1.zip平行遍歷操作
1 >>> name=('jack','beginman','sony','pcky')
2 >>> age=(2001,2003,2005,2000)
3 >>> for a,n in zip(name,age):
4print a,n
5 6輸出:
7 jack 2001
8 beginman 2003
9 sony 2005
10 pcky 2000
2.zip構建字典
keys = ['spam','eggs','toast']
vals = [1,3,5]
D3 = dict(zip(keys,vals))
D3 = {'toast': 5, 'eggs': 3, 'spam': 1}
3.列操作
zip()配合*號操作符,可以將已經zip過的列表對象解壓
>>> result
9 [(1, 4), (2, 5), (3, 6)]
>>> zip(*result)
2 [(1, 2, 3), (4, 5, 6)]
如果要將一個string list轉換成int list (list裏每個string都轉成int),比如
[python]
['0','1','2'] -> [0,1,2]
可以使用:
[python]
[int(x) for x in list]
或者使用map操作: map(func, list) 對list裏的每個元素apply func.
[python]
map(int, list)
假設有一個2維數組(用list實現):
[python]
list = [[0,1,2],[3,1,4]]
如果要得到每行之和,可以用以下兩種方式:
[python]
>>> list = [[0,1,2],[3,1,4]]
>>> [sum(x) for x in list]
[3, 8]
>>> map(sum,list)
[3, 8]