# Write a function call most_common that
# accepts the file name to be read.
# The file contains courses students will take spring 2019.
# The function then returns the most common course

def most_common(filename):









print('most_common', most_common('course-s19.csv'))


# Create a second (modified) version of the
# most_common function that returns a dictionary,
# where the key is course and the value is
# the number of students who will take that course

def most_common2(filename):








print('most_common2', most_common2('course-s19.csv'))


# Create another (modified) version of the
# most_common2 function that, print a dictionary (instead of return)
# in the following format:
#    5 students will take CS1
#    2 students will take CS2
#    ...
# (don't worry about the order, just focus on using key and value
# and format the output)

def most_common3(filename):









# print('most_common3 ---', most_common3('course-s19.csv'))   # since most_common3 doesn't return anything (i.e., None), print will show None
print('most_common3 ---')
most_common3('course-s19.csv')