Getting the number of values in dictionary challenge

# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.
def num_teachers(dict1):
    num_teachers = 0
    for key in dict1.keys():
        num_teachers += 1
    return num_teachers

def num_courses(dict1):
    num_values = 0
    for values in dict1.values():
        for item in values:
            num_values += 1
    return num_values

def courses(dict1):
    num_courses = []
    for values in dict1.values():
        for item in values:
            num_courses.append(item)
    return num_courses

def most_courses(dict1):
    value1 = []
    for key, value in dict1.items():
        value1.append(len(value))
        if len(value) == max(value1):
               return key