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Accessing the values of dictionary

In order to access the dictionary's values you will need the key. Consider a dictionary of networking ports: In order to access the dictionary's values you will need the key. Consider a dictionary of networking ports:

Port = {80: “HTTP”, 23 : “Telnet”, 443 : “HTTPS”}

Let's learn by example:

>>> port = {80: "HTTP", 23 : "Telnet", 443 : "HTTPS"}>>> port[80]'HTTP'>>> port[443]'HTTPS'

In order to access the dictionary's value, use the square brackets along with the key. What happens if the key is not in the dictionary?

>>> port[21]Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> port[21]KeyError: 21>>>

If the key is not found, then the interpreter shows the preceding error.