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lesson:
Exam Statistics / 5. Computing the Average
Please see my programm-code:
grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5] # was given
def grades_sum(scores):
result = 0
for i in scores:
result += i
return result
def grades_averange(grades_input):
factor1 = grades_sum(grades_input)
result = factor1 / float(len(grades_input))
return result
print(grades_averange(grades)) #call of fuction and call to print
Result in console right:
80.4230769231
Given Error:
grades_average seems to be missing!
Can someone give me a advice, what Im doing wrong?
Sometimes an intermediate variable provides clarity concerning the functioning of your algorithm, sometimes it just seems to be clutter. I think it’s less a matter of conciseness than of aesthetics.
If, for instance, you’re going to need to compute many averages, “concise” code might result from defining a function to compute the average (or using numpy, where it’s a built-in), then making use of it whenever needed.
Hi, I’ve been playing around with this ‘computing the average’ code. I’ve written out two ways - one is a lot longer than the other!
I can’t figure out why Example 1 won’t print the correct result though? It prints 3. Examples 2 prints the correct number, 4.5. (Apologies the indents don’t show up but I don’t think that’s the problem!..)
Thanks for your help!
Alex
Example 1:
grades = [5, 4]
def grades_sum(x):
total = 0
for num in x:
total += num
total = total / len(x)
return float(total)
print grades_sum(grades)
prints 3
Example 2:
grades = [5, 4]
def grades_sum(x):
total = 0
for num in x:
total += num
return float(total)
def grades_received(x):
return float(len(x))
def avg(a, b):
total = grades_sum(grades) / grades_received(grades)
return float(total)
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