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Python

Python. Joseph Eckstrom , Benjamin Moore, Willis Kornegay. Overview. Written to improve programmer productivity Python gives programmers the option to use object-oriented, structured or functional programming paradigms. Trades some speed for productivity In era of fast machines, acceptable.

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Python

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  1. Python Joseph Eckstrom, Benjamin Moore, Willis Kornegay

  2. Overview • Written to improve programmer productivity • Python gives programmers the option to use object-oriented, structured or functional programming paradigms. • Trades some speed for productivity • In era of fast machines, acceptable

  3. History • Written at CWI, Netherlands, by Guido van Rossum • Named BDFL, or “Benevolent Dictator for Life” by Python community • Based on ABC, but ABC had drawbacks • Monolithic design not adaptable • Could not access file system or O.S.

  4. Evolution • Python 1.0 • Classes, inheritance, functional programming • Python 2.0 • Garbage collection, list comprehensions, Haskell-like syntax • Python 3.0 • Refinement of existing features, overhauls to standard libraries

  5. Language Concepts • High level, interpreted language • Supports multiple paradigms • OO, Imperative, Functional • No semicolons at the end of lines • Blocks represented by indentations

  6. Examples of Use – Lambda Functions >>> defmake_incrementor (n): return lambda x: x + n ... >>> f = make_incrementor(2) >>> g = make_incrementor(6) >>> print(f(42), g(42)) 44 48 >>> print(make_incrementor(22)(23)) 45

  7. Examples of Use – Lists >>> S = [x**2 for x in range(10)] >>> V = [2**i for i in range(13)] >>> M = [x for x in S if x % 2 ==0] >>> print(S); print(V); print(M) [0, 1, 4, 9, 16, 25, 36, 49, 64, 81] [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096] [0, 4, 16, 36, 64]

  8. Examples of Use – Classes >>> class MyClass: ... # A simple example class … i= 12345 … deff(self): … return “Hello, world.” … >>> x = Myclass() >>> x.f() Hello, world.

  9. Comparison - Ruby • Both imperative/functional, object oriented, & interpreted • Python emphasizes a single best way, and features extensive standard libraries • Ruby emphasizes elegant syntax & greater object-orientation

  10. Comparison – C++ • Both object-oriented, imperative languages • C++ compiled to hardware native code; Python compiled to bytecode, executed by VM • Both languages are flexible in terms of object-orientation.

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