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How Python Runs PRograms
Process: source code -> compiled byte code -> pvM (Python Virtual Machine) runs byte code
PErformance loss: compilation + extra work in running virtual machine
Implementation VARiations: CPython (the standard); Jython; IronPython; Stackless Python; PyPy (wITh JIT compiler).
Optimization: Cython (Python/C hybrid)
Frozen binary: PyInstaller
Python Conceptual HierArchy
programs > modules > statements > exPressions > objects
Core Data Types
- Number (int, float, complex, decimal, fraction, boolean)
- String
- List
- Dictionary
- Tuple
- File
- Set
- None
- Program units: function, module, class
Typing
Variable is created during value assignment. Variable itself has no type information, it simply points to an object and the object can be any type. Python's typing is:
- Dynamic: type is determined automatically at runtime, not declared
- strong: every object has two header fields: type designator; reference counter.
Objects are garbage-collected, programmer doesn't have to free them.
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