method_and_class.ipynb

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    "## メソッド method\n",
    "\n",
    "* 処理をひとまとまりにして使いやすくする、再利用する。\n",
    "* メソッドを利用する時は必ず `method_name()` のように最後に`()`が来る。引数がなくても必要。\n",
    "* methodには引数と返り値というものがある。argumentsとreturn 。"
   ]
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     "text": [
      "60\n",
      "90\n"
     ]
    }
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   "source": [
    "def total(arr):\n",
    "    total = 0\n",
    "    for n in arr:\n",
    "        total += n\n",
    "    return total\n",
    "\n",
    "print(total([10, 20, 30]))\n",
    "print(total([10, 30, 50]))\n",
    "# print(total(['a', 'b', 'c']))"
   ]
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   "cell_type": "markdown",
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    "\n"
   ]
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     "text": [
      "capitalize\n",
      "casefold\n",
      "center\n",
      "count\n",
      "encode\n",
      "endswith\n",
      "expandtabs\n",
      "find\n",
      "format\n",
      "format_map\n",
      "index\n",
      "isalnum\n",
      "isalpha\n",
      "isdecimal\n",
      "isdigit\n",
      "isidentifier\n",
      "islower\n",
      "isnumeric\n",
      "isprintable\n",
      "isspace\n",
      "istitle\n",
      "isupper\n",
      "join\n",
      "ljust\n",
      "lower\n",
      "lstrip\n",
      "maketrans\n",
      "partition\n",
      "replace\n",
      "rfind\n",
      "rindex\n",
      "rjust\n",
      "rpartition\n",
      "rsplit\n",
      "rstrip\n",
      "split\n",
      "splitlines\n",
      "startswith\n",
      "strip\n",
      "swapcase\n",
      "title\n",
      "translate\n",
      "upper\n",
      "zfill\n"
     ]
    }
   ],
   "source": [
    "# strのmethodの一覧\n",
    "for method in dir(str):\n",
    "    if not method.startswith('__'):\n",
    "        print(method)"
   ]
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  {
   "cell_type": "code",
   "execution_count": 50,
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   "outputs": [],
   "source": [
    "# 使う時は、class_instance.method() のようにする。\n",
    "s = 'Hello World'"
   ]
  },
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   "execution_count": 51,
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   "outputs": [
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     "text": [
      "upper() 引数: なし、 返り値: str\n",
      "HELLO WORLD\n"
     ]
    }
   ],
   "source": [
    "print('upper() 引数: なし、 返り値: str')\n",
    "print(s.upper())\n"
   ]
  },
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   "cell_type": "code",
   "execution_count": 52,
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   "outputs": [
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     "text": [
      "lower() 引数：なし 戻り値: str\n",
      "hello world\n"
     ]
    }
   ],
   "source": [
    "print('lower() 引数：なし 戻り値: str')\n",
    "print(s.lower())\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "metadata": {
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   "outputs": [
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     "name": "stdout",
     "output_type": "stream",
     "text": [
      "replace() 引数：1: str, 2: str 戻り値: str\n",
      "HellX WXrld\n"
     ]
    }
   ],
   "source": [
    "print('replace() 引数：1: str, 2: str 戻り値: str')\n",
    "print(s.replace('o', 'X'))\n"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   "source": []
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