Step 1

• Create a new Python file in PyCharm.
• Right-click the project you created previously, and select New > Python File

Step 2

• Create an empty dictionary.

servicePorts = {}

Step 3

• Create an infinite while loop.

while True:

Step 4

• Create a variable that asks for a service name.

    service = input("Please enter a service's name or type '0' to stop: ")

Step 5

• Add an if condition in the while loop to break the loop if the input from the user is 0.

    if service == "0":
        break

Step 6

• In the while loop, ask for a port number and assign it to the port variable.

    port = input("Please enter a port number or type '0' to stop: ")

Step 7

• Add another if condition in the while loop to break the loop if the input from the user is 0.

    if port == "0":
        break

Step 8

• Insert the data from the service and port variables as key-value pairs, in the empty dictionary created during step 1.

    servicePorts[service] = port

Step 9

• When the user decides to quit by pressing 0, print the entire dictionary.

print(servicePorts)

Step 10

• Right click on the filename to open the drop down list and click on Run “Filename.”

Step 11

• Input a service name (DNS) with its proper port number (53) and then end the program (0) which should give you these final results.

Final Code

"""Lab Objective: Understand how to work with user-defined dictionaries to control the program flow."""

servicePorts = {}

while True:
    service = input("Please enter a service's name or type '0' to stop: ")
    if service == "0":
        break
    port = input("Please enter a port number or type '0' to stop: ")
    if port == "0":
        break
    servicePorts[service] = port

print(servicePorts)

print(servicePorts["FTP"])

# prevents program from closing upon execution
input("\nPress 'Enter' to exit the program")