try this:

 >>> test = ['10\t15', '16\t20', '25\t35', '45\t50','55\t60', '61\t65', 
'75\t80']
 >>> t='\t'.join(test).split('\t')
 >>> t
['10', '15', '16', '20', '25', '35', '45', '50', '55', '60', '61', '65', 
'75', '80']
 >>> t2=[int(i) for i in t]
 >>> t2
[10, 15, 16, 20, 25, 35, 45, 50, 55, 60, 61, 65, 75, 80]
 >>> l= t2[0]
 >>> for i in range(1,len(t2)-1,2):
...     if t2[i+1]-t2[i]>1:
...         print l, '\t', t2[i]
...         l = t2[i+1]
10     20
25     35
45     50
55     65
 >>> print l, '\t', t2[-1]
75     80

-- 
Bob Gailer
510-978-4454

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