Частотный анализ

str = open("input.txt", "r").read().lower()
f = {}
n = 0
for c in str:
   if ord('a') <= ord(c) <= ord('z'):
       x = f.get(c, 0)
       f[c] = x + 1
       n += 1
lout = [(k, "{:5.3f}".format(f[k]/n)) for k in f.keys()]
lout.sort(key = lambda x: x[0])
lout.sort(key = lambda x: x[1], reverse = True)
sout = "\n".join([i[0] + " " + i[1] for i in lout])
open("output.txt","w").write(sout)

alfabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
 
 
text = open('work8.txt', 'r').read().lower()
dict_letter = {}
cnt = 0
for i_letter in text:
    if i_letter in alfabet:
       x = dict_letter.get(i_letter, 0)
       dict_letter[i_letter] = x + 1
       cnt += 1
 
 
sort_dict = sorted(dict_letter)
anal = [[i_elem, round((dict_letter[i_elem] / cnt),3)] for i_elem in sort_dict]
analysis = '\n'.join([i_elem[0] + ' ' + str(i_elem[1]) for i_elem in anal])
open('analysis.txt', 'w').write(analysis)

def all_sym(text):
    count = 0
    dct_sym = dict()
 
    for i_line in text:
        for sym in i_line.lower():
            if ord('a') <= ord(sym) <= ord('z'):
                count += 1
                if sym in dct_sym.keys():
                    dct_sym[sym] += 1
                else:
                    dct_sym[sym] = 1
 
    for i in dct_sym:
        dct_sym[i] = round(dct_sym[i] / count, 3)
 
    sym_sort_count = dict()
    for i in dct_sym:
        if dct_sym[i] not in sym_sort_count:
            sym_sort_count[dct_sym[i]] = list(i)
        else:
            sym_sort_count[dct_sym[i]].append(i)
 
    return sym_sort_count
 
 
def analysis_file(some_dict):
    for sym_cnt in sorted(some_dict.keys(), reverse=True):
        for sym in sorted(some_dict[sym_cnt]):
            print(f'{str(sym)} {str(sym_cnt)}')
 
 
file = 'Mama myla ramu.'
answer = analysis_file(all_sym(file))