1. sort_ignore_case.py
2. years_dictionary.py

# Example using sort with a key
# Sara Sprenkle

words = ["Washington", "and", "Lee", "computer", "science"]

words.sort()

print("Words in Python str-standard sorted order:")

for word in words:
    print(word)

print()

print("Words in sorted order, ignoring upper and lower case:")

# says the key being used to do the sorting: using the str class's
# lower() method.
words.sort(key=str.lower)

for word in words:
    print(word)

# Given a file of the form <firstname> <year>
# creates a mapping between the class year and the number
# of people in that class.
# by CSCI 111

FILENAME="data/roster.dat"

# open the file for reading
yearsFile = open(FILENAME, "r")

# create dictionary
classYearToNumStudents = {}

# read each line of the file
for line in yearsFile:
    # split the line on space
    studentInfoList = line.split()
    
    # extract the classyear from the split line
    classYear = studentInfoList[1]
    
    if classYear in classYearToNumStudents: 
        # update the accumulator for this class year
        # 1) get the value of the accumulator for the class year
        # 2) update that accumulator's value
        #count = classYearToNumStudents[classYear]
        #classYearToNumStudents[classYear] = count + 1
        
        # above two lines are equivalent to this:
        classYearToNumStudents[classYear] += 1
    else:
        classYearToNumStudents[classYear] = 1
    
yearsFile.close()

for classYear in sorted(classYearToNumStudents):
    print(classYear, classYearToNumStudents[classYear])