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Python for switch-heads

MB

Max Baryshnikov

Transcript

  • Beautiful is better than ugly.
  • Explicit is better than implicit.
  • Simple is better than complex.
  • Complex is better than complicated.
  • Flat is better than nested.
  • Sparse is better than dense.
  • Readability counts.
  • Special cases aren't special enough to break the rules.
  • ...

Write once, run everywhere

?

Syntax and semantics

Data types

Primitives:

  • byte, short, int, long, float, double, boolean, char

Java collections framework

  • Immutable types?
  • lists? tuples? dicts? sets? in PHP these are Array!

  • In PHP we have: boolean, int, float, string, array, object, resource, null

P.S. Standart PHP Library (SPL)

OOP

  • Multiple inheritance
  • No interfaces
  • No abstract classes and methods
  • No access specifiers

  • Even class is an object
  • __metaclass__

  • Multiple inheritance: huh?
  • No interfaces: WTF?
  • No abstract classes and methods: WTF?
  • No access specifiers: WTF?

  • Even class is an object: ?
  • __metaclass__: WTF?

  • Multiple inheritance: huh?
  • No interfaces: WTF?
  • No abstract classes and methods: WTF?
  • No access specifiers: WTF?

  • Even class is an object: ah?
  • __metaclass__: WTF?

Threading

Performance

Conclusion

Python for switch-heads

1991

1995

PEP #20: Zen of Python

  • duck typing

  • whitespace intendation
  • frequently using English keywords where other languages use punctuation: x if true else y

  • list comprehensions
  • index and slice expressions [start:stop:step]
  • statements and expressions distinction:

if a=1: ... #error

  • duck typing: WTF?

  • whitespace intendation: WTF?

  • statements and expressions distinction: ok

  • duck typing: ok

  • whitespace intendation: WTF?

  • statements and expressions distinction: ok, mostly just prevents errors

Immutable

  • str, bytes, tuple, frozenset, int, float, complex, bool

Mutable

  • bytearray, list, set, dict

P.S. Everything is an object, and we have collections package

WTF???

  • No threading in PHP, so I don't care

P.S. ...yes, I know about PECL threads

  • Global Interpreter Lock (GIL)
  • but there's threading API

  • async framorks try to "pack" work in CPU using threading API

interpreted, compiles to bytecode, JIT compiler

  • interpreted, compiles to bytecode (*.pyc), resuses compiled *.pyc's
  • there are several runtimes available: CPython, Jython, PyPy, IronPython...

  • there are tricks: sorting, string concatenation, dot dereferencing, etc

P.S. see CPython sources for details

interpreted, number of opcode cachers available

Python is OK, but I'll miss Java*

*P.S. Java4ever =)

Python is great! I'm switching!*

*denotes most common reaction =)

May the force be with you

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