Python入門
リスト内包表記

リスト変数 = [式 for 変数 in イテラブル]

リスト変数 = []
for 変数 in イテラブル:
    リスト変数.append(式)

リスト変数 = [式 for 変数 in イテラブル if 条件式]

リスト変数 = []
for 変数 in イテラブル:
    if 条件式:
        リスト変数.append(式)
print(subs)
print(ary)

lang = ["Python","VBA","GAS","Java","C","JavaScript"]
subs = [s for s in lang if "a" in s.lower()]
print(subs)

lang = ["Python","VBA","GAS","Java","C","JavaScript"]
subs = []
for s in lang:
    if "a" in s.lower():
        subs.append(s)
print(subs)

lang = ["Python","VBA","GAS","Java","C","JavaScript"]
subs = filter(lambda s:s if "a" in s.lower() else None, lang)
print(list(subs))

#リスト内包表記
ary = [i for i in range(1,11) if i % 3 == 0]
print(ary)

#for文
ary = []
for n in range(1, 11):
    if n % 3 == 0:
        ary.append(n)
print(ary)

#ラムダ式とfilter()関数
ary = list(filter(lambda i:i if i % 3 == 0 else None, range(1,11)))
print(ary)

#リスト内包表記
ary = [i * 3 if i % 3 == 0 else i * 2 for i in range(1,11)]
print(ary)

#for文
ary = []
for n in range(1,11):
    if n % 3 == 0:
        ary.append(n * 3)
    else:
        ary.append(n * 2)
print(ary)

#ラムダ式とmap関数
ary = list(map(lambda i:i * 3 if i % 3 == 0 else i * 2, range(1,11)))
print(ary)

リスト変数 = [式 for 変数1 in イテラブル1 for 変数2 in イテラブル2]

リスト変数 = [式 for 変数1 in イテラブル1 
                    for 変数2 in イテラブル2]

リスト変数 = []
for 変数1 in イテラブル1:
    for 変数2 in イテラブル2:
        リスト変数.append(式)

ary = [(x, y) for x in range(1, 4) for y in range(1, 3)]
print(ary)

ary = []
for x in range(1, 4):
    for y in range(1, 3):
        ary.append((x, y))
print(ary)

s = "VBA"
combi = [x+y+z for x in s for y in s for z in s if x != y != z != x]
print(combi)

s = "VBA"
combi = []
for x in s:
    for y in s:
        for z in s:
            if x != y != z != x:
                combi.append(x+y+z)
print(combi)

row, col = 5, 4

#2次元配列作成
ary2 = [[(r - 1) * col + c for c in range(1, col + 1)] for r in range(1, row + 1)]
print(ary2)

#1次元配列に変換
ary1 = [c for r in ary2 for c in r]
print(ary1)

#2次元配列に変換
ary2 = [ary1[i:i + col] for i in range(0, len(ary1), col)]
print(ary2)

row, col = 5, 4

#2次元配列作成
ary2 = []
for r in range(1, row + 1):
    ary2.append([])
    for c in range(1, col + 1):
        ary2[r-1].append((r - 1) * col + c)
print(ary2)

#1次元配列に変換
ary1 = []
for r in ary2:
    for c in r:
        ary1.append(c)
print(ary1)

#2次元配列に変換
ary2 = []
for i in ary1:
    if i % col == 1:
        ary2.append(ary1[i-1:i-1+col])
print(ary2)

s = "Python"
combi = [(s1, s2) for s1, s2 in zip(s, s[::-1])]
print(combi)

combi = []
for s1, s2 in zip(s, s[::-1]):
    combi.append((s1, s2))
print(combi)

{i for i in range(1, 11)}

{i: c for i, c in zip((1,2,3,4,5),"ABCDE")}