Tag: Keys
C++ : Map Tutorial Part 3: Using User defined class objects as keys in std::map
In this article we will discuss how to use User defined classes as key in std::map. By default std::map uses “operator <” as sorting criteria for keys. For default data types like int and std::string etc, operator < is available by default but for User defined classes operator < is not available by default. Advertisements …
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Java: How to get all keys by a value in HashMap ? | Search by Value in Map
In this article we will discuss how to search into a Map by value and fetch associated keys to the given value. Suppose we have a map of string and integers i.e. Advertisements HashMap<String, Integer> mapOfWords = new HashMap<String, Integer>() { { put(“John”, 25); put(“at”, 2); put(“from”, 10); put(“is”, 5); put(“the”, 2); put(“hello”, 1); put(“break”, …
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Python : How to Remove multiple keys from Dictionary while Iterating ?
In this article we will discuss how to remove multiple key / value pairs from dictionary while iterating. Suppose we have a dictionary of string and int i.e. Advertisements # Dictionary of strings wordFreqDic = { “Hello”: 51, “at” : 23 , “test” : 33, “here” : 63, “start” : 13 } Now we want …
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python : How to create a list of all the keys in the Dictionary ?
In this article we will discuss how to create a list of all keys in a dictionary. Suppose we have a dictionary of string and integers i.e. Advertisements # Dictionary of string and int wordFreqDic = { “Hello”: 56, “at” : 23 , “test” : 43, “this” : 78, “here” : 18, “city” : 2, …
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Python : How to find keys by value in dictionary ?
In this article we will discuss how to find all keys associated with a given single value or multiple values. Suppose we have a dictionary of words and thier frequency i.e. Advertisements # Dictionary of strings and int dictOfWords = { “hello”: 56, “at” : 23 , “test” : 43, “this” : 97, “here” : …
Python : Filter a dictionary by conditions on keys or values
In this article we will discuss different ways to filter contents from a dictionary by conditions on keys or value or on both. Suppose we have a dictionary in which int type element is key and string type elements are value i.e. Advertisements dictOfNames = { 7 : ‘sam’, 8: ‘john’, 9: ‘mathew’, 10: ‘riti’, …
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Python : How to get all keys with maximum value in a Dictionary
In this article we will discuss ways to find the maximum value in dictionary and also the all keys with the maximum value. Find a key with maximum value in Dictionary Suppose we have a dictionary of string and int i.e. Advertisements # Create a dictionary of string and int sampleDict = { ‘Ritika’: 5, …
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Python: Print all keys of a dictionary
In this article, we will discuss different ways to print all keys of a dictionary. Then we will also cover the scenario, where we need to print all the keys of nested dictionary i.e. dictionary of dictionaries. Print all keys of a python dictionary using for loop In Python, the dictionary class provides a function …
Python: Loop / Iterate over all keys of Dictionary
In this article, we will discuss different ways to iterate over all keys of a python dictionary. Table of Contents Loop over all keys of dictionary using for loop. Loop over all keys of dictionary using keys(). Loop over all keys of dictionary using items(). Loop over all keys of dictionary using for loop A …
Convert Dictionary keys to a List in Python
In this article, we will discuss different ways to convert all keys of a python dictionary to a list. Table of Contents Convert all keys of dictionary to list using list() Convert all keys of dictionary to list using List Comprehension Convert specific keys of dictionary to list Convert all keys of dictionary to list …