Lost Horizon Lost Horizon Lost Horizon is a 1933 novel by English writer James Hilton. The book was turned into a movie, also called "Lost Horizon", in 1937 by director Frank Capra. It is best remembered as the origin of Shangri-La, a fictional utopian lamasery located high in the mountains of Tibet. Hugh Conway, a veteran member of the British diplomatic service, finds inner peace, love and a sense of purpose in Shangri-La, whose inhabitants enjoy unheard-of longevity. The prologue and epilogue are narrated by a neurologist. This neurologist and a novelist friend, Rutherford, are given dinner at Tempelhof, Berlin, by their
S-expression be formatted as pretty printed S-expressions using the function PPRINT (note: with two Ps, short for "pretty"-print). Lisp programs are valid s-expressions, but not all s-expressions are valid Lisp programs. codice_21 is a valid s-expression, but not a valid Lisp program, since Lisp uses prefix notation and a floating point number (here 1.0) is not valid as an operation (the first element of the expression). An S-expression preceded by a single quotation mark, as in codice_22, is syntactic sugar for a quoted S-expression, in this case codice_23. S-Expressions are often compared to XML, a key difference being that S-Expressions are