possible to round number and convert to string?

[Dr. Phillip M. Feldman]

This was very close to what I wanted.  Thanks!  My final code looks like
this:

def num2str(x,f=4):
   """Convert x (int or float) to a string with f digits to right of
   the decimal point.  f may be zero or negative, in which case the decimal
   point is suppressed."""
   s= str(round(x,f))
   if f<=0:
      # Delete decimal point:
      i= s.find('.')
      if i>0: s= s[:i]
   return s
-- 
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