| Checks if the value is in the defined range. The range definition is a list/iterator from: 
    
      float values belonging to the defined range x \in 
      {a}
    
      2-tuples of two floats which define a range not including the tuple 
      values itself x \in ]a,b[
    
      2-list of two floats which define a range including the list values 
      x \in [a,b]
     The order of elements is not important. So could define the set of 
  integer numbers by a generator returning the following sequence: 0,1,-1,2,-2,3-,3,... . It returns True if the value is in one of the defined ranges. 
  Otherwise it returns false. 
   |