備忘録（Python）

Python

String[i:j]

文字列を切り出す

word = "hello world"
word[2:6]
=> 'llo '
word[:3]
=> 'hel'
word[9:]
=> 'ld'
word[:]
=> 'hello world'
word[-5:-1]
=> 'world'
word[2:2]
=> ''

値 in List

Listが値を要素に含むかどうか

l = ['aaa', 'bbb']
'aaa' in l
=> True
'ccc' in l
=> False

List.extend(List)

Listを結合

l1 = ['aaa', 'bbb']
l2 = ['ccc', 'ddd']
l1.extend(l2)
print(l1)
=> ['aaa', 'bbb', 'ccc', 'ddd']

del List[i:j]

Listのインデックスが[i, j)の要素を削除

l = ['aaa', 'bbb', 'ccc']
del l[1:2]
print(l)
=> ['aaa', 'ccc']