Putting it together

Combine all parts into a working app.

Putting it together: solve with a function

In the final lesson you will combine everything into a hesapla function. This function takes a grades list and returns its average:

def hesapla(lst):
    return sum(lst) / len(lst)

print("final:", hesapla(grades))
# final: 87.0

The starting code includes all previous solutions. You will define and call the hesapla function. This makes the code modular — the function can be reused with different grade lists.

The project is complete!

Exercise Define and call the hesapla function

Define def hesapla(lst): with return sum(lst) / len(lst) in the body. Then write print("final:", hesapla(grades)).

Show example solution

grades = [85, 90, 78]
print(grades)
grades.append(95)
print("eklendi:", len(grades))
average = sum(grades) / len(grades)
print("ortalama:", average)
empty = []
try:
    result = sum(empty) / len(empty)
except ZeroDivisionError:
    print("boş liste")
else:
    print(result)
def hesapla(lst):
    return sum(lst) / len(lst)
print("final:", hesapla(grades))

Project complete

Congratulations! You completed the five-lesson beginner final. You combined:

List for storing data
append for dynamic insertion
sum / len for computing the average
try/except for error handling
function for modular code

These five layers form the skeleton of a real app. In the next level OOP, decorators and more advanced topics will follow.

Test yourself

Match the project assembly

def hesapla

Function definition
return sum / len

Average
hesapla(grades)

Call
print("final:")

Output

Complete the return statement

def hesapla(lst):
    ____

Show answer

def hesapla(lst):
    return sum(lst) / len(lst)

What does hesapla(grades) return? (grades = [85, 90, 78, 95])
- 348
- 87.0
- 4
- 85
Show answer

87.0 — sum([85,90,78,95]) / len = 348 / 4 = 87.0.

Next lesson: Beginner section exam

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