python 新手 一个简单的错误检查不出来

f = open('tmp.dump','r')
lines = f.readlines( )
f.close()

results = [ ]

for line in lines:
    data = line.split( )
    for atoms in data[1:6]:
      result1 = data[1]
      result2 = data[2]
      if result1 <10:
      result = result1
      elif result2 <10:
      result =result2 ;
      print (result)
      results.append(result)

output = open('result.txt','w')
output.writelines(results)
output.close( )
运行的时候老是显示result这个地方错误，刚接触python不知道语法哪里错了