A5 - Lists and Strings

Reference for this assignment

Python Manual - Pages 8-10

Learning Goals

• Make use of string/list indexing to extract individual characters or items (example - my_list[3])
• Extract a range of characters/items using colon notation (example - email_address[0:10])
• Use string and list methods (examples - my_list.append(7), my_string.lower())
• Use the len function

Suggested Task

Part A

Begin with a Python program containing the following list of strings:

strings_in = ["ab(def)ghi", "Hello(there)", "12+13(=)25"]
strings_out = []

for string in strings_in:
    pass # remove this line and replace with your code

With each string in the list, the program should:

1. Output the length of the string
2. Output the index of the ( and the index of the ) character
3. Extract the text inside the parentheses, and add that text as a new item in the strings_out list.

At the end, you should print the strings_out list.

The output should look something like this (the formatting doesn't need to match exactly):

string length is 10 | index of '(' is 2 | index of ')' is 6
string length is 12 | index of '(' is 5 | index of ')' is 11
string length is 10 | index of '(' is 5 | index of ')' is 7
['def', 'there', '=']

Part B

Write your own program that will somehow usefully manipulate a list of strings, and store the results in a new list of strings. For example, here is a program what will take a list of email addresses, extract the part that comes before the @ sign, and make all letters lowercase:

emails = ["dcstewart@scdsb.on.ca", "ME@example.com", "PineAPPle@tropical-fruit.com"]
result = []

for email in emails:
    at_index = email.find("@")
    first_part = email[0:at_index]
    first_part_lowercase = first_part.lower()
    result.append(first_part_lowercase)

print(result)
# Output is ['dcstewart', 'me', 'pineapple']