>>> a = {'joe' : 85 , 'peter' : 88 , 'jack' : 90} >>> b = dict (joe = 90 , peter = 85 , jack = 88) >>> c = dict ( [ ('joe' , 90) , ('peter' , 85) , ('jack' , 95) ] ) # here argument is a list of tuples >>> print (a) {'joe': 85, 'peter': 88, 'jack': 90} >>> type (a) <class 'dict'> >>> len (a) 3
>>> a['kris'] = 85 >>> print (a) {'joe': 85, 'peter': 88, 'jack': 90, 'kris': 85} >>> del a['kris'] >>> print (a) {'joe': 85, 'peter': 88, 'jack': 90} >>> a = str(a) >>> print (a) {'joe': 85, 'peter': 88, 'jack': 90} >>> print (a[0:5]) {'joe
>>> 'peter' in a True >>> 'michel' not in a True
>>> a = {'joe' : 85 , 'peter' : 88 , 'jack' : 90} >>> b = a.get('peter',0) >>> print (b) 88 #get() method will return the value of the given key if that key is present, else it will return the second argument. >>> c = a.get('kris',0) >>> print (c) 0 >>> b = a.keys() >>> print (b) dict_keys(['joe', 'peter', 'jack']) #Note: keys() method return object with type “dict_keys”, to convert this to a list , you can use list() >>> b = a.values() >>> print(b) dict_values([85, 88, 90]) >>> print (list(b)) [85, 88, 90]
>>> marks = {'peter': [80,85,90], 'jose' : [85,90,95]} >>> print(marks['jose']) [85, 90, 95] >>> print (marks['jose'][0]) 85 >>> marks['jose'][0] = 86 >>> print (marks) {'jose': [86, 90, 95], 'peter': [80, 85, 90]} #Note: in this method ,If we consider ‘jose’ and ‘peter’ as rows in the two dimensional dictionary, columns can be represented only using numbers from 0 to ‘n’ (index of list)
>>> marks2= {'jose' : {'maths': 85 , 'english': 90, 'science' : 95} , 'peter' : {'marks': 80 , 'english':85 , 'science': 90}} >>> print (marks2['jose']['science']) 95 >>> marks2['jose']['science'] = 96 >>> print (marks2) {'jose': {'science': 96, 'maths': 85, 'english': 90}, 'peter': {'science': 90, 'marks': 80, 'english': 85}}
>>> from collections import defaultdict >>> marks3 = defaultdict(dict) >>> marks3['jose']['maths'] = 85 >>> marks3['jose']['science'] = 95 >>> marks3['peter']['maths'] = 80 >>> marks3['peter']['english'] = 85 >>> print(marks3) defaultdict(<class 'dict'>, {'jose': {'science': 95, 'maths': 85}, 'peter': {'maths': 80, 'english': 85}}) >>> print(marks3['jose']['science']) 95
Create a database in the following format
Values = Router1 1.1.1.1 zframez zframez Keys = (name) (IP) (username) (pwd)
1. Write a python program to print the value of a given key
2. Write a python program to check whether the given key is present, if present print the value , else add a new key and value
Create a database in the following format
Interface IP status 1 Ethernet0 1.1.1.1 up 2 Ethernet1 2.2.2.2 down 3 Serial0 3.3.3.3 up 4 Serial1 4.4.4.4 up
3. Write a python program to find status of a given interface
4. Write a python program to find interface and IP of all interfaces which are up
5. Write a python program to count how many ethernet interfaces are there
6. Write a python program to add a new entry to above database
Next chapter: Python training : Functions, Lambda functions, Local and Global variables
Previous chapter: Python training : Lists, Slicing examples, List methods and Tuples