How i can judge my code

[buran]

still guessing, but maybe

foo = '11111111111000000000000000000000'
for char in foo:
    if char == '1':
        print('ok')
    else:
        print('ng')

lines 3-6 can be replaced with single line:

print('ok' if char == '1' else 'ng')

something else

from collections import Counter
foo = '11111111111000000000000000000000'
print(Counter(foo))

This last snippet will output

Output:
Counter({'0': 21, '1': 11})

You get the number of 0s and 1s