Limiting Entry widget to numeric input

  I am using glade to setup a user interface and I would like to have Entry boxs which only accept numerical 
input (both integer and floating point, both positive and negative values) and also perform data validation 
(ie, data stays within specified limits).  
  I've looked at SpinButtons but I do not want to have the up/down arrows.
  Is there some widget which implements the data verification functions of a Spinbutton but only displays the 
associated Entry box?    Alternately, is there a simple way to get a Spinbutton to not display the up/down 
  I would think that having a numeric input only Entry widget would be a pretty common feature, so maybe I 
missed it?

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