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p2004a/Python part 1.ipynb

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Python tutorial for programmers
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Python part 1.ipynb
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Python part 2.ipynb
{
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Python cz\u0119\u015b\u0107 2"
]
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"List/Set/Dict comprehensions"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"[x*x for x in range(5)]"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 1,
"text": [
"[0, 1, 4, 9, 16]"
]
}
],
"prompt_number": 1
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"{x for x in range(5)}"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 2,
"text": [
"{0, 1, 2, 3, 4}"
]
}
],
"prompt_number": 2
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"{2 for x in range(5)}"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 3,
"text": [
"{2}"
]
}
],
"prompt_number": 3
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"{x: x*x for x in range(5)}"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 4,
"text": [
"{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}"
]
}
],
"prompt_number": 4
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"{i: x*x for x in range(5) for i in range(5)}"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 5,
"text": [
"{0: 16, 1: 16, 2: 16, 3: 16, 4: 16}"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Formatowanie string\u00f3w w starym stylu"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"asd\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 6,
"text": [
"'asd'"
]
}
],
"prompt_number": 6
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"asd %d\" % 5"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 7,
"text": [
"'asd 5'"
]
}
],
"prompt_number": 7
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"asd %04d %s\" % (1,\"asd\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 8,
"text": [
"'asd 0001 asd'"
]
}
],
"prompt_number": 8
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"asd %(alfa)s %(beta)s\" % {'alfa': \"31\", 'beta': \"123\"}"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 9,
"text": [
"'asd 31 123'"
]
}
],
"prompt_number": 9
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Formatowanie string\u00f3w w nowym stylu\n",
"\n",
"Opis format string\u00f3w https://docs.python.org/3.4/library/string.html#format-string-syntax"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"{} ma {}\".format(\"ala\", \"kota\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 10,
"text": [
"'ala ma kota'"
]
}
],
"prompt_number": 10
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"{kto} ma {co}\".format(kto=\"ala\", co=\"kota\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 11,
"text": [
"'ala ma kota'"
]
}
],
"prompt_number": 11
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"{0} ma {1}\".format(\"kota\", \"ala\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 12,
"text": [
"'kota ma ala'"
]
}
],
"prompt_number": 12
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"'{0:<10}' '{0:>10}' '{0:^10}'\".format(\"asd\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 13,
"text": [
"\"'asd ' ' asd' ' asd '\""
]
}
],
"prompt_number": 13
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"{0[a]} {0[a][0]}\".format({'a': [1,2,3]})"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 14,
"text": [
"'[1, 2, 3] 1'"
]
}
],
"prompt_number": 14
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import string\n",
"\"{0.ascii_letters}\".format(string)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 15,
"text": [
"'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'"
]
}
],
"prompt_number": 15
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\"{0[a]:{1}10}\".format({'a': \"asd\"}, '>')"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 16,
"text": [
"' asd'"
]
}
],
"prompt_number": 16
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"\"Prawdziwo\u015b\u0107\" obiekt\u00f3w"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"if [1,2,2]:\n",
" print(\"TAK\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"TAK\n"
]
}
],
"prompt_number": 17
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"if []:\n",
" print(\"TAK\")\n",
"else:\n",
" print(\"NIE\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"NIE\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Kolekcje\n",
"\n",
"Opr\u00f3cz standardowych set\u00f3w, list i dict\u00f3w wiele przydatnych znajduje si\u0119 z module `collections` https://docs.python.org/3.4/library/collections.html.\n",
"Przede wszystim polecam spojrze\u0107 na `namedtuple`."
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Klasy"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class F(object):\n",
" def dodaj(self, a, b):\n",
" return a + b\n",
"\n",
"a = F()\n",
"print(a.dodaj(1,2))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
}
],
"prompt_number": 19
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class Dodawacz(object):\n",
" def __init__(self, a):\n",
" self.a = a\n",
" \n",
" def dodaj(self, b):\n",
" return self.a + b\n",
" \n",
"a = Dodawacz(5)\n",
"print(a.dodaj(10))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"15\n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Iteratory"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def urange(n):\n",
" while n > 0:\n",
" yield n\n",
" n -= 1\n",
" \n",
"print(type(urange(10)))\n",
"for i in urange(10):\n",
" print(i)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"<class 'generator'>\n",
"10\n",
"9\n",
"8\n",
"7\n",
"6\n",
"5\n",
"4\n",
"3\n",
"2\n",
"1\n"
]
}
],
"prompt_number": 21
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def rrange(n):\n",
" class RRange(object):\n",
" def __init__(self, n):\n",
" self.n = n\n",
" \n",
" def __iter__(self):\n",
" return self\n",
" #return range(10).__iter__()\n",
" \n",
" def __next__(self):\n",
" if self.n <= 0:\n",
" raise StopIteration\n",
" n = self.n\n",
" self.n -= 1\n",
" return n\n",
" \n",
" return RRange(n)\n",
"\n",
"print(type(rrange(10)))\n",
"\n",
"for i in rrange(10):\n",
" print(i)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"<class '__main__.rrange.<locals>.RRange'>\n",
"10\n",
"9\n",
"8\n",
"7\n",
"6\n",
"5\n",
"4\n",
"3\n",
"2\n",
"1\n"
]
}
],
"prompt_number": 22
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Obiekt `locals`\n",
"\n",
"Do obiektu `locals` analogiczny jest obiekt `globals`."
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def f():\n",
" a = 10\n",
" b = 5\n",
" return locals()\n",
"\n",
"x = f()\n",
"print(x['a'])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"10\n"
]
}
],
"prompt_number": 23
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Metody instancji, klasy i statyczne"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class PPP(object):\n",
" def public(self):\n",
" pass\n",
" \n",
" def _protected(self):\n",
" pass\n",
" \n",
" def __pivate(self):\n",
" pass"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 24
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class StaticMethods(object):\n",
" @staticmethod\n",
" def func(a, b):\n",
" \"dokumentcja funkcji\"\n",
" return a + b\n",
" \n",
"print(StaticMethods.func(2,4))\n",
"print(StaticMethods.func.__doc__)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"6\n",
"dokumentcja funkcji\n"
]
}
],
"prompt_number": 25
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class CM(object):\n",
" a = {'a': 10}\n",
"\n",
" @classmethod\n",
" def f(cls):\n",
" print(cls, cls.a)\n",
"\n",
" def inc_a(self):\n",
" self.a['a'] += 1\n",
" return self.a['a']\n",
"\n",
"CM.f()\n",
"\n",
"a = CM()\n",
"b = CM()\n",
"\n",
"print(a.inc_a())\n",
"print(b.inc_a())"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"<class '__main__.CM'> {'a': 10}\n",
"11\n",
"12\n"
]
}
],
"prompt_number": 26
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Przeci\u0105\u017canie operator\u00f3w\n",
"\n",
"Najbardziej og\u00f3lnie: https://docs.python.org/3.4/reference/datamodel.html#special-method-names\n",
"\n",
"Co do samych operator\u00f3w arytmetycznych: https://docs.python.org/3.4/reference/datamodel.html#emulating-numeric-types"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class Liczba(object):\n",
" def __init__(self, n):\n",
" super().__init__()\n",
" self.n = n\n",
"\n",
" def __add__(self, rhs):\n",
" if type(rhs) is not Liczba:\n",
" rhs = Liczba(rhs)\n",
" return Liczba(self.n + rhs.n)\n",
" \n",
" def __radd__(self, lhs):\n",
" return self + lhs\n",
"\n",
" def __str__(self):\n",
" return str(self.n)\n",
" \n",
" def __iadd__(self, n):\n",
" print(\"asd\")\n",
" self.n += n\n",
" return self\n",
" \n",
" def __getitem__(self, n):\n",
" return (self.n & (1 << n)) >> n\n",
"\n",
" def __iter__(self):\n",
" for i in range(10):\n",
" yield self[i]\n",
" \n",
"a = Liczba(2)\n",
"b = Liczba(3)\n",
"\n",
"print(a)\n",
"a += 2\n",
"print(a)\n",
"\n",
"print(a + b)\n",
"print(a + 9)\n",
"print(9 + a)\n",
"\n",
"print(a[0], a[1])\n",
"\n",
"print(list(a))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n",
"asd\n",
"4\n",
"7\n",
"13\n",
"13\n",
"0 0\n",
"[0, 0, 1, 0, 0, 0, 0, 0, 0, 0]\n"
]
}
],
"prompt_number": 27
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 27
}
],
"metadata": {}
}
]
}
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Python part 3.ipynb
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Python part 4.ipynb
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