- \n
- Python dictionary extend vs append<\/li>\n
- Python dictionary extend list<\/li>\n
- Python extend dictionary class<\/li>\n
- Python dictionary extend function<\/li>\n
- Python extend dictionary with another<\/li>\n
- Python dictionary extend vs update <\/li>\n<\/ul>\n\n\t\t\t
\n\t\t
\n\t\t
\n\t\t
\n\t\t\n\t<\/div>\nPython dictionary extend<\/h2>\n
- \n
- In this program, we will see how to extend a dictionary in Python<\/strong>.<\/li>\n
- In Python, the dict.update()<\/strong> will help the user to extend a dictionary with the key-value pair from one dictionary to another.<\/li>\n<\/ul>\n
Example:<\/strong><\/p>\n
Let’s take an example and check how to extend a dictionary in Python<\/a>.<\/p>\n
my_dict1 = {\"james\": 18, \"potter\": 67}\n\nnew_dictionary = {\"George\": 12, \"Micheal\": 91}\nmy_dict1.update(new_dictionary)\nprint(my_dict1)<\/code><\/pre>\nIn the above example first, we initialize two dictionaries ‘my_dict1’<\/strong> and ‘new_dictionary’ <\/strong>which contain elements in the form of key-value pair.<\/p>\n
Now we have to use dict.update()<\/strong> method to extend the dictionary into another one.<\/p>\n
Here is the execution of the following given code<\/p>\n
{'james': 18, 'potter': 67, 'George': 12, 'Micheal': 91}<\/code><\/pre>\n\n![\"python](\"https:\/\/pythonguides.com\/wp-content\/uploads\/2021\/09\/python-dict-expansion.jpg\" "\\"python")
Python dictionary extend<\/figcaption><\/figure>\n<\/div>\n How to extend a dictionary in Python<\/h2>\n
By using the **<\/strong> operator we can perform this particular task and this method adds the specified dictionary elements to the end of the current dictionary.<\/p>\n
Source Code:<\/strong><\/p>\n
my_dict = {'m': 51, 'q': 82}\nz = {'k': 10, 'u': 14}\n\nd = {**my_dict, **z}\nprint(d)<\/code><\/pre>\nOutput:<\/strong><\/p>\n
{'m': 51, 'q': 82, 'k': 10, 'u': 14}<\/code><\/pre>\n\n![\"Python](\"https:\/\/pythonguides.com\/wp-content\/uploads\/2021\/09\/Python-dictionary-extend.jpg\" "\\"Python")
Python dictionary extend<\/figcaption><\/figure>\n<\/div>\n This is how to extend a dictionary in Python<\/strong>.<\/p>\n
Python dictionary extend vs append<\/h2>\n
- \n
- In Python dictionary, the append()<\/strong> function is used to add elements to the keys in the dictionary. In the dictionary extend() means to concatenate the first dictionary with another dictionary.<\/li>\n
- In Python dictionary, the append() function is used to add elements to the keys in the dictionary. In the dictionary extend() means to concatenate the first dictionary with another dictionary.<\/li>\n
- In this program, we will learn about the update()<\/strong> function and check how to add elements to a given dictionary. In a Python dictionary, the update() function is used to update the dictionary with the elements in the form of a Key-value pair from another dictionary.<\/li>\n
- In Python dictionary, append can be used by list as a list, we can also use the “+”<\/strong> operator to append the lists of each key within a dictionary.<\/li>\n<\/ul>\n
Example:<\/strong><\/p>\n
Let’s an example and check the combination of the update()<\/strong> and append()<\/strong> functions in a Python dictionary<\/p>\n
student_name = {'Micheal':178, 'George':923}\nadd_new = {'Potter':236}\n\nstudent_name.update(add_new)\nprint(\"Update elements\",student_name)\n\nnew_country = {'Germany': 'France'}\nnew_country['Germany'] = [8]\nnew_country['Germany'].append('France')\nprint(\"Append elements\",new_country)<\/code><\/pre>\nAfter writing the above code, you will see first we initialize a dictionary that stores key-value pair elements. Here the update()<\/strong> function is used to add the element in the dictionary and call the print statement to display the output.<\/p>\n
After that create another dictionary and use the append function to insert the elements in the dictionary.<\/p>\n
Here is the execution of the following given code<\/p>\n
Update elements {'Micheal': 178, 'George': 923, 'Potter': 236}\r\nAppend elements {'Germany': [8, 'France']}<\/code><\/pre>\n\n![\"python](\"https:\/\/pythonguides.com\/wp-content\/uploads\/2021\/09\/python-expand-dict.jpg\" "\\"python")
Python dictionary extend vs append<\/figcaption><\/figure>\n<\/div>\n Python dictionary extend list<\/h2>\n
- \n
- Here we can see how to update the value list in a Python dictionary.<\/li>\n
- By using the list comprehension method we can update the value list to extract a particular key and then iterate over its value in this method.<\/li>\n<\/ul>\n
Source Code:<\/strong><\/p>\n
stud_dictionary = {'student_id' :678, 'student_val' : [9,2,1], 'age' : 19}\n\nstud_dictionary['student_val'] = [y * 4 for y in stud_dictionary['student_val']]\nprint(\"Updated dictionary:\",stud_dictionary)<\/code><\/pre>\nIn the above code, once you will print “stud_dictionary”<\/strong> then the result will display as a “student_val”:[36,8,4].<\/strong> In this program, the “*” <\/strong>operator is used to update the values from a list. You can check the below screenshot for updating the value list.<\/p>\n
Output:<\/strong><\/p>\n
Updated dictionary: {'student_id': 678, 'student_val': [36, 8, 4], 'age': 19}<\/code><\/pre>\n\n![\"extend](\"https:\/\/pythonguides.com\/wp-content\/uploads\/2021\/09\/extend-python-dictionary.jpg\" "\\"extend")
Python dictionary extend the list<\/figcaption><\/figure>\n<\/div>\n Python extend dictionary class<\/h2>\n
- \n
- In this program, we will see how to extend a Python dictionary class whose instances will keep the data contained by their element in the form of a key-value pair.<\/li>\n
- In this example, we can apply the subclasses like dict and use built-in keywords like ‘self’ and ‘super’.<\/strong><\/li>\n<\/ul>\n
Example:<\/strong><\/p>\n
class my_new_dict(dict):\n def __init__(self, *b, **a):\n super(my_new_dict,self).__init__(*b, **a)\n self.itemlist = super(my_new_dict,self).keys()\n def __setitem__(self, new_k, new_va):\n \n set(self.itemlist).add(new_k)\n super(my_new_dict,self).__setitem__(new_k, new_va)\n def __iter__(self):\n return iter(self.itemlist)\n\n \nnew_val = my_new_dict(m=4,z=7)\nprint(\"original dictionary:\",new_val)\nnew_val['u']=15\nnew_val['w']=19\nprint (\"Updated dictionary:\",new_val)<\/code><\/pre>\nNote:<\/strong> In this example dict.keys() <\/strong>method does not return a list so we apply the ‘self. item list’ <\/strong>method.<\/p>\n
In the above code, once you print “new_val” then the output will display as a ‘{‘m’:4,’z’:7,’u’:8}’. In this program, we use the function ‘_init_’ in which we have assigned ‘self’ and ‘*args’<\/strong> as an argument.<\/p>\n
Here is the implementation of the following code:<\/p>\n
original dictionary: {'m': 4, 'z': 7}\r\nUpdated dictionary: {'m': 4, 'z': 7, 'u': 15, 'w': 19}<\/code><\/pre>\n\n![\"extend](\"https:\/\/pythonguides.com\/wp-content\/uploads\/2021\/09\/extend-a-dictionary-python.jpg\" "\\"extend")
Python extend dictionary class<\/figcaption><\/figure>\n<\/div>\n Python dictionary extend function<\/h2>\n
Note:<\/strong> In the Python dictionary, there is no built-in extend() function which we can apply in a dictionary. So in this case we can apply the update ()<\/strong> function and it will help the user to update the dictionary with the elements in the form of a key-value pair from another dictionary.<\/p>\n
Python extend dictionary with another<\/h2>\n
- \n
- Let us see how to add a dictionary with another dictionary in Python<\/strong>. <\/li>\n
- By using the ** <\/strong>operator we can solve this task and this method inserts the specified dictionary elements in the form of a key-value pair to the end of the current dictionary.<\/li>\n<\/ul>\n
Example:<\/strong><\/p>\n
my_new_org_dict = {'John': 782, 'Micheal': 173}\nupdate_dict = {'George': 192, 'oliva': 967}\n\nnew_val = {**my_new_org_dict, **update_dict}\nprint(new_val)<\/code><\/pre>\nOutput:<\/strong> In the above code first, we will initialize a dictionary called ‘my_new_org_dict’ <\/strong>that stores elements and then use another dictionary ‘update_dict’.<\/strong><\/p>\n
Now in this program, we use the operator ‘**’ for appending elements. Here we can see that the dictionary is added to another dictionary.<\/p>\n
{'John': 782, 'Micheal': 173, 'George': 192, 'oliva': 967}<\/code><\/pre>\nYou can refer to the below screenshot:<\/p>\n
\n![\"how](\"https:\/\/pythonguides.com\/wp-content\/uploads\/2021\/09\/how-to-extend-a-dictionary-in-python.jpg\" "\\"how")
Python extend dictionary with another<\/figcaption><\/figure>\n<\/div>\n Python dictionary extend vs update<\/h2>\n
- \n
- Here we will discuss the difference between the extend and update method in Python.<\/li>\n
- In Python, there is no extend() function in the dictionary but we can apply this method in lists and tuples. In Python, the update() <\/strong>function is used to modify the dictionary and by using this method we can concatenate the old dictionary to a new dictionary.<\/li>\n<\/ul>\n
Example:<\/strong><\/p>\n
my_new_dict = {'Mongodb':800,'Sql':892,'C++':956}\n\nprint(\"NewLanguages\",my_new_dict)\nmy_new_dict.update({'java':300,'Pascal':890})\nprint(\"updated language\",my_new_dict)<\/code><\/pre>\nHere is the Output of the following given code:<\/p>\n
NewLanguages {'Mongodb': 800, 'Sql': 892, 'C++': 956}\r\nupdated language {'Mongodb': 800, 'Sql': 892, 'C++': 956, 'java': 300, 'Pascal': 890}<\/code><\/pre>\n\n![\"python](\"https:\/\/pythonguides.com\/wp-content\/uploads\/2021\/09\/python-extend-dictionary-with-another.jpg\" "\\"python")
Python dictionary extend vs update<\/figcaption><\/figure>\n<\/div>\n In this Python tutorial, we will discuss the Python dictionary extend. <\/strong>Here we will also cover the below examples: <\/p>\n
- \n
- Python dictionary extend vs append<\/li>\n
- Python dictionary extend list<\/li>\n
- Python extend dictionary class<\/li>\n
- Python dictionary extend function<\/li>\n
- Python extend dictionary with another<\/li>\n
- Python dictionary extend vs update <\/li>\n<\/ul>\n
Related Posts:<\/strong><\/p>\n
- \n
- Python dictionary values to list<\/a><\/li>\n
- Python dictionary contains<\/a><\/li>\n
- Iterate through dictionary Python<\/a><\/li>\n
- Python dictionary comprehension<\/a><\/li>\n
- How to extend NumPy<\/a><\/li>\n<\/ul>\n\n
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- Python dictionary contains<\/a><\/li>\n
- Python dictionary values to list<\/a><\/li>\n
- By using the ** <\/strong>operator we can solve this task and this method inserts the specified dictionary elements in the form of a key-value pair to the end of the current dictionary.<\/li>\n<\/ul>\n
- Let us see how to add a dictionary with another dictionary in Python<\/strong>. <\/li>\n
- In Python, the dict.update()<\/strong> will help the user to extend a dictionary with the key-value pair from one dictionary to another.<\/li>\n<\/ul>\n
- In this program, we will see how to extend a dictionary in Python<\/strong>.<\/li>\n