计算文本文件中的字母 - 频率

Question

I have a given text file with letters a, b, .., z with their given occurence. I wrote it like this

"letter";"occurences"
a;105
b;29
...
z;0

I have to use this data to create a vector "freq" of length 26 containing the frequency of occurrence of each of the 26 letters from a to z.

def letterFrequency(small_text):
    filein = open("small_text.txt", "r") # Opens the file for reading
    lines = filein.readlines() # Reads all lines into an array
    smalltxt = "".join(lines) # Joins the lines into one big string
    freq = 0
    n = 1296
    for letter in lines:
        np.count_nonzero(letter)
        freq.append(letter)
        freq = letter/n
     return freq
print(letterFrequency('small_text.txt'))

The total number of n = 1296 which is relevant for the frequency which is given in %, expected output is therefore

[ 8.10185185 2.23765432 2.4691358 4.55246914
12.34567901
2.00617284 1.92901235 6.71296296 7.17592593
0.07716049
1.15740741 3.39506173 1.08024691 6.71296296
7.87037037
1.46604938 0.07716049 6.01851852 5.40123457
10.95679012
2.85493827 0.92592593 2.93209877 0.
1.54320988 0. ]

Since 105/1296 = 0.081

If anyone would want to help me and navigate me further thank you since my code isn't working!

Answer 1

you need to create a list to store the values and append into this list

Also instead of hardcoding 1296 you should get the accumulated frequency and then divide by this.

def letterFrequency(filename):
    frequencies = []
    letters = []
    accum = 0
    with open(filename, 'r') as fin:
        for line in fin:
            letter, freq = line.split(';')
            try: 
                freq = int(freq)
            except ValueError:       # to handle the first line
                continue
            accum += freq
            letters.append(letter)
            frequencies.append(freq)

        # normalize frequencies
        frequencies = [i/accum for i in frequencies]

    # you need to keep a list of letters, otherwise how do you
    # know to which letter does each frequency belong?
    return letters, frequencies