': 78 and 'b': 31.

Notes

• Do not distinguish between uppercase and lowercase letters.
• Ignore punctuation. Punctuation counts must not appear in your dict
• If a given letter does not appear in the text, there must be a key:value pair with value 0.

? Use Python to determine which letter has the highest frequency in each text file, and print the result.

Problem 2(b). Formatting for R.

? Write your two dictionaries with frequency counts from 2(a) to a pair of suitably named .csv files, with one column for the key and one column for the frequency counted. Include both .csv files with your commit to GitHub.

Answer 1

Solution: Code for each asked problem is as following. Each solution is commented in the code. Go through the code once, and if any query/problem do ask in comment section. In this code I have given the functionality of running code on as many as files user want using menu option. Program as for choice 1 or 2. Enter 1 to run the program, then enter file name on which program will run. Enter 2 to quit the program.

valid = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
while True:
  print('Enter 1.For Starting Program | 2.For quit')
  choice = int(input())
  if(choice==1):

    #solution of 2(a) to find frequency of each letter
    freqs = dict()
    for x in valid:
      freqs[x] = 0
    file = input('Enter File Name with \'.text\' extension:\n' )
    with open(file) as f:
        for line in f:
            for char in line.lower():
                if char in valid:
                      freqs[char] += 1

    print("Dictonary for letters is:\n",freqs)

    #Finds the letter with hisghest frequency and displays it on screen
    max  = 0
    letter = ''
    for x,y in freqs.items():
      if y>max:
        max = y
        letter = x

    print("Letter with maximum frequency is:",letter)


    #solution of 2(b) to save distonary in .csv File
    outFile = file.split('.')[0]
    outFile+='.csv'
    with open(outFile, 'w') as f:
        for key in freqs.keys():
            f.write("%s,%s\n"%(key,freqs[key]))
    print("dictonary saved in ",outFile," successfully")
  elif(choice==2):
    break
  else:
    print("Enter Valid option")

Sample Output is as following: