5. 課題解答例¶

課題1¶

なし

課題2¶

In [1]:
def print_args(*args):
    "当たられた位置指定引数を全て出力する"
    for i, val in enumerate(args):
        print("args[{:3d}] = {:s}]".format(i, str(val)))
In [2]:
print_args('hello', (1, 2, 3), [], {'key' : 'val'}, None)

args[  0] = hello]
args[  1] = (1, 2, 3)]
args[  2] = []]
args[  3] = {'key': 'val'}]
args[  4] = None]

課題3¶

In [3]:
def unique(x):
    "与えられたlistから重複した要素を除いたlistを返す"
    y = []
    for xx in x:
        if xx not in y: # 既に要素があるかどうかチェック
            y.append(xx)
    return y
In [4]:
unique(['a', 1, 'b', 2, 'c', 1, 2, 3, 'b', 'd', 'a', 3])
Out[4]:
['a', 1, 'b', 2, 'c', 3, 'd']

課題4¶

In [5]:
def process_kwargs(**kwargs):
    "キーワード引数で与えられた引数を全て出力する"
    # 必須の引数aとbをtupleで指定
    required_keys = 'a', 'b'
    for key in required_keys:
        if key not in kwargs:
            kwargs[key] = None
    # キーでソートする
    keys = list(kwargs.keys())
    keys.sort()
    for key in keys:
        print(key, kwargs[key])
In [6]:
process_kwargs(a='hi', c='chao', x=10, y=20, z=30)

a hi
b None
c chao
x 10
y 20
z 30

課題5¶

In [7]:
# JSON文字列
json_string = \
"""
[
  {
    "age": 28,
    "name": {
      "last": "Morales",
      "first": "Hickman"
    },
    "email": "hickman.morales@electonic.cg",
    "index": 0,
    "company": "Electonic",
    "favoriteFruit": "apple"
  },
  {
    "age": 59,
    "name": {
      "last": "Norris",
      "first": "Emerson"
    },
    "email": "emerson.norris@recrisys.sj",
    "index": 1,
    "company": "Recrisys",
    "favoriteFruit": "strawberry"
  },
  {
    "age": 47,
    "name": {
      "last": "Garza",
      "first": "Shelly"
    },
    "email": "shelly.garza@signity.mw",
    "index": 2,
    "company": "Signity",
    "favoriteFruit": "orange"
  },
  {
    "age": 30,
    "name": {
      "last": "Owens",
      "first": "Rhoda"
    },
    "email": "rhoda.owens@kidgrease.cn",
    "index": 3,
    "company": "Kidgrease",
    "favoriteFruit": "strawberry"
  },
  {
    "age": 18,
    "name": {
      "last": "Dodson",
      "first": "Florence"
    },
    "email": "florence.dodson@musanpoly.cy",
    "index": 4,
    "company": "Musanpoly",
    "favoriteFruit": "banana"
  }
]
"""

# jsonモジュールを使う
import json

def process_json1(s):
    "JSON文字列から名前とEmailアドレスを抽出して出力"
    # 文字列からオブジェクトに変換
    json_obj = json.loads(s)
    # 
    for elem in json_obj:
        # 以下念のためチェックするコードを色々いれてあるがこの課題には必要ない
        if not isinstance(elem, dict):
            continue
        if 'name' in elem:
            first = elem.get('name').get('first', '').capitalize()
            last = elem.get('name').get('last', '').upper()
        email = elem.get('email', '')
        print('{:s} {:s} <{:s}>'.format(first, last, email))
In [8]:
process_json1(json_string)

Hickman MORALES <hickman.morales@electonic.cg>
Emerson NORRIS <emerson.norris@recrisys.sj>
Shelly GARZA <shelly.garza@signity.mw>
Rhoda OWENS <rhoda.owens@kidgrease.cn>
Florence DODSON <florence.dodson@musanpoly.cy>

課題6¶

In [9]:
def process_json2(s):
    "JSON文字列から個人情報を削除したJSON文字列として返す"
    # 削除するキーをtupleで与える
    to_be_deleted = 'name', 'email'
    x = []
    for elem in json.loads(s):
        for key in to_be_deleted:
            del elem[key]
        x.append(elem)
    # JSON文字列に変換して返す
    return json.dumps(x, indent=2)
In [10]:
# 返された文字列をそのまま出力
print(process_json2(json_string))

[
  {
    "age": 28,
    "index": 0,
    "company": "Electonic",
    "favoriteFruit": "apple"
  },
  {
    "age": 59,
    "index": 1,
    "company": "Recrisys",
    "favoriteFruit": "strawberry"
  },
  {
    "age": 47,
    "index": 2,
    "company": "Signity",
    "favoriteFruit": "orange"
  },
  {
    "age": 30,
    "index": 3,
    "company": "Kidgrease",
    "favoriteFruit": "strawberry"
  },
  {
    "age": 18,
    "index": 4,
    "company": "Musanpoly",
    "favoriteFruit": "banana"
  }
]
In [ ]: