2020-05-10 課題

はじめに

自分用メモ

プログラミングの一般論

イテレーターとジェネレーター

基本

1 つ 1 つ作る？

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xs = range(0, 10)
print(type(xs))
for x in xs:
    print(x)

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<class 'range'>
0
1
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9

Python のジェネレーターの簡単な例

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def my_generator():
    yield 1
    yield 2
    yield 3

gen = my_generator()
print(type(gen))

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<class 'generator'>

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def my_generator():
    yield 1
    yield 2
    yield 3

gen = my_generator()
print(gen.__next__())  # 1
print(gen.__next__())  # 2
print(gen.__next__())  # 3

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3
1
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3

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"""4 回呼ぶと怒られる"""
def my_generator():
    yield 1
    yield 2
    yield 3

gen = my_generator()
gen.__next__()  # 1
gen.__next__()  # 2
gen.__next__()  # 3
gen.__next__()  # StopIteration

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---------------------------------------------------------------------------

StopIteration                             Traceback (most recent call last)

<ipython-input-1-f379ec6e011a> in <module>()
      8 gen.__next__()  # 2
      9 gen.__next__()  # 3
---> 10 gen.__next__()  # StopIteration


StopIteration:

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def my_generator():
    yield 1
    yield 2
    yield 3

gen = my_generator()
for a in gen:
    print(a)

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1
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3

クラス

例

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s_scores = [10, 20, 30, 40, 50] # 国語・数学・英・理科・社会の順
def calc_mean(s_scores):
    return sum(s_scores) / len(s_scores)
s_mean = calc_mean(s_scores)
print(s_mean)

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30.0

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s_scores = {
    "ja": 10,
    "math": 20,
    "eng": 30,
    "science": 40,
    "society": 50
}

def calc_mean(s_scores):
    s_sum = sum([v for v in s_scores.values()])
    return s_sum / len(s_scores)

s_mean = calc_mean(s_scores)
print(s_mean)

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30.0

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class Score():
    def __init__(self, ja, math, eng, sci, soc):
        self.ja = ja
        self.math = math
        self.eng = eng
        self.sci = sci
        self.soc = soc

    def calc_mean(self):
        return (self.ja + self.math + self.eng + self.sci + self.soc) / 5

s = Score(10, 20, 30, 40, 50)
print(s.calc_mean())

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30.0

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class Score():
    def __init__(self, ja, math, eng, sci, soc):
        self.ja = ja
        self.math = math
        self.eng = eng
        self.sci = sci
        self.soc = soc

    def calc_mean(self):
        return (self.ja + self.math + self.eng + self.sci + self.soc) / 5

s1 = Score(10, 20, 30, 40, 50)
print(s1.calc_mean())

s2 = Score(1, 2, 3, 4, 5)
print(s2.calc_mean())

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30.0
3.0

アルゴリズムとデータ構造

アルゴリズムとデータ構造でプログラミングを勉強する

いいところ

自分に合った勉強法・勉強内容を探そう