CSCI 1360: Foundations for Informatics and Analytics
Reverse the keys and values in a dictionary (make the keys the values, and the values the keys).
I define a child class. Instead of wholesale overriding parent behavior, however, I merely want to augment it. How can I do this without re-implementing code in the parent?
How does Python resolve multiple inheritance collisions? (i.e. methods with the same name in multiple parent classes)
Name the two types of variable scope in Python. Name the three [four] specific environments which determine these scopes.
What does the following code print:
class Vehicle():
def __init__(self, name):
self.name = name
print("I am a {}.".format(self.name))
def drive(self, mileage):
print("I drove {} miles.".format(mileage))
class Car(Vehicle):
def drive(self, mileage, passengers):
print("I have {} passengers.".format(passengers))
super(Car, self).drive(mileage)
class BMW(Car):
def __init__(self, model, year):
self.model = model
self.year = year
super(BMW, self).__init__(model)
bmw = BMW("Roadster", 2016)
bmw.drive(10, 3)
Write a single loop that simultaneously prints three lists which may or may not be the same length.
Flip the type of loop you used in the previous question (if you used a for
loop, use a while
loop here to answer the same thing, and vice versa).
What is "unpacking"? Give an example.
How can you test if a specific value x
is in a list? How can you test if a specific value x
is NOT in a list?
Explain the resulting data structure from the code below. Why would it be useful?
import numpy as np
list1 = np.random.random(10).tolist()
list2 = np.random.randint(100, 10).tolist()
data_structure = enumerate(zip(list1, list2)) # What is this?
Draw and describe a list-of-lists that each contain lists (a 3D "cube").
What happens in the following code?
x = 2
def f(x):
y = x ** 2
x = x ** 2
return y
y = f(x)
x = f(y)
# What is x?
# What is y?
What happens in the following code?
def g(x, y):
x[0] *= x[1]
z = y.copy()
z[0] *= x[1]
return z
x = [1, 2]
y = [3, 4]
x = g(y, x)
# What are x and y?