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A hands-on exploration of Mojo's actual Python compatibility reveals significant gaps between its marketing and reality. Despite being advertised as 'Pythonic' and a future Python superset, Mojo requires explicit type annotations, doesn't support top-level expressions, lacks standard library modules like shutil, doesn't support named format arguments, f-strings, or the __name__ check. Attempting to port a simple static site generator from Python to Mojo required multiple rewrites and still failed on key features. Performance benchmarks show that when using Mojo to run Python code via CPython interop, it's actually ~3x slower than plain Python for this workload. The language is early-stage (released 2023), well-funded at $380M, and has an open-source standard library, but is far from being a Python replacement today.

Mojo's not (yet) Python