Strings

• A string is just a tuple of characters.

• You can do whatever you can do to a tuple to a string.

  For example, accessing the elements:

  >>> s = "immanuel kant"
  >>> s[0]
  'i'
  >>> s[1]
  'm'
  >>> s[-3]
  'a'
  >>> s[-10]
  'a'
  >>> s[-9]
  'n'
  

  You can also slice a string.

  >>> s[:5]
  'imman'
  >>> s[3:7]
  'anue'
  >>> s[:10]
  'immanuel k'
  

• However, strings are immutable. So you cannot assign a value to a string’s element.

  REXML could not parse this XML/HTML: 
  <pre title="interpreter">
  >>> s[8] = 'q'
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: 'str' object does not support item assignment
  </pre>

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