Python Program: Lookup

This program uses many of the things weve discussed in our lectures including: dictionaries, functions, exception handling, optional arguments, methods, looping, conditionals, etc.

The program should ask the user if theyd like to lookup up phone numbers or addresses. Once determined, the program should repeatedly ask the user for a persons name (first and last name) and look up and display the appropriate information. Error conditions should be handled appropriately. An example of the output follows:

 Lookup (1) phone numbers or (2) addresses: 2 Enter space-separated first and last name: Buck Rogers error: person not found. Enter space-separated first and last name: Drew Smith Street: 285 Andover Lane City: Pompano Beach State: FL Zip Code: 33060 Enter space-separated first and last name: Josh Kelly Street: 7416 Monroe Ave. City: Media State: PA Zip Code: 19063 Enter space-separated first and last name: 

Lookup (1) phone numbers or (2) addresses: 1 Enter space-separated first and last name: Drew Smith Phone: 412-555-2121 Enter space-separated first and last name: Josh Kelly Phone: 424-555-4053 Enter space-separated first and last name: 

Data file address.txt

The program should use the file address.txt as the data file. address.txt contains a list of names, addresses and phone numbers. address.txt has the following comma- separated format, where the first field is the first and last name, the second field is the street, third is the city, fourth is the state, fifth is the zip code, and the last field is the phone number.

Pradeep Acharya, 9510 Atlantic Street, Centreville, VA, 20120, 301-555-3276 John Brady, 137 Church Street, Westwood, NJ, 07675, 321-555-6932 James Chen, 87 Pierce Road, Windsor, CT, 06095, 256-555-3331 Josh Kelly, 7416 Monroe Ave., Media, PA, 19063, 424-555-4053 Brady Parker, 80 Franklin Dr., Waterbury, CT, 06705, 756-555-3828 Drew Smith, 285 Andover Lane, Pompano Beach, FL, 33060, 412-555-2121 Elizabeth Smith, 285 Andover Lane, Pompano Beach, FL, 33060, 412-555-2122

.

To download address.txt from within Blackboard, right-click on the file and select Save link as... Make sure to save the file to the same folder you plan to write your script in so it will be found when you use the open function to open it (otherwise, you will have to provide a full pathname for the file to the open function.)

Requirements:

• Name your script _lookup.py

• The program should have 3 functions:

  1. An input function to read the comma-separated addresses from file address.txt into a dictionary. The function should: a. Take no arguments. b. Use the first field (first and last name) as the dictionary key. The

     dictionary value should be the entire line. (I suggest you strip off the

     newline from each line right after you read it in.) c. When you open the file for reading, use a try...except to detect if the

     file open fails. If so, print an error end exit the program with an exit

     code of 1. d. return the dictionary as the return value of the function.

  2. A function to format and display the output. Use whatever arguments are appropriate but at least one of them should determine if the function should display just the phone number or the address information. Make this argument an optional argument with the default being to print just the phone number. The address output should be formatted neatly, similar to the following:

 Street: 285 Andover Lane City: Pompano Beach State: FL Zip Code: 33060 

3. Amain() function that:

a. Calls the input function to populate the address/phone dictionary.

b. Ask the user if they want to lookup phone numbers or addresses, and

do so in a loop until they select an appropriate option.

c. Repeatedly loop, asking for a valid first and last name, and calling the function to format and display the output.

If the name does not exist, an appropriate message should be displayed and the user prompted again.

d. The program should end when the user enters a blank or empty line.

Notes:

1. The program should work if the user enters names in uppercase, lowercase, or a mix of case. Since the names in the file address.txt are of mixed case, for comparisons, youll want to make use of the string method .lower() to convert both the input names and the dictionary keys to lowercase.

2. The dictionary should not be a module-level variable.

3. As always, follow proper coding techniques including proper documentation,

variable naming, etc.