Create a webpage for "Dictionaries"

[ravin-d-27]

Create a Web Page to explain Dictionary concepts clear.

A key-value pair is a combination of a unique identifier (key) and an associated value. The key is used to access the corresponding value.

Unordered Collection: Dictionaries in Python are unordered, meaning there's no guarantee that elements will be in a specific order. This is different from lists or tuples where elements are ordered by index.

Mutable: Dictionaries are mutable, which means their content can be changed after creation. You can add, modify, or delete key-value pairs.

Hashing: Dictionaries use a hashing function to map keys to their corresponding values. This allows for efficient retrieval of values based on their keys.

Keys must be Immutable: Keys in a dictionary must be of an immutable data type (e.g., strings, numbers, tuples). This is because the key needs to be hashable.

Unique Keys: Each key in a dictionary must be unique. If you try to add a key that already exists, the existing value will be overwritten.

Accessing Values by Key: You can retrieve the value associated with a key by using the square bracket notation (my_dict[key]). If the key is not present, it will raise a KeyError.

Dictionary Methods: Python provides various methods for dictionaries, including get(), items(), keys(), values(), pop(), popitem(), update(), etc. These methods offer a range of operations for working with dictionaries.

in Operator: The in operator allows you to check if a specific key exists in the dictionary. For example, key in my_dict will return True if key is present.

Length of a Dictionary: You can find the number of key-value pairs in a dictionary using the len() function.

Dictionary Comprehensions: Like lists, dictionaries can be created using comprehensions, which provide a concise way to construct dictionaries.

Nested Dictionaries: Dictionaries can contain other dictionaries as values. This allows for more complex data structures.

Iterating Over Dictionaries: You can loop through the keys, values, or items (key-value pairs) of a dictionary using loops or comprehensions.

Default Values: The get() method allows you to provide a default value if the key is not found in the dictionary. This prevents a KeyError.

Copying Dictionaries: Dictionaries can be copied using methods like copy(). Be careful when copying as it creates a new reference, not a new copy of the dictionary.

Dictionary View Objects: dict.keys(), dict.values(), and dict.items() return view objects that provide a dynamic view on the dictionary's keys, values, and key-value pairs respectively.

Dictionary Merging: The update() method can be used to merge two dictionaries. If there are overlapping keys, the values from the second dictionary overwrite the values from the first.

[harshkushwaha2001]

hi @ravin-d-27 ,,I would like work on it, I have knowledge of Python as well as HTML,CSS and JavaScript . Please assign me.

[ravin-d-27]

Hi @harshkushwaha2001 , this issue has already been assigned. Please checkout other issues.

[ravin-d-27]

Closing this issue as the PR is merged