Does sys.modules have any specific order?

Question

Specifically, are they in order of first imported to last? Or some other order? Undefined order?

Answer 1

Sys.modules is a dict; dicts, being hash-tables, have undefined ordering.

See this question: How to determine if one module has been loaded before or after another

EDIT: As of 3.7, dictionaries are ordered. From my experiments, the order in which you import stuff does seem to match the order in which they appear in sys.modules.