Watch Me Code 1: List Enumeration & Aggregates

In [6]:

    

quizzes = [5,5,4,2,2,4,5,3]


    

In [2]:

    

# definiate loop
for quiz in quizzes:
    print("Grade:", quiz)


    

    




Grade: 5
Grade: 5
Grade: 4
Grade: 2
Grade: 2
Grade: 4
Grade: 5
Grade: 3

In [3]:

    

# definite loop with indexes
print(len(quizzes))
for i in range(len(quizzes)):
    print("Quiz %d Grade: %d" %( i, quizzes[i]))


    

    




8
Quiz 0 Grade: 5
Quiz 1 Grade: 5
Quiz 2 Grade: 4
Quiz 3 Grade: 2
Quiz 4 Grade: 2
Quiz 5 Grade: 4
Quiz 6 Grade: 5
Quiz 7 Grade: 3

In [7]:

    

# indexes
#print(quizzes[0]) # first
#print(quizzes[-1]) # last

print(quizzes)
# mutable
quizzes[1] = 0
print(quizzes)

#slices 
print(quizzes[0:3])
print(quizzes[3:])


    

    




[5, 5, 4, 2, 2, 4, 5, 3]
[5, 0, 4, 2, 2, 4, 5, 3]
[5, 0, 4]
[2, 2, 4, 5, 3]

In [8]:

    

# aggregations
print("Count",len(quizzes))
print("Total", sum(quizzes))
print("Average", sum(quizzes)/len(quizzes))


    

    




Count 8
Total 25
Average 3.125

In [9]:

    

grades = ["A", "B+", "A", "C+", "B-"]
grades[:2]


    

    
Out[9]:





['A', 'B+']

In [10]:

    

print(grades)


    

    




['A', 'B+', 'A', 'C+', 'B-']

In [ ]:

    

grades.append('')