# lesson21: リスト3（授業練習用）
###### tags: `練習用`
:::warning
## スライドにあるコードを練習しよう。自分が書いたコードをコピーし、実行した結果をスクリーンショットしてHackMDに貼り付けてください。

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## 例：
:::info
Code:

r = float(input("Please input value r:"))
r_Round = r * 2 * 3.14
r_Area = r * r * 3.14
print("The round:", r_Round)
print("The area:", r_Area)

結果：
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## 1.
:::info
Code:

intlist = [-7, 8, 3, -5, -3, 2, 10, 6, -12, -8]
intlist.sort()
print(intlist)

intlist.sort(reverse = True)
print(intlist)

結果：

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## 2.
:::info
Code:

languages = ["Python", "c++", "Java"]
print(languages)
languages.insert(1, "PHP")
print(languages)

結果：

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## 3.
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Code:

languages = ["Python", "c++", "Java","PHP"]
print(languages)
copy_languages = languages.copy()
print(copy_languages)

結果：

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## 4.
:::info
Code:

a = [1, 2, 3]
c = [1, 2, 3]
b = a

c[1] = 7

b[1] = 5

print("a = {}, b = {}, c = {}". format(a, b, c))

結果：
a = [1, 5, 3], b = [1, 5, 3], c = [1, 7, 3]

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## 5.

:::info
Code:

a = [1, 2, 3]
b = []
for x in a:
    b.append(x)
print("a = {}, b = {}". format(a, b))

b[1] = 7
print("a = {}, b = {}". format(a, b))

結果：
a = [1, 2, 3], b = [1, 2, 3]
a = [1, 2, 3], b = [1, 7, 3]

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## 6.
:::info
Code:

a = [1, 2, 3]
b = a.copy()
print("a = {}, b = {}". format(a, b))

b[1] = 7
print("a = {}, b = {}". format(a, b))

結果：
a = [1, 2, 3], b = [1, 2, 3]
a = [1, 2, 3], b = [1, 7, 3]

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## 7.
:::info
Code:

languages = ['Python', 'c++', 'Java']
str = input ("input str : ")

if str in languages:
    print("{} is in the list". format(str))
else:
    print("{} is not in the list". format(str))

結果：

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## 8.
:::info
Code:

結果：

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## 9.
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Code:

結果：

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## 10.

:::info
Code:

結果：

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