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Python tutorial for programmers
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{ | |
"metadata": { | |
"name": "", | |
"signature": "sha256:ee3afb478aefea0f63fc531afa4ca37187feb0e1321fb0d1ead85c19689104a3" | |
}, | |
"nbformat": 3, | |
"nbformat_minor": 0, | |
"worksheets": [ | |
{ | |
"cells": [ | |
{ | |
"cell_type": "heading", | |
"level": 1, | |
"metadata": {}, | |
"source": [ | |
"Python cz\u0119\u015b\u0107 4" | |
] | |
}, | |
{ | |
"cell_type": "heading", | |
"level": 3, | |
"metadata": {}, | |
"source": [ | |
"Dekoratory" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"W internecie jest a\u017c za du\u017co miejsc gdzie mo\u017cna przeczyta\u0107 jak to dzia\u0142a." | |
] | |
}, | |
{ | |
"cell_type": "heading", | |
"level": 4, | |
"metadata": {}, | |
"source": [ | |
"Proste dekoratory" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"def wykonajdwarazy(func):\n", | |
" def wrapper(*args, **kwargs):\n", | |
" func(*args, **kwargs)\n", | |
" func(*args, **kwargs)\n", | |
" \n", | |
" return wrapper\n", | |
"\n", | |
"@wykonajdwarazy\n", | |
"def f(n):\n", | |
" print(n)\n", | |
"\n", | |
"f(10)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"10\n", | |
"10\n" | |
] | |
} | |
], | |
"prompt_number": 1 | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"def g(n):\n", | |
" print(\"g\", n)\n", | |
"\n", | |
"g = wykonajdwarazy(g)\n", | |
"\n", | |
"g(1)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"g 1\n", | |
"g 1\n" | |
] | |
} | |
], | |
"prompt_number": 2 | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"@wykonajdwarazy\n", | |
"@wykonajdwarazy\n", | |
"def f(n):\n", | |
" print(n)\n", | |
" \n", | |
"f(10)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"10\n", | |
"10\n", | |
"10\n", | |
"10\n" | |
] | |
} | |
], | |
"prompt_number": 3 | |
}, | |
{ | |
"cell_type": "heading", | |
"level": 4, | |
"metadata": {}, | |
"source": [ | |
"Dekoratory przyjmuj\u0105ce argumenty" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"def my_filter(*args):\n", | |
" def decorator(func):\n", | |
" def wrapper(arg):\n", | |
" if arg in args:\n", | |
" return func(arg)\n", | |
" return None\n", | |
" return wrapper\n", | |
" return decorator\n", | |
"\n", | |
"@my_filter(1,2,3)\n", | |
"def f(n):\n", | |
" print(n)\n", | |
"\n", | |
"f(10)\n", | |
"f(1)\n", | |
"f(5)\n", | |
"f(2)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"1\n", | |
"2\n" | |
] | |
} | |
], | |
"prompt_number": 4 | |
}, | |
{ | |
"cell_type": "heading", | |
"level": 4, | |
"metadata": {}, | |
"source": [ | |
"Dekorowanie klas" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"def c(cls):\n", | |
" class klass(cls):\n", | |
" def __init__(self, *args, **kwargs):\n", | |
" super().__init__(*args, **kwargs)\n", | |
" print(\"init\")\n", | |
" \n", | |
" return klass\n", | |
"\n", | |
"@c\n", | |
"class B:\n", | |
" pass\n", | |
"\n", | |
"a = B()\n" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"init\n" | |
] | |
} | |
], | |
"prompt_number": 5 | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"class D(B):\n", | |
" pass\n", | |
"\n", | |
"d = D()" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"init\n" | |
] | |
} | |
], | |
"prompt_number": 6 | |
}, | |
{ | |
"cell_type": "heading", | |
"level": 3, | |
"metadata": {}, | |
"source": [ | |
"S\u0142\u00f3wka kluczowe `global` i `nonlocal`" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"a = 5\n", | |
"\n", | |
"def f():\n", | |
" global a\n", | |
" a += 1\n", | |
" \n", | |
"f()\n", | |
"f()\n", | |
"f()\n", | |
"print(a)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"8\n" | |
] | |
} | |
], | |
"prompt_number": 7 | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"def f():\n", | |
" counter = 0\n", | |
" \n", | |
" def n():\n", | |
" nonlocal counter\n", | |
" counter += 1\n", | |
" return counter\n", | |
" \n", | |
" return n\n", | |
"\n", | |
"c = f()\n", | |
"\n", | |
"print(c())\n", | |
"print(c())\n", | |
"print(f())\n", | |
"\n", | |
"d = f()\n", | |
"print(d())\n", | |
"print(d())\n", | |
"\n", | |
"print(f()())" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"1\n", | |
"2\n", | |
"<function f.<locals>.n at 0x2b0a4f971f28>\n", | |
"1\n", | |
"2\n", | |
"1\n" | |
] | |
} | |
], | |
"prompt_number": 8 | |
}, | |
{ | |
"cell_type": "heading", | |
"level": 3, | |
"metadata": {}, | |
"source": [ | |
"Adnotacje" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"https://www.python.org/dev/peps/pep-3107/" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"def f(a : 3, b : \"asdasd\", d : 1 = 10) -> \"asdasd\":\n", | |
" \"asdasdasdasd\"\n", | |
" pass\n", | |
"\n", | |
"print(f.__annotations__)\n", | |
"print(f.__doc__)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"{'b': 'asdasd', 'return': 'asdasd', 'd': 1, 'a': 3}\n", | |
"asdasdasdasd\n" | |
] | |
} | |
], | |
"prompt_number": 9 | |
}, | |
{ | |
"cell_type": "heading", | |
"level": 3, | |
"metadata": {}, | |
"source": [ | |
"Deskryptory" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"Polecam artyku\u0142: http://nbviewer.ipython.org/gist/ChrisBeaumont/5758381/descriptor_writeup.ipynb" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"class A:\n", | |
" def __init__(self):\n", | |
" self.a = 0\n", | |
" \n", | |
" @property\n", | |
" def a_plus_one(self):\n", | |
" return self.a + 1\n", | |
" \n", | |
" @a_plus_one.setter\n", | |
" def a_plus_one(self, value):\n", | |
" self.a = value - 1\n", | |
" \n", | |
"a = A()\n", | |
"a.a = 10\n", | |
"print(a.a_plus_one)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"11\n" | |
] | |
} | |
], | |
"prompt_number": 10 | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [ | |
"class D:\n", | |
" def __init__(self, name):\n", | |
" self.name = name\n", | |
" \n", | |
" def __get__(self, obj, cls):\n", | |
" return self.name\n", | |
" \n", | |
" def __set__(self, obj, value):\n", | |
" self.name = value\n", | |
"\n", | |
"\n", | |
"class A:\n", | |
" d = D(\"marek\")\n", | |
"\n", | |
"a = A()\n", | |
"print(a.d)\n", | |
"a.d = 10\n", | |
"print(a.d)\n", | |
"\n", | |
"b = A()\n", | |
"print(a.d)" | |
], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"output_type": "stream", | |
"stream": "stdout", | |
"text": [ | |
"marek\n", | |
"10\n", | |
"10\n" | |
] | |
} | |
], | |
"prompt_number": 11 | |
}, | |
{ | |
"cell_type": "code", | |
"collapsed": false, | |
"input": [], | |
"language": "python", | |
"metadata": {}, | |
"outputs": [], | |
"prompt_number": 11 | |
} | |
], | |
"metadata": {} | |
} | |
] | |
} |
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