Question

I have several python scripts run parallel this simple code:

test_id = id('test')

Is test_id unique or not?

Answer 1

http://docs.python.org/library/functions.html#id

Return the “identity” of an object. This is an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime. Two objects with non-overlapping lifetimes may have the same id() value.
CPython implementation detail: This is the address of the object.

So yes, the IDs are unique.

However, since Python strings are immutable, id('test') may be the same for all strings since 'test' is 'test' is likely to be True.