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How-to articles, tricks, and solutions about DICTIONARY

Add a new item to a dictionary in Python

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

python dictionary items

Check if a given key already exists in a dictionary

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

python dictionary

Convert a JSON String to a HashMap

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

json java dictionary

Convert a String representation of a Dictionary to a dictionary

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

string python dictionary

Convert list of dictionaries to a pandas DataFrame

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

python dictionary pandas dataframe

Converting Dictionary to List?

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

list python dictionary

Create a dictionary with comprehension

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

python dictionary list-comprehension dictionary-comprehension

Delete an element from a dictionary

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

python dictionary del

Determine the type of an object?

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

python dictionary types typeof

Get key by value in dictionary

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.

python dictionary