Не работает вложенное условие

  def count_ones(self, filename):
        """Count the number of ones on the tape."""
        count = 0
        file_open = open(filename,'r')
        file_open.seek(0)
 
        for elements in file_open:
            if elements == '1':
                print elements
                count = count + 1
        print count
        return count

    def count_ones(self, filename):
        """Count the number of ones on the tape."""
        count = 0
        file_open = open(filename,'r')
        file_open.seek(0)
        for elements in file_open:
            for elements in elements:
                if elements == "1":
                    count = count + 1
        print count
        return count

for elements in open(filename):
    if '1' in elements.split():
        count += 1

for elements in open(filename):
    count += elements.count('1')

if(elements - 1 == "-" and elements =="1")

    def count_ones(self, filename):
        """Count the number of ones on the tape."""
        count = 0
        for elements in open(filename):
            count += elements.count('1') - len(re.findall('-1', elements))
        print count
        return count

import re
 
print(len(re.findall(r'(?<!-)1',open(filename).read())))

prev = '' 
count = 0
for elements in open(filename):
    for element in elements:
        if element == '1' and prev != '-':
            count += 1
        prev = element