面倒なことはPython にやらせよう chapter 演習

3_11.py

# コラッツ予想
# コンソールアプリ
def collatz(v):
    if v % 2 == 0:
        return int(v / 2)
    else:
        return v * 3 + 1


while True:
    try:
        print("Input start value (end with empty):")
        value = input()

        if len(value) == 0:
            break

        print("Start collatz")
        r = int(value)
        while r != 1:
            r = collatz(r)
            print(r)
    except Exception as e:
        print("Except error: " + str(e))
        print("Was input bad value?")

print("Bye!")

4_10_1.py

# 任意長の文字のリストを渡して、基本 「,」 でJOINして、最後だけ and 結合する関数
def join_as_and(messages):
    counts = len(messages)
    if counts == 0:
        return ""
    elif counts == 1:
        return messages[0]
    else:
        last = messages[-1]
        return ", ".join(messages[:-1]) + " and " + last

print(join_as_and(["A", "B", "C"]))

4_10_2.py

# 次のリストを 90 度反転して表示

love = [[' ',' ',' ',' ',' ',' '],
        [' ','0','0',' ',' ',' '],
        ['0','0','0','0',' ',' '],
        ['0','0','0','0','0',' '],
        [' ','0','0','0','0','0'],
        ['0','0','0','0','0',' '],
        ['0','0','0','0',' ',' '],
        [' ','0','0',' ',' ',' '],
        [' ',' ',' ',' ',' ',' ']]

for x in range(6):
    for y in range(9):
        print(love[y][x], end='')
    print()

5_6_1.py

items = {
    'ロープ': 1,
    'たいまつ': 6,
    '金貨': 42,
    '手裏剣': 1,
    '矢': 12
}


def show_items(data):
    for key in data.keys():
        print("%-6s : %d" % (key, data[key]))

show_items(items)

5_6_2.py

inventory = {
    'ロープ': 1,
    'たいまつ': 6,
    '金貨': 42,
    '手裏剣': 1,
    '矢': 12
}


def show_items(data):
    for key in data.keys():
        print("%-6s : %d" % (key, data[key]))


def add_to_inventory(inventory, add_items):
    for itm in add_items:
        if itm in inventory.keys():
            inventory[itm] += 1
        else:
            inventory[itm] = 1


show_items(inventory)
add_to_inventory(inventory, ['金貨', '矢'])
print('add finished'.ljust(20, '-'))
show_items(inventory)

6_7.py

# 以下のリストを 4 行 3 列全て右揃えで列挙してください
table_data = [
    ['apple', 'orange', 'cherries', 'banana'],
    ['Alice', 'Bob', 'Carol', 'David'],
    ['dogs', 'cats', 'mouse', 'goose']
]

col_length = {}

for r in range(3):
    if r not in col_length.keys():
        col_length[r] = 0
    for c in range(4):
        if col_length[r] < len(table_data[r][c]):
            col_length[r] = len(table_data[r][c])

print(col_length)

for c in range(4):
    for r in range(3):
        lens = col_length[r] + 1
        print(table_data[r][c].rjust(lens, ' '), end='')
    print('')