When I test out the code on various data sets (dictionaries similar to the example) it works but not for the task answer

# 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(arg1):
    return1=0
    dictA=arg1
    for key in dictA:
        return1 +=1
        continue
    return(return1)

def num_courses(arg2):
    return2=0
    dictA=arg2
    for key in dictA:
        return2 += len(dictA[key])
        continue
    return(return2)

def courses(arg3):
    return3=[]
    dictA=arg3
    for key in dictA:
        return3.extend(dictA[key])
    return(return3)

def most_courses(arg4):
    return4=[]
    courseLen=0
    dictA=arg4
    for key in dictA:
        if len(dictA[key])>courseLen:
            return4=key
            courseLen=len(dictA[key])
        else:
            continue
    return(return4)

 def stats(arg5):
        retValue=[]
        for key,value in arg5.items():
            retValue.append([key,len(value)])

    return(retValue)