E-mail Harvester Assignment
From WLCS
Objectives:
- Be able to define functions with parameters
- Be able to call functions with parameters
- Be able to use while loops
- Be able to traverse a string
- Be able to manipulate strings
References:
Directions:
- Write a function named findAtSymbol(s) that takes a single parameter, s, which is a string.
- The function should traverse the string with a loop and use an if statement check if any character s[x] matches the "@" symbol. Your function should then return the index of the "@" symbol
- Write a more generalized find() function named find(s, ch, index)
- This time, the function should walk through s with a loop and look to see if any s[x] matches ch
- The loop counter should start the search at index
- return the location of the character ch in string s when there is a match
- Create another find() function that does the same thing as the above find function, but instead of searching forwards, it searches backwards.
- Name the function findBackwards(s, ch, index)
- findBackwards() should also return an index
- Create a new function named harvestEmail(s) where the user's sentence is passed in as s. Inside harvestEmail(s), use the functions that you defined above to isolate the e-mail address
- First, find the @-symbol using findAtSymbol() and storing the result in a variable.
- Find the space before the @-symbol using findBackwards() with the index of the AT-symbol. Store its result in a variable.
- Lastly, find the space after the @-symbol by using the find() function and storing the result in a variable.
- You should then return the slice of the string that contains the e-mail address .
Advanced:
- After you have tested harvestE-mail(s), create a new function named:
- harvestAllEmails(lines) which prints out all the e-mail addresses from a given paragraph
Testing:
# You should test harvestEmail() with the following doctest
def harvestEmail(s):
"""
>>> harvestEmail("here is an email@address.com to test")
'email@address.com'
>>> harvestEmail("test this@this.com out")
'this@this.com'
>>> harvestEmail("is your e-mail a@a.com even in this sentence?")
'a@a.com'
"""
if __name__ == '__main__':
import doctest
doctest.testmod()
Rubric
Criteria | Pts |
---|---|
'find' works perfectly | 2 |
'findAtSymbol' works perfectly | 2 |
'findBackwards' works perfectly | 2 |
'harvestEmail' return correct string | 2 |
Handles emails at the start or end of the string (e.g. no spaces before or after). | 2 |
Bonus: Good variable names | +2 |
Bonus: Simple, clear code | +2 |
Maximum points | 10 + 4 |