Lesson 7 of 13

Lists

PYTHON

courses = ["SQL", "Python", "ERP"]
print(courses[0], courses[-1], len(courses))
courses.append("Networks")
print(courses)

Indexes start at 0 and -1 is the last item. append adds to the end, remove deletes a value, len gives the count.

PYTHON

grades = [88, 92, 75, 64, 99]
print(max(grades), min(grades), sum(grades) / len(grades))
print(sorted(grades))
print(grades[1:3])

PYTHON

for c in ["SQL", "Python", "ERP"]:
    print("-", c)

A list comprehension builds a new list from an existing one, optionally with a condition:

PYTHON

grades = [88, 92, 75, 64, 99]
passed = [g for g in grades if g >= 70]
curved = [g + 5 for g in grades]
print(passed)
print(curved)

Exercises