c10b-python-funkcje-args-lekcja.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Python: Funkcje - argumenty i parametry"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "* czym różnią się parametry i argumenty?\n",
    "* argument - wartość przekazywana do funkcji\n",
    "* parametr - zmienna która odbiera wartości podawane do funkcji"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Parametry funkcji\n",
    "\n",
    "\n",
    "* składnia\n",
    "* parametry wymagane\n",
    "* parametry opcjonalne\n",
    "* przykłady użycia\n",
    "* `*args` i `**kwargs`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "def echo(text):\n",
    "    print(text)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "def echo(text='hello'):\n",
    "    print(text)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(a, b):\n",
    "    return a + b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(a=1, b=2):\n",
    "    return a + b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(a, b=2):\n",
    "    return a + b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(a, b, c, d, e, f, ...):\n",
    "    return a + b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(*args):\n",
    "    return args"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(*kwargs):\n",
    "    return args"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Argumenty funkcji\n",
    "\n",
    "* składnia\n",
    "* argumenty pozycyjne (positional)\n",
    "* argumenty nazwane (keyword)\n",
    "* argumenty pozycyjne i nazwane\n",
    "* `*args` i `**kwargs`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hello\n"
     ]
    },
    {
     "ename": "TypeError",
     "evalue": "echo() missing 1 required positional argument: 'text'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-10-5db042fbd925>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      3\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      4\u001b[0m \u001b[0mecho\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'hello'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mecho\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m: echo() missing 1 required positional argument: 'text'"
     ]
    }
   ],
   "source": [
    "def echo(text):\n",
    "    print(text)\n",
    "    \n",
    "echo('hello')\n",
    "echo()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "positional argument follows keyword argument (<ipython-input-14-0b4eb0b746e2>, line 13)",
     "output_type": "error",
     "traceback": [
      "\u001b[0;36m  File \u001b[0;32m\"<ipython-input-14-0b4eb0b746e2>\"\u001b[0;36m, line \u001b[0;32m13\u001b[0m\n\u001b[0;31m    add(a=1, 2)\u001b[0m\n\u001b[0m             ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m positional argument follows keyword argument\n"
     ]
    }
   ],
   "source": [
    "def add(a, b):\n",
    "    return a + b\n",
    "\n",
    "add(1, 2)\n",
    "add(2, 1)\n",
    "\n",
    "add(a=1, b=2)\n",
    "add(b=2, a=1)\n",
    "\n",
    "add(1, b=2)\n",
    "\n",
    "add(1, a=2)\n",
    "add(a=1, 2)\n",
    "add(b=1, 2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hello\n",
      "hello\n"
     ]
    },
    {
     "ename": "TypeError",
     "evalue": "echo() missing 1 required positional argument: 'text'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-17-e2ca1ed97716>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      4\u001b[0m \u001b[0mecho\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'hello'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      5\u001b[0m \u001b[0mecho\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtext\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;34m'hello'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 6\u001b[0;31m \u001b[0mecho\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m: echo() missing 1 required positional argument: 'text'"
     ]
    }
   ],
   "source": [
    "def echo(text):\n",
    "    print(text)\n",
    "    \n",
    "echo('hello')\n",
    "echo(text='hello')\n",
    "echo()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "haha\n",
      "haha\n",
      "hello\n"
     ]
    }
   ],
   "source": [
    "def echo(text='hello'):\n",
    "    print(text)\n",
    "    \n",
    "echo('haha')\n",
    "echo(text='haha')\n",
    "echo()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "6450"
      ]
     },
     "execution_count": 26,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def sumuj(*args):\n",
    "    return sum(args)\n",
    "    \n",
    "sumuj(1,2,3,5,6,62,3,4234,2134)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "92"
      ]
     },
     "execution_count": 33,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def sumuj(**kwargs):\n",
    "    return sum(kwargs.values())\n",
    "    \n",
    "sumuj(a=1, b=2, c=89)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [],
   "source": [
    "def echo(a, b=0, *args, **kwargs):\n",
    "    print(a)\n",
    "    print(b)\n",
    "    print(args)\n",
    "    print(kwargs)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "0\n",
      "()\n",
      "{}\n"
     ]
    }
   ],
   "source": [
    "echo(1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "()\n",
      "{}\n"
     ]
    }
   ],
   "source": [
    "echo(1, 2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "()\n",
      "{}\n"
     ]
    }
   ],
   "source": [
    "echo(1, b=2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "()\n",
      "{}\n"
     ]
    }
   ],
   "source": [
    "echo(a=1, b=2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "()\n",
      "{'c': 10}\n"
     ]
    }
   ],
   "source": [
    "echo(a=1, b=2, c=10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "(3,)\n",
      "{}\n"
     ]
    }
   ],
   "source": [
    "echo(1, 2, 3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "(3, 4, 5, 6)\n",
      "{}\n"
     ]
    }
   ],
   "source": [
    "echo(1, 2, 3, 4, 5, 6)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "(3, 4, 5, 6)\n",
      "{'x': 7, 'y': 8, 'z': 9}\n"
     ]
    }
   ],
   "source": [
    "echo(1, 2, 3, 4, 5, 6, x=7, y=8, z=9)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "(3, 4, 5, 6)\n",
      "{'x': 7, 'y': 8, 'z': 9}\n"
     ]
    }
   ],
   "source": [
    "echo(1, 2, 3, 4, 5, 6, x=7, y=8, z=9)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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