擅长:python、mysql、java
<pre><code>def avgavg(grade_list):
# Creates the list containing the average grade of all students.
# float() is important or you will only get integers (int / int -> int)
student_avgs = list(float(sum(grades)) / len(grades) for grades in grade_list)
# The global avg is the mean of student_avgs.
global_avg = sum(student_avgs) / len(student_avgs)
print(student_avgs)
print(global_avg)
avgavg([[95, 92, 86], [66, 75, 54], [89, 72, 100], [34, 0, 0]])
</code></pre>