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text
This type corresponds to ``unicode`` on Python 2 and ``str`` on Python
3. This is equivalent to ``six.text_type``.
+
+ nonce
+ A nonce is a **n**\ umber used **once**. Nonces are used in many
+ cryptographic protocols. Generally, a nonce does not have to be secret
+ or unpredictable, but it must be unique. A nonce is often a random
+ or pseudo-random number (see :doc:`Random number generation
+ </random-numbers>`). Since a nonce does not have to be unpredictable,
+ it can also take a form of a counter.