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The documentation for round() says:
round(x[, n])
Return the floating point value x rounded to n digits after the decimal point. If n is omitted, it defaults to zero. Delegates to x.__round__(n).
(from http://docs.python.org/dev/library/functions.html#round )
However, we have the following:
Python 3.3.0rc2+ (default:1704deb7e6d7+, Sep 16 2012, 04:49:45) 
>>> round(x=4.7)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: Required argument 'number' (pos 1) not found
>>> round(number=4.7)
5
The second argument is also affected:
>>> round(5.1234, n=3)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: 'n' is an invalid keyword argument for this function
>>> round(5.1234, ndigits=3)
5.123