# Python - Student Becomes the Teacher 9/9

#1

No clue what is wrong, the error message says:
Traceback (most recent call last):
File "python", line 67, in
TypeError: cannot concatenate 'str' and 'float' objects

``````lloyd = {
"name": "Lloyd",
"homework": [90.0, 97.0, 75.0, 92.0],
"quizzes": [88.0, 40.0, 94.0],
"tests": [75.0, 90.0]
}

alice = {
"name": "Alice",
"homework": [100.0, 92.0, 98.0, 100.0],
"quizzes": [82.0, 83.0, 91.0],
"tests": [89.0, 97.0]
}

tyler = {
"name": "Tyler",
"homework": [0.0, 87.0, 75.0, 22.0],
"quizzes": [0.0, 75.0, 78.0],
"tests": [100.0, 100.0]
}

def average(numbers):
total = sum(numbers)
total = float(total) / float(len(numbers))

def get_average(student):
homework = average(student["homework"])* 0.1
quizzes = average(student["quizzes"])* 0.3
tests = average(student["tests"])* 0.6

avrg = homework + quizzes + tests
return avrg

if score>= 90:
return 'A'
elif score>= 80:
return 'B'
elif score>= 70:
return 'C'
elif score >= 60:
return 'D'
else:
return 'F'

print
print

students = [lloyd, alice, tyler]

def get_class_average(students):
results=[]
for student in students:
results.append(get_average(student))
return average(results)

print
print
print "Class number average:  " + get_class_average(students)
print "Class letter average:  " + get_letter_grade(get_class_average(students))``````

#2

Take a look at this line:

``print "Class number average:  " + get_class_average(students)``

`"Class number average: "` is a string, `get_class_average(students)` is a float. You can't add a float to the string. You need to convert the numerical value to string using `str` function:

``print "Class number average:  " + str(get_class_average(students))``

Or print both values without concatenation:

``print "Class number average:  ", get_class_average(students)``

#3

#4

You're very welcome

#5

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.