Ivanon = {'math':4, 'english':4, 'physic':4, 'chemistry':4, 'biology':4}
Netfullin = {'math':5, 'english':4, 'physic':4, 'chemistry':5, 'biology':4}
Pasternak = {'math':5, 'english':4, 'physic':3, 'chemistry':5, 'biology':4}
Lenina = {'math':5, 'english':5, 'physic':5, 'chemistry':5, 'biology':5}

Ivanon = {'math':4, 'english':4, 'physic':4, 'chemistry':4, 'biology':4}
Doe = {'math':5, 'english':5, 'physic':5, 'chemistry':5, 'biology':5}
Mustermann = {'math':5, 'english':5, 'physic':5}
Dvoechnikov = {'math':3, 'english':3, 'physic':3, 'chemistry':3, 'biology':3}

import yaml

In [88]: with open(filename) as f:
    ...:     data = yaml.load(f)
    ...:

In [89]: data
Out[89]: "Ivanon = {'math':4, 'english':4, 'physic':4, 'chemistry':4, 'biology':4} Doe = {'math':5, 'english':5, 'physic':5, '
chemistry':5, 'biology':5} Mustermann = {'math':5, 'english':5, 'physic':5} Dvoechnikov = {'math':3, 'english':3, 'physic':3,
'chemistry':3, 'biology':3}"

[{'Name1':{'subj1':note, 'subj2':note, ...},
 {'Name2':{'subj1':note, 'subj2':note, ...}]

import re
import ast

def parse_line(line):
    name,rest = re.split('s*=s*', line)
    d = ast.literal_eval(rest)
    return {name:d}

filename = r'C:Temp.data774534.txt'

with open(filename) as f:
    data = [parse_line(line) for line in f]

#best_ones =  [n for x in data for n,d in x.items() if all(val == 5 for val in d.values())]
best_ones = [n for x in data for n,d in x.items() if sum(d.values()) == 5*len(d)]
print(best_ones)

['Doe', 'Mustermann']

with open(input_file, 'r') as file:
    for line in file:
        if all([raiting[-1] == '5' for raiting in line[line.index('{') + 1:line.index('}')].split(', ')]):
            print(line[:line.index('=')].strip())

surname_dict = {surname: eval(_dict) for (surname, _dict) in (
    line.split('=', 1) for line in filter(str.strip, open('file.txt')))}

import json
print(json.dumps(surname_dict, indent=4, sort_keys=True))
# {
#     "Ivanon ": {
#         "biology": 4,
#         "chemistry": 4,
#         "english": 4,
#         "math": 4,
#         "physic": 4
#     },
#     "Lenina ": {
#         "biology": 5,
#         "chemistry": 5,
#   ...
#     }
# }

for (surname, subjects) in surname_dict.items():
    if all((val == 5) for val in subjects.values()):
        print(surname, json.dumps(subjects, indent=4))
# Lenina
# {
#     "math": 5,
#     "english": 5,
#     "physic": 5,
#     "chemistry": 5,
#     "biology": 5
# }