The concept of global variables constitutes a mechanism within imperative programming where state is maintained in the enclosing (module-level) scope rather than the local function scope. This theory relies on the lexical scoping rules defined by the Language Environment, distinguishing between global storage and local stack-allocated memory. It serves as the foundational principle for shared mutable state across execution boundaries within a single process, enabling code reuse and coordination without explicit parameter passing.
Prerequisite chain context: requires Python Module Import Mechanics in Python.