问题: (1)既然元祖是可以作为key的 那么是应用在什么情况下? (2)如何添加字典的项, 还是说原来有多少key,就只能放入多少value,而不能增加key的数目?
d ={ 'Michael':95, 'Bob':75, 'Tracy':85 }
print('d[\'Michael\']=',d['Michael']) print('d[\'Bob\'] =',d['Bob']) print('d[\'Tracy\']=',d['Tracy']) print('d.get(\'Thomas\',-1)=',d.get('Thomas',-1))
s1 =set([1,1,2,2,3,3]) print(s1) s2 =set([2,3,4]) print(s1 & s2) print(s1 | s2)
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翁岚敏
问题: (1)既然元祖是可以作为key的 那么是应用在什么情况下? (2)如何添加字典的项, 还是说原来有多少key,就只能放入多少value,而不能增加key的数目?
the_dict.py
!/usr/bin/env python3
-- coding:utf-8 --
d ={ 'Michael':95, 'Bob':75, 'Tracy':85 }
print('d[\'Michael\']=',d['Michael']) print('d[\'Bob\'] =',d['Bob']) print('d[\'Tracy\']=',d['Tracy']) print('d.get(\'Thomas\',-1)=',d.get('Thomas',-1))
the_set.py
!/usr/bin/env python3
-- coding:utf-8 --
s1 =set([1,1,2,2,3,3]) print(s1) s2 =set([2,3,4]) print(s1 & s2) print(s1 | s2)