Category: Dictionaries

Dictionary Exercise 1 Python program to create a new dictionary by extracting the keys from a given dictionary. d1 ={“one”:11,”two”:22,”three”:33,”four”:44,”five”:55} keys =[‘two’,’five’] d2={}for k in keys: d2[k]=d1[k]print(d2) It will produce the following output − {‘two’: 22, ‘five’: 55}Dictionary Exercise 2Python program to convert a dictionary to list of (k,v) tuples.d1 = {“one”:11, “two”:22, “three”:33, “four”:44, “five”:55}L1 = list(d1.items())print…

A Python dictionary is an object of the built-in dict class, which defines the following methods − Dictionary Methods Sr.No. Method and Description 1 dict.clear()Removes all elements of dictionary dict. 2 dict.copy()Returns a shallow copy of dictionary dict. 3 dict.fromkeys()Create a new dictionary with keys from seq and values set to value. 4 dict.get(key, default=None)For key key, returns value…

Nested Dictionaries Nested dictionaries in Python refer to dictionaries that are stored as values within another dictionary. In other words, a dictionary can contain other dictionaries as its values, forming a hierarchical or nested structure. Nested dictionaries can be modified, updated, or extended in the same way as regular dictionaries. You can add, remove, or update…

Copy Dictionaries Copying dictionaries in Python refers to creating a new dictionary that contains the same key-value pairs as the original dictionary. We can copy dictionaries using various ways, depending on the requirements and the nature of the dictionary’s values (whether they are mutable or immutable, nested or not). Shallow Copy When you perform a…

Loop Through Dictionaries Looping through dictionaries in Python refers to iterating over key-value pairs within the dictionary and performing operations on each pair. This allows you to access both keys and their corresponding values. There are several ways/methods for looping through dictionaries − Loop Through Dictionary Using a For Loop A for loop in Python…

The items(), keys(), and values() methods of dict class return view objects. These views are refreshed dynamically whenever any change occurs in the contents of their source dictionary object. The items() Method The items() method returns a dict_items view object. It contains a list of tuples, each tuple made up of respective key, value pairs. Syntax Following is the syntax of the items() method − Obj…

Remove Dictionary Items Removing dictionary items in Python refers to deleting key-value pairs from an existing dictionary. Dictionaries are mutable data structures that hold pairs of keys and their associated values. Each key acts as a unique identifier, mapping to a specific value within the dictionary. Removing items from a dictionary allows you to eliminate…

Add Dictionary Items Adding dictionary items in Python refers to inserting new key-value pairs into an existing dictionary. Dictionaries are mutable data structures that store collections of key-value pairs, where each key is associated with a corresponding value. Adding items to a dictionary allows you to dynamically update and expand its contents as needed during…

Change Dictionary Items Changing dictionary items in Python refers to modifying the values associated with specific keys within a dictionary. This can involve updating the value of an existing key, adding a new key-value pair, or removing a key-value pair from the dictionary. Dictionaries are mutable, meaning their contents can be modified after they are…

Access Dictionary Items Accessing dictionary items in Python involves retrieving the values associated with specific keys within a dictionary data structure. Dictionaries are composed of key-value pairs, where each key is unique and maps to a corresponding value. Accessing dictionary items allows you to retrieve these values by providing the respective keys. There are various ways to…