Day5：Python基础：字典方法一

1、字典增加键值

Dic = {'Age':18, 'Name':'Jie', 'Sex':'male'}
#增
Dic ['High'] = 160
print(Dic)

2、字典键值修改

Dic = {'Age':18, 'Name':'Jie', 'Sex':'male'}
#增
Dic ['High'] = 160
print(Dic)
#改
Dic ['Age'] = 100
print(Dic)

3、字典Setdefault（有键值不做任何改变，无增加）

Dic = {'Age':18, 'Name':'Jie', 'Sex':'male'}
#增
Dic ['High'] = 160
print(Dic)

Dic ['Age'] = 100
print(Dic)

Dic.setdefault('Weight') /**无增加**/
print(Dic)

Dic = {'Age':18, 'Name':'Jie', 'Sex':'male'}
#增
Dic ['High'] = 160
print(Dic)

Dic ['Age'] = 100
print(Dic)

Dic.setdefault('Weight')
print(Dic)

Dic.setdefault('Name','SB')
print(Dic)
-----------------------------------------------------

{'Age': 18, 'Name': 'Jie', 'Sex': 'male', 'High': 160}
{'Age': 100, 'Name': 'Jie', 'Sex': 'male', 'High': 160}
{'Age': 100, 'Name': 'Jie', 'Sex': 'male', 'High': 160, 'Weight': None}
{'Age': 100, 'Name': 'Jie', 'Sex': 'male', 'High': 160, 'Weight': None}