1. dictionary format
{name = 'k1', 'v1'
'k2':'v2'
}
Dictionary key is disordered, it is not based on index values, based on key values.
2. Add the elements
The first: dic [ 'k3'] = v3 #key present to modify, add does not exist
The second: dic.setdefault ( 'k4', 'v4') #key exist on the same, there is added
3. Modify
dic [ 'k3'] = v3 #key present to modify
4. Delete
dic.pop（‘k2’）
dock [ 'k2']
dic.popitem () # delete a random key
5. Value
print (dic [ 'k2']) # absent key, given
print (dic.get ( 'k2')) # key, none reported absent
print (dic.get ( 'k2', 'v2')) # absent key, default assignment v2
print (info.keys ()) # Get all the dictionary key value
print (info.values ()) # get the value of all dictionary values
6. Other
dic.clear()
dic1.update (dic2) # dictionary to add content to dic1 in dic2
dic.haskey ( 'k1') # python2 determines whether there is key
print ( 'k1' in dic) # python3 whether there is a dictionary key
k + = 1. k = k + 1 represents