python collections 數據結構模塊
阿新 • • 發佈:2018-02-05
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namedtuple類
導入模塊
from collections import namedtuple
使用方法及說明
#pycharm 裏按住 ctrl鍵點擊 collections可查看源碼
#collections數據結構 #__all__ = [‘deque‘, ‘defaultdict‘, ‘namedtuple‘, ‘UserDict‘, ‘UserList‘,‘UserString‘, ‘Counter‘, ‘OrderedDict‘, ‘ChainMap‘]
使用說明:
#猜包功能
name = ("lijie",‘ll‘) user = ("aa",23,189,‘boddy‘) username,age,height,edu = userprint (username,age,height,edu)
打印結果:
aa 23 189 boddy
#另一種方法 username,*other = user print (username,other)
打印結果:
aa [23, 189, ‘boddy‘]
tuple 可作為字典的key,而list不可以,示例:
name_tuple = ("test",22,185,"baskerball") name_list = ["test1",22,188,"baseball"] dd = {} dd[name_tuple] = ‘boddy‘ print (dd) dd[name_list] = ‘body‘ print (dd)
打印結果:
{(‘test‘, 22, 185, ‘baskerball‘): ‘boddy‘}
Traceback (most recent call last):
File "D:/python-script/collections_module/chapter1/collection_module.py", line 29, in <module>
dd[name_list] = ‘body‘
TypeError: unhashable type: ‘list‘
python collections 數據結構模塊