Python: Related Operations on dictionaries

>>> people = {"Tom": 175, "Jack": "Kite": "White": "#定义一个字典
>>> for name in people: #获取value的值
Print People[name]

180
160
175
170
>>> for name in people: #获取key的值
Print Name

White
Kite
Jack
Tom
>>> People.keys () # Gets the value of all keys, just like the For loop results above
[' White ', ' Kite ', ' Jack ', ' Tom ']
>>> people.values () # Gets the value of all values, as in the For loop result above
[180, 160, 175, 170]
>>> People.has_key ("white") #判断字典中是否存在该键
True
>>> people["Tom"] #通过key去获取value
170
>>> print [i-I in people if people.get (i) = = 175] #通过value去获取key, a code is done.
[' Jack ']
>>> Print [i * 2 for I in people if people.get (i) = = 175] #让输出的值重复两次
[' Jackjack ']
>>> Print [(i + ") * 2 for I in people if people.get (i) = = 175] #给重复的结果中间插入空格
[' Jack Jack ']
>>> def Test ():
print [i-I in people if people.get (i) = = 175] #把该代码定义成一个函数test ()

>>> Test ()
[' Jack ']
>>> def test01 (SG): #把该代码定义为有参的函数test01 ()
print [i-I in people if people.get (i) = = sg]

>>> test01 (175)
[' Jack ']

Python: Related Operations on dictionaries