Playing around with difflib module in python 2.7

diff.py

import difflib

a = """
one
two
three
four
"""

b = """
one
two
three
"""

def _unidiff_output(expected, actual):
    """
    Helper function. Returns a string containing the unified diff of two multiline strings.
    """

    import difflib
    expected=expected.splitlines(1)
    actual=actual.splitlines(1)

    diff=difflib.unified_diff(expected, actual)

    return ''.join(diff)

diff = difflib.ndiff(a, b)

for d in diff:
    #print d
    pass

#print "=========="

delta = ''.join(x[2:] for x in diff if x.startswith('- '))
#print delta

#print "=========="


difference = _unidiff_output(a,b)
if difference == '':
    print "Strings are the same"
else:
    print "Strings are different"
    print difference