possible to round number and convert to string?

[Dr. Phillip M. Feldman]

I'd like to be able to convert a float to a string representation in which
the number is rounded to a specified number of digits.  If num2str is a
hypothetical function that does this, then num2str(pi,3) would be '3.142'
(not '3.141').  I've been told that there is no such function in Python.  I
tried to write this myself, but wasn't successful.  Any suggestions will be
appreciated.
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