Dictionary functions

In this section, we will explore the built-in functions available in Python, which can be applied to dictionary. You may have seen most of the functions in the previous chapters of  list and tuple. In this section, you will see how to apply those functions to a dictionary.

len()

In order to find the number of items that are present in a dictionary, you can use the len() function. See the following example:

>>> port = {80: "http", 443: "https", 23:"telnet"}
>>> len(port)
3
>>>

str()

Consider a situation where you want to convert a dictionary into a string; here you can use the str() function. The syntax of the method is as follows:

str(dict) 

Consider the following example:

>>> port = {80: "http", 443: "https", 23:"telnet"}
>>> port
{80: 'http', 443: 'https', 23: 'telnet'}
>>> str(port)
"{80: 'http', 443: 'https', 23: 'telnet'}"
>>>

You can easily see the double quotes around the dictionary. Let's get the max key from...