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Functionality we provide in builtin io module is fairly minimal. Some code, including CPython stdlib, depends on more functionality. So, there's a choice to either implement it in C, or move it _io, and let implement other functionality in Python. 2nd choice is pursued. This setup matches CPython too (_io is builtin, io is Python-level).
This directory contains tests for various functionality areas of MicroPython. To run all stable tests, run "run-tests" script in this directory. Note that bytecode tests are not yet stable and should be run separately in "bytecode" subdirectory. When creating new tests, anything that relies on float support should go in the float/ subdirectory. Anything that relies on import x, where x is not a built-in module, should go in the import/ subdirectory.