FirstToLast.py

# Write a function called first_to_last. first_to_last should
# take as input a string representing a filename. Inside the
# file will be some text on each line; some lines will contain
# integers, while others will contain strings of other
# characters.
#
# first_to_last should return a tuple containing the first and
# last strings in the file alphabetically. It should ignore any
# lines that contain integers.
#
# For example, in the dropdown in the top left you'll find a
# file named FirstLastInput.txt. Ignoring numerals, the first
# string alphabetically is appsp, and the last string
# alphabetically is zzffs. So, first_to_last("FirstLastInput.txt")
# would return the tuple ("appsp", "zzffs").
#
# You may assume that every line in the file contains either
# all numerals or all lower-case letters; there will be no lines
# with both numerals and letters, nor any capital letters.


# Write your function here!

def first_to_last(filename):
    with open(filename, "r") as first_file:
        line = first_file.read()  # read file use .read
        line_list = []  # create empty lists
        newline_list = []
        line = line.strip("\n")  # strip the trailing new line
        line = line.split()  # convert to a list
        line.sort()  # sort list
        result = [i for i in line if not i.isdigit()]  # extract the letters
        new_tuple_list = (result[0], result[-1])

        return (new_tuple_list)


# Below are some lines of code that will test your function.
# You can change the value of the variable(s) to test your
# function with different inputs.
#
# If your function works correctly, this will originally
# print: ("appsp", "zzffs")
print(first_to_last("FirstLastInput.txt"))