pythonのお勉強その４ list

listは更新可能なコレクション
[]で囲んで初期化する

>>> list = ["letitride", "-", "jp", ".", "net"]
>>> print list
['letitride', '-', 'jp', '.', 'net']
>>> for i in list:
...     print i
... 
letitride
-
jp
.
net
>>> #末尾に値を追加
>>> list = []
>>> list.append("let")
>>> list.append("it")
>>> list.append("ride")
>>> print list
['let', 'it', 'ride']
>>> #indexを指定して要素を挿入
>>> list = ["letitride","jp","."]
>>> list.insert(1, "-")
>>> list.insert(3, "net")
>>> print list
['letitride', '-', 'jp', 'net', '.']
>>> #指定の値の要素を削除(最初に見つかった要素のみ)
>>> list =  ["1","2","3","2","1"]
>>> list.remove("2")
>>> print list  
['1', '3', '2', '1']
>>> #指定要素の値を取り出し
>>> list = ["1","2","3","2","1"]
>>> print list.pop(1)
2
>>> print list.pop()
1
>>> print list
['1', '3', '2']
>>> #指定の値のindexを取得(最初に見つかった要素)
>>> list = ["100","200","300","200","100"]
>>> print list.index("200")
1
>>> #list内に含まれる指定値の件数を取得
>>> list = ["100","200","300","200","100"]
>>> print list.count("200")
2
>>> #指定の値の要素すべてを削除j
>>> for i in range( list.count("200")):
...     list.remove("200")
... 
>>> print list
['100', '300', '100']