Several ways to wrap Python strings

The first

x0 = '<?xml version="1.0"?>' \
     '<ol>' \
     '  <li><a href="/python">Python</a></li>' \
     '  <li><a href="/ruby">Ruby</a></li>' \
     '</ol>'

The second

x1 = '<?xml version="1.0"?> \
<ol> \
    <li><a href="/python">Python</a></li> \
    <li><a href="/ruby">Ruby</a></li> \
</ol>'

The third

'''
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'''
x2 = ('<?xml version="1.0"?>'
      '<ol>'
      ' <li><a href="/python">Python</a></li>'
      ' <li><a href="/ruby">Ruby</a></li>'
      '</ol>')

The fourth

x3 = '''<?xml version="1.0"?>
<ol>
    <li><a href="/python">Python</a></li>
    <li><a href="/ruby">Ruby</a></li>
</ol>'''