How-to articles, tricks, and solutions about DICTIONARY

To add a new item (key-value pair) to a dictionary in Python, you can use the square brackets [] or the update() method.

To check if a given key already exists in a dictionary, you can use the in keyword.

Here is an example of how you can convert a JSON string to a HashMap in Java:

You can use the json module in Python to convert a string representation of a dictionary to a dictionary.

Here is an example of how to convert a list of dictionaries to a pandas DataFrame:

In Python, you can convert a dictionary to a list of its keys or values using the keys() and values() methods, respectively.

To create a dictionary using comprehension in Python, you can use the following syntax:

To delete an element from a dictionary in Python, you can use the del statement.

To determine the type of an object in Python, you can use the type function.

You can use the in keyword to check if a value exists in a dictionary, and then use the items() method to return a list of key-value pairs.

You can use the built-in max() function in Python to get the key with the maximum value in a dictionary.

To add a new key-value pair to a dictionary in Python, you can use the update() method or simply assign a value to a new key using square brackets [].

You can use the values() method to get a list of values from a dictionary:

To initialize a static Map in Java, you can use the Map interface's of method, which was added in Java 9. The of method creates an immutable Map with a fixed set of key-value pairs.

You can use the zip function to create a dictionary from separate lists of keys and values like this:

You can use the del statement to remove a key-value pair from a dictionary in Python.

To sort the values of a Map by key in Java, you can use the TreeMap class, which is a Map implementation that maintains its entries in ascending key order.

You can use the entrySet() method of the Map interface to get a Set view of the mappings contained in the map, and then create a List from this set using the new

There are several ways to iterate over the entries in a Map in Java. Here are some options:

You can use the update() method of one dictionary to merge the key-value pairs from another dictionary into it.

You can use the items() method to print the key-value pairs of a dictionary in Python.

In Python, dictionaries are unordered collections of key-value pairs.

You can use the sorted() function and pass it the dictionary, along with the key parameter set to a lambda function that returns the value from the dictionary.

To sort a list of dictionaries by a value of the dictionary, you can use the sorted() function and specify the key parameter to be a lambda function that returns the value you want to sort by.

To create a dictionary (or map) in Java, you can use the Map interface and its implementing classes.