Python knows string and numeric literals:
literal: stringliteral | integer | longinteger | floatnumber
Evaluation of a literal yields an object of the given type (string,
integer, long integer, floating point number) with the given value.
The value may be approximated in the case of floating point literals.
See section 
for details.
All literals correspond to immutable data types, and hence the
object's identity is less important than its value. Multiple
evaluations of literals with the same value (either the same
occurrence in the program text or a different occurrence) may obtain
the same object or a different object with the same value.
(In the original implementation, all literals in the same code block with the same type and value yield the same object.)